Constitutive relations of thermosetting resin during curing process and their applications of estimating internal stresses

根据不同温度条件下的粘弹性变形和体积收缩实验结果，建立了热固性树脂固化过程中的本构关系。利用建立的本构关系分析了固化过程中树脂模型的内应力.热固性树脂固化过程中的材料性能（1）实验测定了不同温度条件下固化过程中的体积收缩率。(2)高温固化导致收缩迅速且收缩幅度大.热固性树脂固化过程中的本构关系（1）实验测量了不同温度条件下固化过程中的蠕变变形。(2)采用非线性粘弹模型对试验蠕变变形进行了计算.树脂模型内应力的估算（1）树脂-金属双层复合材料模型在高温固化过程中产生较大的内应力。(2)粘弹性分析得到了比弹性分析更好的结果估计的热变形的模型。(3)与均匀温度条件相比，非均匀温度分布会导致模腔树脂块产生较大的内应力。

Constitutive relations of thermosetting resin during curing process were formulated on the basis of experimental results of viscoelastic deformation and volume shrinkage for various temperature conditions. Internal stress of resin models induced by curing process were analyzed using formulated constitutive relations.1. Material properties of thermosetting resin during curing process(1) Volume shrinkages were experimentally measured during curing process under various temperature conditions.(2) High temperature curing resulted in rapid and large shrinkage.2. Constitutive relations of thermosetting resin during curing process(1) Creep deformations were experimentally measured during curing processes under various temperature conditions.(2) Experimental creep deformations were formulated by using non-linear viscoelastic models.3. Estimation of internal stress of resin models(1) Large internal stresses were induced by high temperature curing for two-layered composite models of the resin and metal plate.(2) Viscoelastic analysis gave better results than elastic analysis for the estimation of thermal deformation of the model.(3) Non-uniform temperature distribution induced large internal stresses for the resin n block of molding cavity comparing uniform temperature conditions.