摘要
疲劳破坏是金属最常见的失效形式之一.基于连续损伤力学理论和能量原理,论文提出了一个修正的金属材料低周疲劳损伤演化方程,该方程综合考虑了材料的塑性强化、微裂纹闭合效应等因素对损伤累积的影响.将修正后的损伤演化方程以UMAT子程序的形式导入有限元计算软件ABAQUS之中,建立了疲劳损伤的计算模型,并以铝合金7050-T7451为例对该模型的有效性和适用性进行了验证.
Fatigue failure is one of the most common failure modes of metal materials and structures. In this paper,a modified low cycle fatigue damage law is presented, based on the continuum damage me-chanics and energy principle,which takes the effects of plastic hardening and micro-defects closure on dam- age evolution into account. To predict the fatigue failure of metal materials, the modified damage model is incorporated into the commercial finite element platform ABAQUS/Explicit through a user material sub-routine UMAT. In addition,the validity and applicability of this model are examined by comparing the nu-merical results with the experimental data of aluminum alloy 7050-T7451.
出处
《固体力学学报》
CAS
CSCD
北大核心
2013年第6期571-578,共8页
Chinese Journal of Solid Mechanics
基金
国家自然基金项目(51375386)资助
