A method to analyze the axially symmetric problem of composite thick tubes with arbitrary angles
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摘要: 提出了一种任意角度复合材料厚壁管的轴对称问题的分析方法。传统的Lekhnitskii理论能够获得普通缠绕层复合材料厚壁管的精确弹性解,但是,当厚壁管内存在0°缠绕层或者各项同性材料层时,该两种特殊层都会出现奇异参数,从而导致特殊层与普通层界面的连续性条件不能被满足。因此,讨论了特殊层存在奇异参数的原因,并对这类参数进行连续性分析和极限计算,从而解决了参数奇异的问题,使Lekhnitskii理论的应用范围扩展到任意缠绕角的复合材料厚壁管。最后,通过有限元计算软件ABAQUS分析了不同复合材料组合管的力学响应,有限元计算结果与改进理论结果基本一致。Abstract: A method was proposed to analysis the axisymmetric problem of composite tubes made up of winding layers with arbitrary angles. The traditional Lekhnitskii theory can obtain the exact elastic solution of the thick composite tubes with common winding layers. However, when there are 0° winding layers or isotropic layers in the thick walled tubes, singular parameters will appear in the both special layers. And the discontinuity condition between the special layer and the common layer could not be satisfied. Therefore, the reasons for the existence of singular parameters in special layers were discussed. Then, the continuity analysis and limit calculation of these parameters were carried out, so that the problem of parameter singularity was solved and the application of Lekhnitskii theory was extended to composite thick tubes with arbitrary angles. Finally, the mechanical responses of different compo-site tubes were analyzed by ABAQUS, and the results of finite element calculation were basically consistent with the developed theoretical results.
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Key words:
- composite material /
- axisymmetric problem /
- winding angles /
- thick tubes /
- theoretical analysis
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图 1 轴对称载荷作用下的复合材料厚壁管
Figure 1. Composite tube subjected to axisymmetric loads
P, T, pi and po—Axial load, torque, internal pressure and outer pressure, respectively; r0 and rN—Internal radius and outer radius of the composite thick tube; rn and φn—Outer radius and winding angle of the nth layer; σZ—Axial stress component; σr, σθ and τrθ—Stress components parallel to the cross section; τθZ and τrZ—Stress components perpendicular to the cross section
表 1 各层材料的力学性能参数
Table 1. Material property for each layer
Carbon fiber/epoxy-resin E1=155 GPa, E2=E3=12.1 GPa; v12=v13=0.248; v23=0.458; G12=G13=4.4 GPa; G23=3.2 GPa Glass fiber/epoxy-resin E1=60 GPa, E2=E3=11 GPa;
v12 = v13=0.26; v23=0.4; G12=G13=7.6 GPa; G23=3.7 GPaSteel E=210 GPa;v=0.3 Notes: E1, E2, E3—Modulus in fiber direction, in-plane transverse modulus and out-of-plane transverse modulus respectively; ν12, G12—Poisson's ratio and shear modulus of fiber direction and in-plane transverse direction; ν13 and G13—Poisson's ratio and shear modulus of fiber direction and out-of-plane transverse direction; ν23 and G23—Poisson's ratio, shear modulus of in-plane transverse direction and out-of-plane transverse direction; E and v—Modulus and poisson’s ratio of the steel. -
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