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采用有限元方法(Finite Element Method)对环氧树脂/聚氨酯(EP/PU)梯度材料在制备过程中产生的残余热应力进行了分析。详细讨论了梯度层数目对应力大小的影响。研究结果表明:当体系中EP和PU组成相同时,梯度材料缓和热应力的效果比双层材料显著。且梯度材料的热应力缓和效果随梯度层数增加而增加。
Residual thermal stress in the preparation of epoxy / polyurethane (EP / PU) graded materials was analyzed by finite element method (Finite Element Method). The influence of the number of gradient layers on the magnitude of stress is discussed in detail. The results show that when the composition of EP and PU are the same, the effect of gradient material on thermal stress relaxation is more significant than that of double layer material. And the thermal stress relaxation effect of the gradient material increases with the number of gradient layers.