基于Jones-Nelson本构模型的C/C复合材料喉衬变形研究

摘要

引入了应力-应变关系扩充理论和加权柔度修正理论,修正了Jones-Nelson本构模型,建立了基于Jones-Nelson模型的C/C复合材料本构关系,使得该模型可在考虑材料各向异性、拉压双模量、损伤演化特征的情况下,用于表征任意拉压混合载荷作用下的多向编织C/C复合材料的力学性能.在此基础上,进行了C/C复合材料喉衬变形研究,同时展开了喉衬应变场的测试.结果表明,考虑Jones-Nelson模型的计算结果和测试结果更吻合.%Imports the extension theory of stress-strain relation and weighted slenderness theory,modifies Jones-Nelson constitutive model,establishes the constitutive relationship of carbon/carbon composites based on the Jones-Nelson model,to express the material elastic constants accurately in any tension and compression of mixed loading.Based on the study,analyzes the distortion of the C/C composites throat,texted on the throat strain field at the same time.The results show that the simulation results which considering the Jones-Nelson model coincide to the experiment results.