摘要
复合材料的损伤和破坏行为是相当复杂的,为了描述在复杂载荷条件下的材料的力学行为,可采用损伤与裂纹面间由摩擦诱导的塑性相结合的研究方法。在现有的复合材料摩擦塑性与损伤的耦合模型的基础上,在平面应力条件下,考虑了剪切应变对损伤能释放率的影响,适当地修正了损伤演化方程,从而建立了一种改进的复合材料损伤与摩擦塑性耦合模型。通过算例讨论了复合材料层板在复杂载荷作用下的力学行为,计算结果不仅反映了材料在加卸载过程中的剪切滞回现象,又反映了材料在一个加卸载循环内损伤值增加的实际情况,并且计算结果对应的理论曲线与试验曲线符合得很好。这种改进的模型除了可以解决复合材料的复杂加载问题,还可推广到材料的疲劳损伤的研究中。
The behavior of damage and failure for composites is very complex.In order to describe the mechanical behavior of materials in complex loading conditions,the method of damage coupling with friction-induced plasticity can be used.Based on the existing damage coupling with plasticity model for composites under plane stress,considering the effect of damage energy release rate caused by strain,and improving the damage evolution laws,a modified coupling model is established.The mechanical behavior under complex load is studied and the calculated results show not only the shear hysteresis phenomenon,but also the situation of an increasing damage in a loading and unloading loop,and the theoretical curve according well with the experimental ones.In addition to solve the problem of complex loading,the modified model can also be extended to the study of fatigue damage.
出处
《沈阳师范大学学报（自然科学版）》
CAS
2011年第1期40-43,共4页
Journal of Shenyang Normal University:Natural Science Edition
基金
辽宁省高等学校科学研究计划项目(2008685)
沈阳师范大学博士科研启动基金资助项目(054-55440104013)
关键词
复合材料
损伤
摩擦塑性
损伤能释放率
composites
damage
friction-induced plasticity
damage energy release rate
