基于连续损伤力学的高低周复合疲劳损伤
发布时间：2019-03-07 11:28
【摘要】：基于连续损伤力学(CDM)的经典损伤理论和不可逆热力学原理,分别对高周和低周疲劳载荷下的损伤演化模型进行了研究,进而推导出一个新的高低周复合疲劳损伤模型;将该模型编写为UMAT耦合到ABAQUS有限元分析软件中,实现了对缺口材料高低周复合疲劳损伤的模拟及裂纹萌生位置和萌生寿命的预测;同时研究了不同的高低周循环比对裂纹萌生寿命的影响.结果表明,裂纹容易在缺口根部应力集中处萌生;该模型考虑了高低周循环的交互作用,模拟计算结果更符合实际情况;同时通过研究发现高的循环比会使裂纹的萌生加速.
[Abstract]:Based on the classical damage theory and irreversible thermodynamic principle of continuous damage mechanics (CDM), the damage evolution models under high-cycle and low-cycle fatigue loads are studied respectively, and a new high-low-cycle composite fatigue damage model is derived. The model is programmed as UMAT and coupled to ABAQUS finite element analysis software. The simulation of fatigue damage and prediction of crack initiation position and initiation life of notched materials with high and low cycles are realized. At the same time, the influence of high and low cycle ratio on crack initiation life was studied. The results show that the crack initiation is easy to occur at the stress concentration at the notch root; the interaction between high and low cycle cycles is considered in the model, and the simulation results are more consistent with the actual situation; at the same time, it is found that the crack initiation can be accelerated by high cycle ratio.
【作者单位】： 天津大学材料学院;天津市现代连接技术重点实验室;
【基金】：国家自然科学基金资助项目(50975196,50805103)
【分类号】：TB30
，
本文编号：2436076
[Abstract]:Based on the classical damage theory and irreversible thermodynamic principle of continuous damage mechanics (CDM), the damage evolution models under high-cycle and low-cycle fatigue loads are studied respectively, and a new high-low-cycle composite fatigue damage model is derived. The model is programmed as UMAT and coupled to ABAQUS finite element analysis software. The simulation of fatigue damage and prediction of crack initiation position and initiation life of notched materials with high and low cycles are realized. At the same time, the influence of high and low cycle ratio on crack initiation life was studied. The results show that the crack initiation is easy to occur at the stress concentration at the notch root; the interaction between high and low cycle cycles is considered in the model, and the simulation results are more consistent with the actual situation; at the same time, it is found that the crack initiation can be accelerated by high cycle ratio.
【作者单位】： 天津大学材料学院;天津市现代连接技术重点实验室;
【基金】：国家自然科学基金资助项目(50975196,50805103)
【分类号】：TB30
，
本文编号：2436076
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