含面内波纹缺陷的复合材料层合板刚度性能

Stiffness of composite laminates with in-plane waviness defect

基于经典层合板理论(CLT),并考虑面内波纹引起的拉伸-弯曲耦合作用,提出了含面内波纹缺陷的复合材料层合板刚度预测模型,定量研究了波纹比、纤维偏转角和波纹位置等面内波纹参数对其三维刚度性能的影响。结果表明:理论模型预测值与文献中的结果吻合较好;面内波纹对纵向弹性模量、横向弹性模量、面内剪切模量、主泊松比和面内弯曲刚度均产生了显著影响。该建模方法为研究波纹缺陷对复合材料力学性能影响提供了参考。

By using the classical lamination theory（CLT） and considering the coupling effect of tension and bending,an analytical model of stiffness prediction was developed for composite laminates with in-plane waviness.The influence of the parameters associated with in-plane waviness such as the waviness ration,the fiber off-axis angle and the waviness position on the 3D stiffness of the laminates was investigated quantitatively.It is found that the theoretical predictions agree well with the results in literature.And the longitudinal elastic modulus,the transverse elastic modulus,the in-plane shear modulus,the major Poisson＇s ratio,and the in-plane bending stiffness are greatly affected by the waviness defect.The approach established provides a procedure to evaluate the effects of waviness defect on the mechanical properties of composite laminates.