Validation of a Computational Model for Predicting Fatigue Life

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Creator: 

Gaonkar, Nilesh Vishwanath

Date: 

2019

Abstract: 

A new computer model to predict fatigue life based on the evolution of damage in a structure is presented. The experimental data used to validate the model is provided by the SAE FDE Committee. The implemented damage model assumes that damage evolution can be computed as a function of the dissipation of hysteresis loop for a sequence of Ramberg-Osgood equations for a sequence of fatigue load cycles. This model does not use the Paris-Erdogan equation for crack growth. Two model parameters are the coefficients of the Ramberg-Osgood equation. The third model parameter is the total dissipation for the damage variable to reach a value of 1.0. Computer simulations of fatigue tests with block loading are demonstrated. A high-resolution plane strain FEM analysis that resolves the strain field near a stress concentration is shown to be necessary to achieve accurate predictions of fatigue crack nucleation and fatigue crack growth.

Subject: 

Engineering - Mechanical
Materials -- Fatigue
Structural analysis (Engineering)

Language: 

English

Publisher: 

Carleton University

Thesis Degree Name: 

Master of Applied Science: 
M.App.Sc.

Thesis Degree Level: 

Master's

Thesis Degree Discipline: 

Engineering, Mechanical

Parent Collection: 

Theses and Dissertations

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