湿-热-力耦合环境下复合材料结构损伤分析与性能研究

Damage analysis and strength prediction of composites structures in hygrothermal environment

将考虑湿热效应的经典层合板理论引入有限元方法中,通过精确考察单层板等效参数衰减、追踪初始破坏后的卸载以及对最终破坏进行判定,在精确预测湿热环境对复合材料性能影响的同时追踪了损伤演化过程。通过建立湿-热-力耦合下复合材料宏观性能的定量表达式,发展湿-热-力耦合环境下复合材料性能演化表征与预测方法,实现在有限元分析中考虑湿热效应的影响。对3种不同铺层方式复合材料层合板进行湿热环境试验研究,并利用本文中分析方法进行损伤模拟,分析结果与实验结果符合得较好。

By means of the introduction of the classic laminate theory with considering hygrothermal effect into the finite element method,the mechanical properties of composite in hygrothermal environment were accurately forecasted and the damage evolution was tracked through careful consideration of equivalent lamina parameters reduction and unloading after initial damage and estimation of final damage.The tensile and compressive strengths of three different lay-up composite laminates in hygrothermal environment were studied.There is good agreement between experiment and simulation results.