作　　者： ; ; ;

机构地区： 太原理工大学

出　　处： 《中北大学学报（自然科学版）》 2007年第5期390-393,共4页

摘　　要： 采用连续损伤力学方法,在著名的王-楼模型的基础上,充分考虑了高分子材料的循环软化特性,得到了高分子材料三轴应力场中的低周疲劳损伤模型.由该模型可知:应力控制的低周疲劳中,循环软化现象表现为平均应变随循环数增加而增加,材料的损伤包括循环塑性损伤和由随循环数增加的平均应变引起的蠕变损伤,同时得到了三轴应力场中的疲劳失效准则和损伤演化方程. Based on Wang-Lou＇s model, a method of continuous damage mechanics is used to get the low cycle fatigue damage model of polymers under triaxiality stresses with the consideration of the cyclic softening of polymer. According to the model, the phenomena of cyclic softening manifests that mean strain is increased with the increasing of the number of cycles in the low cycle fatigue under the stress control. Low cyclic fatigue damage consists of the cyclic plastic damage and the creep damage caused by the mean strain as a result of the increasing of the number of cycles. Fatigue failure criterion and damage evolution equation describing the effect of triaxial stress constraint are obtained.

关 键 词： 高分子材料 疲劳 损伤模型 三轴应力约束 循环软化 循环蠕变 应力控制

领　　域： [一般工业技术] [理学] [理学]