1986 Vol. 3, No. 1
1986, 3(1): 1-Ⅰ.
Abstract:
By making use of the variational analvsis, the preseat paper decives the analytical expressions of sensitivity of structural responses such as struetural compliance under statie loading,natural vibration frequeney and buckling load of symmetrically laminated plates with respect to the fiber's orientation of the inlivilual layers.
By making use of the variational analvsis, the preseat paper decives the analytical expressions of sensitivity of structural responses such as struetural compliance under statie loading,natural vibration frequeney and buckling load of symmetrically laminated plates with respect to the fiber's orientation of the inlivilual layers.
1986, 3(1): 11-Ⅱ.
Abstract:
The failure process in carbon fiber reinforces aluminium composite (C/Al) has been investigated by estimating tensile strength and acoustic emission behavior during loading combined with the analysis of the fracture morphology.The test specimens are cut from C/Al composite plates which have been prepared by using the diffusion bonding technique in air. Actnal dimensions of the specimens are 100 mm in length,6mm in width and 2~3 mm in thickness.
The failure process in carbon fiber reinforces aluminium composite (C/Al) has been investigated by estimating tensile strength and acoustic emission behavior during loading combined with the analysis of the fracture morphology.The test specimens are cut from C/Al composite plates which have been prepared by using the diffusion bonding technique in air. Actnal dimensions of the specimens are 100 mm in length,6mm in width and 2~3 mm in thickness.
1986, 3(1): 18-Ⅲ.
Abstract:
The present paper provides a theoretical proof for that the natural frepuency of laminated plate under lateral load can be reduced and the deflection of the plate increased by the coupling between bending and extension.The expressions of the natural frequency and deflection under lateral load for laminates have been derived.It is proved that the expressions of both the natural frequency and the deflection consist of two terms.The first term which is as the same as corresponding expression of symmetrical laminate is positive and the second term negative,which is the influence of the coupling between beetling and extension.The laminates which give the highest natural freuluencv and the lowowest deflection are found to he symmetrical laminates from optimum analysis of laminates.
The present paper provides a theoretical proof for that the natural frepuency of laminated plate under lateral load can be reduced and the deflection of the plate increased by the coupling between bending and extension.The expressions of the natural frequency and deflection under lateral load for laminates have been derived.It is proved that the expressions of both the natural frequency and the deflection consist of two terms.The first term which is as the same as corresponding expression of symmetrical laminate is positive and the second term negative,which is the influence of the coupling between beetling and extension.The laminates which give the highest natural freuluencv and the lowowest deflection are found to he symmetrical laminates from optimum analysis of laminates.
1986, 3(1): 25-Ⅳ.
Abstract:
The curing reaction of epoxy resin has been stndied by means of N-Rray Photoelectron Spectroscopy (NPS).The relations between the degree of cure temperature as well as curing time are obtained.
The curing reaction of epoxy resin has been stndied by means of N-Rray Photoelectron Spectroscopy (NPS).The relations between the degree of cure temperature as well as curing time are obtained.
1986, 3(1): 30-Ⅴ.
Abstract:
In order to enlarge microscope's availability and its microimage contrast,some special microtechniques including dark-field,polarizing light,differential interference coutrast (DIC) Methods are used herein.
In order to enlarge microscope's availability and its microimage contrast,some special microtechniques including dark-field,polarizing light,differential interference coutrast (DIC) Methods are used herein.
1986, 3(1): 36-Ⅴ.
Abstract:
In order to study the structures and properties of polymeric composite materials by ellopsonmetry techniques,the first important thing is to derive and analyze the equations of ellipsometry and select the adequate experimental parameters frm the poine of view of polymetric materials.
In order to study the structures and properties of polymeric composite materials by ellopsonmetry techniques,the first important thing is to derive and analyze the equations of ellipsometry and select the adequate experimental parameters frm the poine of view of polymetric materials.
1986, 3(1): 45-Ⅵ.
Abstract:
The governing differential equations of composite.Jaminate are obtained by evpanding the in-plane normal stresses into a series along the thickness of plate and applying the complementary energy method.The solution of these equations yields the distribution of interlaminar stresses.
The governing differential equations of composite.Jaminate are obtained by evpanding the in-plane normal stresses into a series along the thickness of plate and applying the complementary energy method.The solution of these equations yields the distribution of interlaminar stresses.
1986, 3(1): 54-Ⅵ.
Abstract:
In principle,the equations given in the paper can be applied to any kind of windable geometric surface and any determined way of motion of the fiber feed.The equations deal with concepts of "falling point stabilizaton" and "supporting point stabizaton".
In principle,the equations given in the paper can be applied to any kind of windable geometric surface and any determined way of motion of the fiber feed.The equations deal with concepts of "falling point stabilizaton" and "supporting point stabizaton".
1986, 3(1): 61-Ⅶ.
Abstract:
In this paper, a "unified" ply optimization modle for in-plane laminates based or minimum strain energy criterion is built up, with the in-plane laminated element as structure modle whose main elastic axie coincids with its main orientattion of stress resultant, average strain energy density as the object function,the lamina fraction and fiber angle of lamina as design variables and materilas properties and total fraction of each kind of materials (for hybrid laminates) being given as the restrictions.
In this paper, a "unified" ply optimization modle for in-plane laminates based or minimum strain energy criterion is built up, with the in-plane laminated element as structure modle whose main elastic axie coincids with its main orientattion of stress resultant, average strain energy density as the object function,the lamina fraction and fiber angle of lamina as design variables and materilas properties and total fraction of each kind of materials (for hybrid laminates) being given as the restrictions.
1986, 3(1): 70-Ⅸ.
Abstract:
The deyendenne of the uniaxial critical load for simply supported rectangular nmlti-ply laminated platos ou the state of their laminated layers is analyzed and explained.To increase the critical load of the plate the best form of lamination is indicated.Lamination angles corresponding to the maximum critical loads given in the calculated examples of this paper agree well with what is in Ref.[3]where the optimality criteria is used.
The deyendenne of the uniaxial critical load for simply supported rectangular nmlti-ply laminated platos ou the state of their laminated layers is analyzed and explained.To increase the critical load of the plate the best form of lamination is indicated.Lamination angles corresponding to the maximum critical loads given in the calculated examples of this paper agree well with what is in Ref.[3]where the optimality criteria is used.
1986, 3(1): 74-Ⅸ.
Abstract:
The analysis for room-temperture shape of unsymmetric laminates after high-temperture curing is significant for design and manufacturing of composite materials.Hyer first calculated this room-te-mpertnre shape by using minimum potential energy theorem and large deflection theory of thin plate,but his calculation method is too compplex to be used in engineering.
The analysis for room-temperture shape of unsymmetric laminates after high-temperture curing is significant for design and manufacturing of composite materials.Hyer first calculated this room-te-mpertnre shape by using minimum potential energy theorem and large deflection theory of thin plate,but his calculation method is too compplex to be used in engineering.
1986, 3(1): 80-Ⅹ.
Abstract:
Creep and relaxation phenomena were observed in the bending tests of piye line svstem made of chopped strand mat glass fibre reinforced polyesler (CSbI-GRP).In order to characterize the relaxation behaviour of this kind of material,the experimental study on relaxation behaviour of three point-bending beam was carried out.
Creep and relaxation phenomena were observed in the bending tests of piye line svstem made of chopped strand mat glass fibre reinforced polyesler (CSbI-GRP).In order to characterize the relaxation behaviour of this kind of material,the experimental study on relaxation behaviour of three point-bending beam was carried out.
1986, 3(1): 89-Ⅹ.
Abstract:
In this paper, a series of mechanical problems of structures for composite materials related to the design, manufacture and application are discussed. It is expected to cause the more attention of engineers and researchers,so as to promote a greater progress in the works of design,research and manufacture of composite structures in China.
In this paper, a series of mechanical problems of structures for composite materials related to the design, manufacture and application are discussed. It is expected to cause the more attention of engineers and researchers,so as to promote a greater progress in the works of design,research and manufacture of composite structures in China.
