缺口件局部应力-应变关系影响因素的研究  

Influencing factors on local stress-strain responses of notched specimen

作　　者：张莉[1] 赵兵[1] 程靳[1] 

机构地区：[1]哈尔滨工业大学航天科学与力学系,哈尔滨150001

出　　处：《哈尔滨工业大学学报》2009年第1期31-33,共3页Journal of Harbin Institute of Technology

基　　金：黑龙江省自然科学基金资助项目(A10-01);黑龙江省博士后基金资助项目

摘　　要：为了分析缺口件局部应力-应变关系的影响因素,利用有限元方法对多轴循环载荷下的中心圆孔缺口试件进行了弹塑性有限元分析,讨论了应力幅、平均应力以及多轴性对缺口部位局部应力-应变关系的影响.结果表明:正应力幅和多轴载荷影响迟滞回线的形状,表征着材料的损伤,是疲劳分析中的重要因素;平均应力不影响迟滞回线的面积,对损伤没有影响,它主要影响迟滞回线中心的位置,在疲劳分析中须引入平均应力修正.To analyze the influencing factors on local stress-strain responses of notched specimen, an elasticplastic finite element analysis is presented for a solid cylindrical specimen with transverse circular hole subjected to muhiaxial cyclic loading. Effects of the stress amplitude, the mean-stress and the muhiaxiality On local stress-strain responses are discussed. It is shown that the stress amplitude and multiaxial load influence the shape of the hysteresis loop and characterize the material damage, while the mean-stress influences the location of the center of the stabilized hysteresis loop without effects on damage. So in fatigue analysis the stress amplitude and the muhiaxiality are important factors, and the mean-stress should be introduced to the correction of the prediction model of fatigue life.

关 键 词：缺口件 多轴循环载荷 弹塑性有限元计算 应力-应变关系 

分 类 号：O346.2[理学—固体力学]