High Cycle Fatigue Life Prediction based on Extended Space-time Finite Element Method
讲座名称：
High Cycle Fatigue Life Prediction based on Extended Space-time Finite Element Method
讲座时间：
2015-06-24
讲座人：
Dong Qian
形式：
校区：
兴庆校区
实践学分：
讲座内容：
机械结构强度与振动国家重点实验室、国际应用力学中心学术系列讲座
报告： High Cycle Fatigue Life Prediction based on Extended Space-time Finite Element Method
报告人： Dong Qian 教授
讲座时间：10:00am, 2015-06-24
讲座地点: 教一楼南二层第二会议室
报告主持: 刘子顺教授
讲座摘要：High Cycle Fatigue Life Prediction based on Extended Space-time Finite Element Method
Safe-life and damage-tolerance approaches have been widely used for fatigue life predictions of many industrial applications. However, these methods have some limitations due to their empirical nature. Finite element method based on semi-discrete approaches, currently used for simulating the structural response under dynamic conditions, has time-step limitations making HCF simulation an elusive task. Motivated by this critical gap, an extended space-time method (XTFEM) based on the time discontinuous Galerkin formulation [1, 2] is proposed to handle the time-scale issues in fatigue problems. This method is stable for any large time-step and accurately handles high frequency loadings. Advantages of our XTFEM in handling practical fatigue loading histories over semi-discrete methods are presented. XTFEM is coupled with the two-scale continuum damage mechanics model [3] for evaluating fatigue damage accumulation, with a damage model governing the fatigue crack-initiation and propagation as the simulation progresses. HCF simulations are performed using the proposed methodology on a specimen with an initial notch. Results obtained for the total fatigue life of specimen (fatigue crack initiation and propagation) under different loading conditions are presented. Proposed simulation can serve as the robust tool for predicting the life of structural components.
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