NASALIFE - Component Fatigue and Creep Life Prediction Program
NASALIFE - Component Fatigue and Creep Life Prediction Program
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NASALIFE - 部件疲劳和蠕变寿命预测程序
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
S. Mital
中科院分区：
文献类型：
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作者：
J. Gyekenyesi;P. Murthy;S. Mital
NASALIFE是由陶瓷基复合材料(CMC)制成的推进系统部件在循环热机械载荷和蠕变断裂条件下的寿命预测程序。虽然主要侧重于CMC组件，但基本方法也同样适用于其他材料系统。该程序将低周疲劳(LCF)、蠕变断裂和静态材料性能的经验数据作为寿命预测过程的一部分。多轴应力采用基于冯·米塞斯的方法，平均应力效应采用Walker模型。通过雨流计数法或峰值计数型法来减少变化的负载。最后，将循环载荷和蠕变引起的损伤与Minor法则相结合来确定循环载荷引起的损伤、蠕变引起的损伤、每个任务的总损伤以及部件在失效前可以提供的潜在任务数。
NASALIFE is a life prediction program for propulsion system components made of ceramic matrix composites (CMC) under cyclic thermo-mechanical loading and creep rupture conditions. Although the primary focus was for CMC components, the underlying methodologies are equally applicable to other material systems as well. The program references empirical data for low cycle fatigue (LCF), creep rupture, and static material properties as part of the life prediction process. Multiaxial stresses are accommodated by Von Mises based methods and a Walker model is used to address mean stress effects. Varying loads are reduced by the Rainflow counting method or a peak counting type method. Lastly, damage due to cyclic loading and creep is combined with Minor's Rule to determine damage due to cyclic loading, damage due to creep, and the total damage per mission and the number of potential missions the component can provide before failure.