Cyclic Mixed-Mode Crack Propagation due to Time-Dependent Multiaxial Loading in Jet Engines

Abstract:

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Components in jet engines are subject to time-dependent multiaxial loading. This creates a time-varying mixed-mode stress state at the crack tip. Mixed-mode loading leads to out-of-plane crack propagation and has been treated in previous articles [1,2]. This paper concentrates on coping with the time-dependent character. Key issues are the crack propagation rate and the crack propagation direction in three-dimensional space. In order to determine the prevalent crack propagation direction the dominant loading case is determined based on its crack propagation rate. Then, a mixed-mode equivalent K-factor is calculated for all other loading cases based on the closeness of their associated crack propagation direction with the dominant one. Subsequently, a cycle extraction is performed on the crack propagation rate for all loading cases. The extracted cycles are processed based on their mimimum and maximum equivalent K-factor and the maximum temperature. The mission crack propagation rate consists of the sum of the rate of all extracted cycles.

Info:

Periodical:

Key Engineering Materials (Volumes 488-489)

Edited by:

Z. Tonković and M.H. Aliabadi

Pages:

93-96

DOI:

10.4028/www.scientific.net/KEM.488-489.93

Citation:

G. Dhondt "Cyclic Mixed-Mode Crack Propagation due to Time-Dependent Multiaxial Loading in Jet Engines", Key Engineering Materials, Vols. 488-489, pp. 93-96, 2012

Online since:

September 2011

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Price:

$35.00

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