A Viscoelastic Model for Predicting Isotropic Residual Stresses in Thermosetting Materials: Effects of Processing Parameters:
A Viscoelastic Model for Predicting Isotropic Residual Stresses in Thermosetting Materials: Effects of Processing Parameters:
复制标题
DOI：
10.1106/d0jj-v6q1-891m-3gjr
复制
发表时间：
2001-05
影响因子：
2.9
通讯作者：
Patricia Prasatya;G. McKenna;S. Simon
中科院分区：
文献类型：
--
作者：
Patricia Prasatya;G. McKenna;S. Simon
复合材料中受到三维约束的各向同性残余应力是通过扩展 Simon 等人先前开发的热粘弹性模型来计算的。 [1] 描述商业热固性材料在固化过程中剪切模量与时间、温度和转化率的关系。作为固化时间函数的实验残余应力数据适合于获得橡胶状和玻璃状体积模量的极限值。然后，通过使用体积模量、固化动力学模型、T g 与转化率之间的关系以及热粘弹性模型中获得的应力松弛函数（包括位移因子对温度和转化率的依赖性）进行模拟，研究固化历史对各向同性残余应力的影响。在固化过程中不发生玻璃化的情况下，室温下的各向同性残余应力可以与发生凝胶化的固化温度直接相关。
The isotropic residual stresses in a composite subjected to three-dimensional constraints are calculated by extending a thermo-viscoelastic model developed previously by Simon et al. [1] to describe the time, temperature, and conversion dependence of the shear modulus for a commercial thermosetting material during cure. Experimental residual stress data as a function of cure time are fit to obtain limiting values for the rubbery and glassy bulk moduli. The effects of cure history on isotropic residual stresses are then investigated via simulations using the bulk moduli, a model of the cure kinetics, the relationship beween T g and conversion, and the stress relaxation function obtained in the thermo-viscoelastic model which includes the dependence of the shift factor on temperature and conversion. The isotropic residual stresses at room temperature can be directly related to the cure temperature at which gelation occurred for cases when vitrification does not occur during cure.