| Coupling damage and reliability model of low-cycle fatigue and high energy impact based on the local stress–strain approach |
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| 基金项目： | supported by the National Natural Science Foundation of China(No.61104132) |
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| 摘 要： | Fatigue induced products generally bear fatigue loads accompanied by impact processes,which reduces their reliable life rapidly. This paper introduces a reliability assessment model based on a local stress–strain approach considering both low-cycle fatigue and high energy impact loads.Two coupling relationships between fatigue and impact are given with effects of an impact process on fatigue damage and effects of fatigue damage on impact performance. The analysis of the former modifies the fatigue parameters and the Manson–Coffin equation for fatigue life based on material theories. On the other hand, the latter proposes the coupling variables and the difference of fracture toughness caused by accumulative fatigue damage. To form an overall reliability model including both fatigue failure and impact failure, a competing risk model is developed. A case study of an actuator cylinder is given to validate this method.
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| 关 键 词： | 低周疲劳 可靠性模型 耦合关系 局部应力 损伤效应 高能量 累积疲劳损伤 可靠性评估模型 |
Coupling damage and reliability model of low-cycle fatigue and high energy impact based on the local stress–strain approach |
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| Authors: | Chen Hongxia Chen Yunxia Yang Zhou |
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| Abstract: | Fatigue induced products generally bear fatigue loads accompanied by impact processes, which reduces their reliable life rapidly. This paper introduces a reliability assessment model based on a local stress–strain approach considering both low-cycle fatigue and high energy impact loads. Two coupling relationships between fatigue and impact are given with effects of an impact process on fatigue damage and effects of fatigue damage on impact performance. The analysis of the former modifies the fatigue parameters and the Manson–Coffin equation for fatigue life based on material theories. On the other hand, the latter proposes the coupling variables and the difference of fracture toughness caused by accumulative fatigue damage. To form an overall reliability model including both fatigue failure and impact failure, a competing risk model is developed. A case study of an actuator cylinder is given to validate this method. |
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| Keywords: | Coupling damage Fatigue High-energy impactLow-cycle Local stress-strain Reliability Strain rate |
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