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Damage and life assessment of materials undergoing concurrent fatigue and cyclic plastic strain accumulation over asymmetric multiaxial stress cycles with various loading spectra

Damage and life assessment of materials undergoing concurrent fatigue and cyclic plastic strain accumulation over asymmetric multiaxial stress cycles with various loading spectra
在具有各种载荷谱的不对称多轴应力循环中经历并发疲劳和循环塑性应变累积的材料的损伤和寿命评估
批准号:
RGPIN-2016-04957
负责人:
VarvaniFarahani, Ahmad
金额:
$2.11万
依托单位:
依托单位国家:
加拿大
项目类别:
Discovery Grants Program - Individual
财政年份:
2017
资助国家:
加拿大
项目状态:
已结题
起止时间:
2017-01-01 至 2018-12-31

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中文摘要
翻译
在许多工程部件和结构中,在非对称应力循环(称为棘轮)上累积的塑性应变以及在疲劳循环中的逐渐损伤过程是导致失效的主要原因。据报道,工程结构的灾难性失效每年造成的损失超过1500亿美元,原因是部件/结构的几何形状复杂,以及它们在使用中所经历的严重载荷。当疲劳和棘轮现象结合在一起时,两者都会逐渐造成损害。安全问题和与工程材料失效相关的费用,需要通过开发一种强大的疲劳棘轮损伤方法,在材料失效的设计和分析中实现高度可靠性。
英文摘要
The accumulated plastic strain over asymmetric stress cycles, referred as ratcheting, and gradual damage progress over fatigue cycles are the principal causes of failure in many engineering components and structures. The reported cost of catastrophic failure in engineering structures annually exceeds $150 billion due to the complexity in geometry of components/ structures and the severe loads they experience in service. Both fatigue and ratcheting phenomena progressively cause damage when they are coupled. Safety issues and expenses associated with failure of engineering materials, necessitate implementing a high degree of reliability in design and analysis against failure of materials by developing a robust fatigue-ratcheting damage approach.
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