NDLI: A New Energy-Based Multiaxial Fatigue Life Prediction Procedure

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Tarar, Wasim Scott-Emuakpor, Onome Shen, M. -H Herman George, Tommy Cross, Charles
Copyright Year	2008
Abstract	An energy-based fatigue life prediction framework was previously developed by the authors for prediction of axial and bending fatigue life at various stress ratios. The framework for the prediction of fatigue life via energy analysis was based on a new constitutive law, which states the following: the amount of energy required to fracture a material is constant. In this study, energy expressions that construct the constitutive law are equated in the form of total strain energy and the distortion energy dissipated in a fatigue cycle. The resulting equation is further evaluated to acquire the equivalent stress per cycle using energy based methodologies. The equivalent stress expressions are developed both for biaxial and multiaxial fatigue loads and are used to predict the number of cycles to failure based on previously developed prediction criterion. The equivalent stress expressions developed in this study are further used in a new finite element procedure to predict the fatigue life for two and three dimensional structures. The final output of this finite element analysis is in the form of number of cycles to failure for each element on a scale in ascending or descending order. Therefore, the new finite element framework can provide the number of cycles to failure at each location in gas turbine engine structural components. In order to obtain experimental data for comparison, an Al6061-T6 plate is tested using a previously developed vibration based testing framework. The finite element analysis is performed for Al6061-T6 aluminum and the results are compared with experimental results.
Sponsorship	International Gas Turbine Institute
Starting Page	215
Ending Page	223
Page Count	9
File Format	PDF
ISBN	9780791843154
DOI	10.1115/GT2008-51170
e-ISBN	0791838242
Volume Number	Volume 5: Structures and Dynamics, Parts A and B
Conference Proceedings	ASME Turbo Expo 2008: Power for Land, Sea, and Air
Language	English
Publisher Date	2008-06-09
Publisher Place	Berlin, Germany
Access Restriction	Subscribed
Subject Keyword	Fatigue life Cycles Vibration Aluminum Fatigue Fracture (materials) Stress Fracture (process) Structural elements (construction) Gas turbines Finite element analysis Failure Constitutive equations Testing
Content Type	Text
Resource Type	Article

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