Publication Date

2020

Document Type

Dissertation/Thesis

First Advisor

Gau, Jenn-Terng

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Mechanical Engineering

Abstract

A relatively new fracture theory known as peridynamics has been developed which uses a nonlocal theory to describe crack growth, resolving many of the issues associated to the classical continuum theory. Internal material interactions are described via a family of ‘bonds’, capable of exerting force over a macro-scale region of influence known as the horizon. Bond damage accumulates naturally due to repeated cyclic or critical loading and damage precipitates as a growing crack as bonds reach a critical damage and are severed. In the present work a modified compact tension specimen subjected to cyclic loading is modeled with the 2D peridynamic theory implemented in FEM software. A bond-based fatigue damage model is incorporated via user subroutine to model bond damage and crack growth. A constant stress intensity factor (SIF) at the crack tip is maintained via a feedback loop which evaluates the SIF via the nonlocal J-integral. Results of the crack path spatial position and damage accumulation rate will be validated against empirical data. The method and subroutines established will provide a basis for further validation of the theory and its applications.

Extent

101 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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