Life Prediction for Turbopropulsion Systems Under Dwell Fatigue Conditions

被引：24

作者：

Chan, Kwai S. ^{[1
]}

Enright, Michael P. ^{[1
]}

Moody, Jonathan P. ^{[1
]}

Hocking, Benjamin ^{[2
]}

Fitch, Simeon H. K. ^{[2
]}

机构：

[1] SW Res Inst, San Antonio, TX 78238 USA

[2] Elder Res Inc, Charlottesville, VA 22903 USA

来源：

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME | 2012年 / 134卷 / 12期

关键词：

Risk assessment - Cracks - Forecasting - Risk analysis;

D O I：

10.1115/1.4007321

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The objective of this investigation was to develop an innovative methodology for life and reliability prediction of hot-section components in advanced turbopropulsion systems. A set of three generic time-dependent crack growth models was implemented and integrated into the DARWIN (R) probabilistic life-prediction code. Using the enhanced risk analysis tool and material constants calibrated to IN 718 data, the effect of time-dependent crack growth on the risk of fracture in a turboengine component was demonstrated for a generic rotor design and a realistic mission profile. The results of this investigation confirmed that time-dependent crack growth and cycle-dependent crack growth in IN 718 can be treated by a simple summation of the crack increments over a mission. For the temperatures considered, time-dependent crack growth in IN 718 can be considered as a K-controlled environmentally-induced degradation process. Software implementation of the generic time-dependent crack growth models in DARWIN provides a pathway for potential evaluation of the effects of multiple damage modes on the risk of component fracture at high service temperatures. [DOI: 10.1115/1.4007321]

引用

页数：8

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