1999 Vol. 16, No. 3
1999, 16(3): 1-6.
Abstract:
Linear elastic fracture mechanics and acoustic emission were used to monitor the interfacial failure toughness GIC and the resistance crack growth R of rubber/composites for specimen double cantilever sandwich in mode I. It was shown that GIC decreased as the temperature increased. It was also shown that GIC increased as rubber thickness and loading rate increased.
Linear elastic fracture mechanics and acoustic emission were used to monitor the interfacial failure toughness GIC and the resistance crack growth R of rubber/composites for specimen double cantilever sandwich in mode I. It was shown that GIC decreased as the temperature increased. It was also shown that GIC increased as rubber thickness and loading rate increased.
1999, 16(3): 7-11.
Abstract:
The manufacturing process of the high density bonded NdFeB permanent magnet which consists of nylon1010 and rapidly quenching NdFeB powder has been studied, and its effects on the magnetic properties of bonded NdFeB magnet have also been investigated. The results show that the surface state of rapidly quenching NdFeB powder, the mixing process, in which NdFeB powder and nylon1010 are mixed uniformly, and the hot press process of bonded NdFeB magnet affect obviously the magnet properties of the nylon1010 bonded NdFeB permanent magnet. The magnetic properties of bonded NdFeB magnet with NdFeB powder, which is treated to have higher oxidation resistance are much higher than those with nontreated NdFeB powder. Only in a mixing process of NdFeB powder and nylon1010 on the doubleaxes mixing machine when nylon1010 is in a halfmelting state and the mixing time is shorter, can the permanent magnetic properties of bonded NdFeB can higher. The hot pressing temperature and pressure affect more obviously on the magnetic properties than the pressing time does.
The manufacturing process of the high density bonded NdFeB permanent magnet which consists of nylon1010 and rapidly quenching NdFeB powder has been studied, and its effects on the magnetic properties of bonded NdFeB magnet have also been investigated. The results show that the surface state of rapidly quenching NdFeB powder, the mixing process, in which NdFeB powder and nylon1010 are mixed uniformly, and the hot press process of bonded NdFeB magnet affect obviously the magnet properties of the nylon1010 bonded NdFeB permanent magnet. The magnetic properties of bonded NdFeB magnet with NdFeB powder, which is treated to have higher oxidation resistance are much higher than those with nontreated NdFeB powder. Only in a mixing process of NdFeB powder and nylon1010 on the doubleaxes mixing machine when nylon1010 is in a halfmelting state and the mixing time is shorter, can the permanent magnetic properties of bonded NdFeB can higher. The hot pressing temperature and pressure affect more obviously on the magnetic properties than the pressing time does.
1999, 16(3): 12-18.
Abstract:
Heat analysis of PTFE resin and glass reinforced PTFE was completed and the basic manufacturing process parameters were assured. In terms of the requirements of characteristics of highspeed broadband missile radome outlayer, the tensile strength and dielectric properties were investigated. The results showed that about 11% (weight fabrication) chopped fiber or 37% glass cloth reinforcing PTFE had the highest tensile strength and acceptable dielectric properties. Crystallizing phenomenon of PTFE was discovered easily with the adding of some particles. Finally, prediction of dielectric properties was discussed.
Heat analysis of PTFE resin and glass reinforced PTFE was completed and the basic manufacturing process parameters were assured. In terms of the requirements of characteristics of highspeed broadband missile radome outlayer, the tensile strength and dielectric properties were investigated. The results showed that about 11% (weight fabrication) chopped fiber or 37% glass cloth reinforcing PTFE had the highest tensile strength and acceptable dielectric properties. Crystallizing phenomenon of PTFE was discovered easily with the adding of some particles. Finally, prediction of dielectric properties was discussed.
1999, 16(3): 19-22.
Abstract:
The results of a systematic method of toughening, plastic material and thermosetting resin, which included adding inorganic filler, rubber elastomer, plastic material and thermotropic liquid crystal, forming half interpenetrating networks with plastic resin, changing chemical structure of network and controlling the molecular anisotropism of network, and their mechanism were presented. In this paper, the thermodynamic and kinetic data on phase splitting in a system of thermosetting resin modified with rubber elastmer were determined and discussed as well.
The results of a systematic method of toughening, plastic material and thermosetting resin, which included adding inorganic filler, rubber elastomer, plastic material and thermotropic liquid crystal, forming half interpenetrating networks with plastic resin, changing chemical structure of network and controlling the molecular anisotropism of network, and their mechanism were presented. In this paper, the thermodynamic and kinetic data on phase splitting in a system of thermosetting resin modified with rubber elastmer were determined and discussed as well.
1999, 16(3): 23-29.
Abstract:
Cantileverbeam flexural fatigue tests were carried out on plain weave glassfiber reinforced epoxy laminates. The fatigue damage and its growth of the specimens tested were described in detail on a micro scale. Some examples of typical stiffness degradation were presented and discussed as well.
Cantileverbeam flexural fatigue tests were carried out on plain weave glassfiber reinforced epoxy laminates. The fatigue damage and its growth of the specimens tested were described in detail on a micro scale. Some examples of typical stiffness degradation were presented and discussed as well.
1999, 16(3): 30-33.
Abstract:
A trilaminated composite with a steel basis, a transitionlayer of powder copper and a surface layer of POM has been introduced in this essay. The process technology of the trilaminated composites and its influence on the property have been studied. The result shows that, in a certain temperature range, the surface hardness of the products increases with the increasing processing temperature, and decreases with the thickness of the plastic layer increased. Larger composite force of the plastic layer and steel basis, larger surface hardness and less friction coefficient of the products have been shown in larger size of the powder copper.
A trilaminated composite with a steel basis, a transitionlayer of powder copper and a surface layer of POM has been introduced in this essay. The process technology of the trilaminated composites and its influence on the property have been studied. The result shows that, in a certain temperature range, the surface hardness of the products increases with the increasing processing temperature, and decreases with the thickness of the plastic layer increased. Larger composite force of the plastic layer and steel basis, larger surface hardness and less friction coefficient of the products have been shown in larger size of the powder copper.
1999, 16(3): 34-39.
Abstract:
The compatibility of the insitu composite of Polycarbonate(PC) and liquid crystalline copolyester can be improved by adding the multiblock copolymer prepared from PC and LC copolyesteramide oligomer. The mechanical properties of blends are increased when increasing the adding amount of block copolymer. Through the observation of SEM it can be found that the deformation of LC particles can be improved by the block copolymer and the interfacial adhesive becomes better.
The compatibility of the insitu composite of Polycarbonate(PC) and liquid crystalline copolyester can be improved by adding the multiblock copolymer prepared from PC and LC copolyesteramide oligomer. The mechanical properties of blends are increased when increasing the adding amount of block copolymer. Through the observation of SEM it can be found that the deformation of LC particles can be improved by the block copolymer and the interfacial adhesive becomes better.
1999, 16(3): 40-45.
Abstract:
The polypropylenetin (PPSn) nanocomposites were prepared by melt blending PP and Sn. The factors influencing the morphology of PPSn nanocomposites were studied by SEM. The structure of PP crystalline in PPSn composites was measured by WAXD. The processibility, volume resistivity and mechanical properties of PPSn nanocomposites were discussed. The results show that Sn is the nuclearing agents of PP crystallization and can improve notably the processibility of PP. It is found that there exists form crystalline phase structure of PP in PPSn composite. The amount of the form is related to the volume fraction and particle dimension D of Sn. It is also found that the electrically critical volume fractionc of Sn decreases notably with the decrease of D. The complex tensile moduli of PPSn composites increase with the increase of and the decrease of D. The tensile strentgh of PPSn nanocomposites is eleven times as high as that of PP and the izod impact toughness is 3.3 times as high as that of PP.
The polypropylenetin (PPSn) nanocomposites were prepared by melt blending PP and Sn. The factors influencing the morphology of PPSn nanocomposites were studied by SEM. The structure of PP crystalline in PPSn composites was measured by WAXD. The processibility, volume resistivity and mechanical properties of PPSn nanocomposites were discussed. The results show that Sn is the nuclearing agents of PP crystallization and can improve notably the processibility of PP. It is found that there exists form crystalline phase structure of PP in PPSn composite. The amount of the form is related to the volume fraction and particle dimension D of Sn. It is also found that the electrically critical volume fractionc of Sn decreases notably with the decrease of D. The complex tensile moduli of PPSn composites increase with the increase of and the decrease of D. The tensile strentgh of PPSn nanocomposites is eleven times as high as that of PP and the izod impact toughness is 3.3 times as high as that of PP.
1999, 16(3): 46-50.
Abstract:
With the analysis method of the critical fragment length of a single fiber, the interfacial bonding of glass fiber (GF) with polypropylene (PP) is researched. It is found that the interfacial shear strength(ISS) of PP matrix with untreated GF only amounts to 2.75 MPa. However, on the basis of pretreatment of glass fibers with suitable coupling agent,if the fibers are further treated with bismaleimide(BMI), ISS of the composite can be enhanced to 4.42 MPa (increasing by 60%). By blending PP matrix with the anhydride grafted PP (MPP), ISS of the composite can be enhanced to 9.20 MPa (increasing by 233.9 %). With the analysis method,not only can it be accurately determined,whether the interfacial bonding of PP with GF is stronger or weaker,but also can the reliable basis be provided for the design of the final composite.
With the analysis method of the critical fragment length of a single fiber, the interfacial bonding of glass fiber (GF) with polypropylene (PP) is researched. It is found that the interfacial shear strength(ISS) of PP matrix with untreated GF only amounts to 2.75 MPa. However, on the basis of pretreatment of glass fibers with suitable coupling agent,if the fibers are further treated with bismaleimide(BMI), ISS of the composite can be enhanced to 4.42 MPa (increasing by 60%). By blending PP matrix with the anhydride grafted PP (MPP), ISS of the composite can be enhanced to 9.20 MPa (increasing by 233.9 %). With the analysis method,not only can it be accurately determined,whether the interfacial bonding of PP with GF is stronger or weaker,but also can the reliable basis be provided for the design of the final composite.
1999, 16(3): 51-56.
Abstract:
On the basis of the analysis method of the critical fragment length of single fiber, the interfacial shear strength (ISS) of polypropylene (PP) / glass fiber (GF) composites is researched. It is found that adjusting the dosage of anhydride grafted polypropylene (MPP) can effectively change ISS. The interfacial bonding of the composite does not come up to a steady level until the contacting time of the melted PP with the fiber is longer than 810 min. When ISS is smaller than 4 MPa, the interfacial bonding is too weak and the fibers at both sides of the broken point are debonding with the matrix, forming a hollow tube. However, when ISS is higher than 7 MPa, the interfacial bonding is too strong and many cracks form, which lie in the matrix around the broken point of the fiber and in the vertical direction from the fiber axis. The composite becomes brittle. While ISS is among 4 and 7, the interfacial bonding lies in an optimum situation. Not only the debonding at the interface does not generate, but also these crack s ex tending in to mat rix do no t fo rm. The p ropert ies of macro scop ic mechan ics of the compo sites co llaterally conf irm th is argumen t.
On the basis of the analysis method of the critical fragment length of single fiber, the interfacial shear strength (ISS) of polypropylene (PP) / glass fiber (GF) composites is researched. It is found that adjusting the dosage of anhydride grafted polypropylene (MPP) can effectively change ISS. The interfacial bonding of the composite does not come up to a steady level until the contacting time of the melted PP with the fiber is longer than 810 min. When ISS is smaller than 4 MPa, the interfacial bonding is too weak and the fibers at both sides of the broken point are debonding with the matrix, forming a hollow tube. However, when ISS is higher than 7 MPa, the interfacial bonding is too strong and many cracks form, which lie in the matrix around the broken point of the fiber and in the vertical direction from the fiber axis. The composite becomes brittle. While ISS is among 4 and 7, the interfacial bonding lies in an optimum situation. Not only the debonding at the interface does not generate, but also these crack s ex tending in to mat rix do no t fo rm. The p ropert ies of macro scop ic mechan ics of the compo sites co llaterally conf irm th is argumen t.
1999, 16(3): 57-61.
Abstract:
A pressureless permeating method is put forward. Using a prefabricated porous ferroboron lump, a surface composite layer was made on gray cast iron matrix, with a common casting method. The thickness of the surface layer is 8mm; the hardness and microstructure change gradiently. Sliding wear test shows that the wear resistance of the composite surface is higher than that of Cr12 type high chromium cast iron.
A pressureless permeating method is put forward. Using a prefabricated porous ferroboron lump, a surface composite layer was made on gray cast iron matrix, with a common casting method. The thickness of the surface layer is 8mm; the hardness and microstructure change gradiently. Sliding wear test shows that the wear resistance of the composite surface is higher than that of Cr12 type high chromium cast iron.
1999, 16(3): 62-66.
Abstract:
The effect of SiC particulate on the resultant damping behavior of the asspray deposited high silicon alloy ZA27 was investigated in an effort to develop a high damping materials. The high and low frequency internal friction behavior was conducted on Sound Frequency and Multifunctional Internal Friction Apparatus. The experimental results show that the damping capacities of the MMCs reinforced by SiC particulate were improved a lot, and furthermore, hot extrusion improved the damping capacities. Finally, the operative damping mechanisms were discussed in the light of the data obtained from characterization of microstructure based on the theory of Schoeck.
The effect of SiC particulate on the resultant damping behavior of the asspray deposited high silicon alloy ZA27 was investigated in an effort to develop a high damping materials. The high and low frequency internal friction behavior was conducted on Sound Frequency and Multifunctional Internal Friction Apparatus. The experimental results show that the damping capacities of the MMCs reinforced by SiC particulate were improved a lot, and furthermore, hot extrusion improved the damping capacities. Finally, the operative damping mechanisms were discussed in the light of the data obtained from characterization of microstructure based on the theory of Schoeck.
1999, 16(3): 67-72.
Abstract:
The TiC reinforced ZA43 composite was prepared by insitu contactreaction. TiC (0.21.0 m) formed by in situ reaction dispersed homogeneously in matrix alloy. The effect of temperature on in situ reaction and grain refinement mechanisms of TiC/ZA43 have been studied.
The TiC reinforced ZA43 composite was prepared by insitu contactreaction. TiC (0.21.0 m) formed by in situ reaction dispersed homogeneously in matrix alloy. The effect of temperature on in situ reaction and grain refinement mechanisms of TiC/ZA43 have been studied.
1999, 16(3): 73-77.
Abstract:
The mechanical properties and structure of SiC coated fibres by PVD have been investigated. The experimental results show that the amorphous SiC coating has been obtained on carbon fibers, and the coating improves the oxidation resistance of carbon fibers below 700 without decreasing its mechanical properties.
The mechanical properties and structure of SiC coated fibres by PVD have been investigated. The experimental results show that the amorphous SiC coating has been obtained on carbon fibers, and the coating improves the oxidation resistance of carbon fibers below 700 without decreasing its mechanical properties.
1999, 16(3): 78-82.
Abstract:
The reaction dynamic process and structure forming process in SHS of TiCFe system were studied using Combustion Front Quenching method and heat analysis method. It was found in the SHS process of the system that Fe2Ti comolten body was formed first, then carbon dissolved to it in high temperature and reacted with it to form TiCx with higher Ti content. After the main reaction carbon continued to react with TiCx through diffusion and formed the titanium carbide with a close stoichiometric ratio. The flow of molten metals resulted in agglomerates in the preheating zone. In the agglomerates small TiC particles were formed. In the period with high temperature after combustion wave the TiC particles continued growing to a larger size.
The reaction dynamic process and structure forming process in SHS of TiCFe system were studied using Combustion Front Quenching method and heat analysis method. It was found in the SHS process of the system that Fe2Ti comolten body was formed first, then carbon dissolved to it in high temperature and reacted with it to form TiCx with higher Ti content. After the main reaction carbon continued to react with TiCx through diffusion and formed the titanium carbide with a close stoichiometric ratio. The flow of molten metals resulted in agglomerates in the preheating zone. In the agglomerates small TiC particles were formed. In the period with high temperature after combustion wave the TiC particles continued growing to a larger size.
1999, 16(3): 83-86.
Abstract:
The key to prepare uniformly mixed ceramic nanocomposites is that nanophases are dispersed uniformly in matrix. The authors review some new techniques of dispersing and mixing nanophases in matrix.
The key to prepare uniformly mixed ceramic nanocomposites is that nanophases are dispersed uniformly in matrix. The authors review some new techniques of dispersing and mixing nanophases in matrix.
1999, 16(3): 87-92.
Abstract:
The microstructure and properties of two plasma spraying TiCNiMo cermets coatings with different ingredient ratios are studied by XRD, SEM and energy spectrometer. It is presented that in the diffusion bonding mechanism, between hard phase and bonding phase there was a way of Mos diffusion and solid solutizing; and so the (Ti,Mo)C solid clad structure around TiC grain is formed; the bond between hard phase and bonding phase and also the bonding strength of the coatings can be strengthened by controlling properly the thickness of the clad structure.The results show that for spraying compound particles, when the ingredient ratio (wt%) of Ni and TiC is 11, the hardness and bonding strength of the coating are higher than those of the coating of which the ingredient ratio of Ni and TiC is 53.
The microstructure and properties of two plasma spraying TiCNiMo cermets coatings with different ingredient ratios are studied by XRD, SEM and energy spectrometer. It is presented that in the diffusion bonding mechanism, between hard phase and bonding phase there was a way of Mos diffusion and solid solutizing; and so the (Ti,Mo)C solid clad structure around TiC grain is formed; the bond between hard phase and bonding phase and also the bonding strength of the coatings can be strengthened by controlling properly the thickness of the clad structure.The results show that for spraying compound particles, when the ingredient ratio (wt%) of Ni and TiC is 11, the hardness and bonding strength of the coating are higher than those of the coating of which the ingredient ratio of Ni and TiC is 53.
1999, 16(3): 93-97.
Abstract:
General mechanical properties of fibermatrix interface are analyzed by adopting the singlefiber pullout test and the question of interface failure is studied further. Basic equations are established of solving interfacial deformation problems of the fiber and matrix. The general expression of interfacial shear stress is led out. And interfacial failure criterion is set up. This result can reasonably explain the test results in other papers.
General mechanical properties of fibermatrix interface are analyzed by adopting the singlefiber pullout test and the question of interface failure is studied further. Basic equations are established of solving interfacial deformation problems of the fiber and matrix. The general expression of interfacial shear stress is led out. And interfacial failure criterion is set up. This result can reasonably explain the test results in other papers.
1999, 16(3): 98-102.
Abstract:
The state of the art in residual strength of fibrereinforcedplastics(FRP) is reviewed. A new residual strength model based on the damage development in the FRP under fatigue loading is presented, which can macromechanically and phenomenologically describe the characteristics of fatigue damage. Also clearly shown is the good agreement between the experiment data from some quoted literature and the prediction results of this paper.
The state of the art in residual strength of fibrereinforcedplastics(FRP) is reviewed. A new residual strength model based on the damage development in the FRP under fatigue loading is presented, which can macromechanically and phenomenologically describe the characteristics of fatigue damage. Also clearly shown is the good agreement between the experiment data from some quoted literature and the prediction results of this paper.
1999, 16(3): 103-109.
Abstract:
The analyses of melt flow and the prediction of fiber fracture and orientation are tightly related. Therefore an integrated simulation of all the above aspects is necessary. In this paper, based on the analyses of the features of melt flow,fiber fracture and fiber orientation in injection molding, an integrated simulation model is presented. The proposed model can simultaneously simulate the asymmetric melt flow with compressible fluid during the filling and postfilling stages and complex fiber fracture and orientation behaviors induced by melt flow, and couple the melt flow and fiber orientation.
The analyses of melt flow and the prediction of fiber fracture and orientation are tightly related. Therefore an integrated simulation of all the above aspects is necessary. In this paper, based on the analyses of the features of melt flow,fiber fracture and fiber orientation in injection molding, an integrated simulation model is presented. The proposed model can simultaneously simulate the asymmetric melt flow with compressible fluid during the filling and postfilling stages and complex fiber fracture and orientation behaviors induced by melt flow, and couple the melt flow and fiber orientation.
1999, 16(3): 110-117.
Abstract:
The deformation, damage, and failure process in particle filled composite are studied by using a numerical code, MFPA2D, newly developed by CRISR at Northeastern University, Shenyang, P.R.China. Two kinds of particles, rigid and soft with high strength, are considered. The single particle is studied firstly, then multiparticles are modeled. The results from both the single particle model and the multiparticle model show that the failure mechanisms are strongly dependent on the particle stiffness. The simulations reproduce the crack initiation, propagation and coalescence in brittle and heterogeneous matrix. Interactions between the particles are also modeled. The numerical analysis elucidates the effect of the particle stiffness on the anticipated strength and toughness of the matrix.
The deformation, damage, and failure process in particle filled composite are studied by using a numerical code, MFPA2D, newly developed by CRISR at Northeastern University, Shenyang, P.R.China. Two kinds of particles, rigid and soft with high strength, are considered. The single particle is studied firstly, then multiparticles are modeled. The results from both the single particle model and the multiparticle model show that the failure mechanisms are strongly dependent on the particle stiffness. The simulations reproduce the crack initiation, propagation and coalescence in brittle and heterogeneous matrix. Interactions between the particles are also modeled. The numerical analysis elucidates the effect of the particle stiffness on the anticipated strength and toughness of the matrix.
1999, 16(3): 118-123.
Abstract:
The transverse loading state of a laminate with rectangular delaminations is divided using the principle of superposition, so that the problem of delamination can be reduced to the analysis about the additional displacements and stresses which are caused by the additional shear loading acting on the delamination surfaces; then a simple mechanics model about delamination area is established. The laminate sections parallel to the boundary of delamination area can be regarded as laminated beams with delaminations, the displacements of which can be expressed by the analytical solutions of additional displacements in the above beams. By this way, the additional displacement fields satisfying the displacement boundary condition of delamination area can be established. Finally, a closed form solution of additional displacements is obtained by the principle of minimum potential energy. The above results are compared with the convergent solutions obtained by the method of trigonometric series. It shows that
The transverse loading state of a laminate with rectangular delaminations is divided using the principle of superposition, so that the problem of delamination can be reduced to the analysis about the additional displacements and stresses which are caused by the additional shear loading acting on the delamination surfaces; then a simple mechanics model about delamination area is established. The laminate sections parallel to the boundary of delamination area can be regarded as laminated beams with delaminations, the displacements of which can be expressed by the analytical solutions of additional displacements in the above beams. By this way, the additional displacement fields satisfying the displacement boundary condition of delamination area can be established. Finally, a closed form solution of additional displacements is obtained by the principle of minimum potential energy. The above results are compared with the convergent solutions obtained by the method of trigonometric series. It shows that
1999, 16(3): 124-128.
Abstract:
Applying the theory of plate and beam on elastic foundation to analyzing honeycomb structure, this paper gives transformation of the plate and the stress distribution in the honeycomb core, and establishes the defect tolerance of honeycomb structure.
Applying the theory of plate and beam on elastic foundation to analyzing honeycomb structure, this paper gives transformation of the plate and the stress distribution in the honeycomb core, and establishes the defect tolerance of honeycomb structure.
1999, 16(3): 129-134.
Abstract:
The tensile experiments have been done for the 4D(fourdirection) and 5D (fivedirection) braided composites. Their mechanical properties are investigated from the macroscopic view and some principal mechanical properties as well as thier deformational characteristics are obtained at the same time. On the basis of tensile experiments, the SEM analyses of tensile broken specimens have been conducted. The failure mechanism of braided composites is discussed from the microscopic view, by which some important conclusions are drawn. These results can provide an experimental basis for further studies on failure problems of braided composites.
The tensile experiments have been done for the 4D(fourdirection) and 5D (fivedirection) braided composites. Their mechanical properties are investigated from the macroscopic view and some principal mechanical properties as well as thier deformational characteristics are obtained at the same time. On the basis of tensile experiments, the SEM analyses of tensile broken specimens have been conducted. The failure mechanism of braided composites is discussed from the microscopic view, by which some important conclusions are drawn. These results can provide an experimental basis for further studies on failure problems of braided composites.
1999, 16(3): 135-139.
Abstract:
Since threedimension multidirectional braided composites have many advantages which can not be substituted, it is called reinforcedfiber composites of the third generation. In this paper, the unit cell model is established and verified for fourdirectional braided composites. The experimental data agree very well with the results predicted by the theoretical analysis. The effectiveness of the present model becomes the basis of properties analysis and optimum design of threedimensional braided composites.
Since threedimension multidirectional braided composites have many advantages which can not be substituted, it is called reinforcedfiber composites of the third generation. In this paper, the unit cell model is established and verified for fourdirectional braided composites. The experimental data agree very well with the results predicted by the theoretical analysis. The effectiveness of the present model becomes the basis of properties analysis and optimum design of threedimensional braided composites.
1999, 16(3): 140-146.
Abstract:
The buckling analysis of symmetrically laminated composite plates loaded in compression and shear is presented by using the pb-2 Ritz functions, which consist of the product of a basic function and a two dimensional polynomial function. The outplane shear deformation is also taken into consideration in this analysis. It is shown that the convergence of solutions for the buckling load is good when the number of polynomials is more than 20. Numerical results are obtained for symmetrical angle-ply laminated composite plates. The effects of material properties, plate aspect ratio, number of layers and lamination angle on buckling load are also investigated under simple supported, clamped edges and combined edge conditions. It is shown that the presented method considering the outofplane shear deformation can be widely used to analyze the buckling behavior of composite plates with general boundary conditions.
The buckling analysis of symmetrically laminated composite plates loaded in compression and shear is presented by using the pb-2 Ritz functions, which consist of the product of a basic function and a two dimensional polynomial function. The outplane shear deformation is also taken into consideration in this analysis. It is shown that the convergence of solutions for the buckling load is good when the number of polynomials is more than 20. Numerical results are obtained for symmetrical angle-ply laminated composite plates. The effects of material properties, plate aspect ratio, number of layers and lamination angle on buckling load are also investigated under simple supported, clamped edges and combined edge conditions. It is shown that the presented method considering the outofplane shear deformation can be widely used to analyze the buckling behavior of composite plates with general boundary conditions.
