Incorporating Residual Stresses in Life Prediction of Turbine Engine Disks
Incorporating Residual Stresses in Life Prediction of Turbine Engine Disks
复制标题
将残余应力纳入涡轮发动机盘的寿命预测
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
N. Ashbaugh
中科院分区：
文献类型：
--
作者：
R. John;J. Larsen;D. Buchanan;N. Ashbaugh
摘要：美国空军已经启动了一项称为发动机转子寿命延长（ERLE）的技术开发计划，其目标是延长目前已部署的燃气涡轮机发动机中的主要、非关键部件的使用寿命，而不增加部件故障的风险。要完全实现这一目标，就需要改进广泛的技术，包括寿命预测和断裂力学、无损评估、发动机使用和健康监测以及部件维修。本文着重于寿命预测过程中的一个关键方面-残余应力的影响纳入。残余压应力在提高疲劳寿命、延缓裂纹扩展和抗外物损伤方面的益处已被证明。因此，在涡轮机发动机部件中广泛采用了有益的表面处理。然而，目前基于损伤容限的寿命管理实践并没有明确地考虑表面强化过程引起的残余应力。如果在寿命预测方法中考虑残余应力，可以显著提高损伤容限。本文提供了一个评估的残余应力的作用，在组件的耐久性，并确定关键问题，以解决在实施寿命预测方法。
Abstract : The U.S. Air Force has initiated a technology development initiative known as Engine Rotor Life Extension (ERLE), which has the goal of extending the useful lifetime of major, fracture-critical components in currently fielded gas turbine engines, without increasing the risk of component failure. Full achievement of this goal will require improvements in a broad range of technologies, including life prediction and fracture mechanics, nondestructive evaluation, engine usage and health monitoring, and component repair. This paper focuses on a key aspect of the life prediction process - the incorporation of residual stress effects. The benefits of compressive residual stresses in improving fatigue life, retardation of crack growth and resistance to foreign object damage have been demonstrated. Hence, the%se beneficial surface treatments are extensively employed in the turbine engine components. However, current damage-tolerance-based life management practices do not explicitly account for the residual stresses induced by surface enhancement procedures. Significant increase in predicted damage tolerance can be obtained if residual stresses are included in the life prediction methodology. This paper provides an assessment of the role of residual stresses in the durability of the component and identifies critical issues to be addressed during implementation in life prediction methods.