Effect of Material Nonlinearity on Progerssive Damage of Laminated Composites
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摘要: 根据Hahn-Tsai非线性应力应变关系,用有限元方法对受拉伸载荷作用的含孔复合材料层板损伤演变进行了模拟计算,由非线性有限元方法得到的应力、应变以及最终载荷与以往线性分析方法得到的结果比较表明:考虑材料非线性可以提高计算精度;参数研究表明非线性系数的变化对正交各向异性板的影响较大,而对准各向同性板的影响较少.Abstract: A nonlinear finite element program in terms of the nonlinear shear stress-shear strain relation proposed by Hahn and Tsai is used to simulate the progressive damage of laminated composites with a circulor hole subjected to remote tensile loading.Stress,strain and ultimate strength of laminates are analyzed by this program.Compared with the experimental data in earlier paper,the nonlinear approch is more accurate than the linear approach,especially for orthotropic laminate.The parametric study manifests that the variance of nonlinearity coefficient has more serious effect on orthotropic plate than on quasi-isotropic plate.
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Key words:
- non-linear /
- composite materials /
- finite elements /
- damage
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1. Hahn H T,Tsai S W.Nonlinear behaviour of composite materials. J Composite Materal,1973,7:102~118 2. 华 玉.损伤复合材料层合板本构关系研究与破坏过程模拟:[学位论文].北京:北京航空航天大学飞行器设计与应用力学系,1994 3. Tan S C.A progressive failure model for composite laminates containing openings. J Composite Materal,1991,25:556~577 4. Chang K Y,Liu S,Chang F K.Damage tolerance of laminated composites containing an open hole and subjected to tensile loadings.J Composite Materal,1991,25:274~301 -
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