skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Fracture mechanics approach to estimate fatigue lives of welded lap-shear specimens

Abstract

A full range of stress intensity factor solutions for a kinked crack with finite length is developed as a function of weld width and the sheet thickness. When used with the main crack solutions (global stress intensity factors) in terms of the applied load and the specimen geometric parameters, the fatigue lived of the kinked crack can be estimated for the laser-welded lap-shear specimens. The predicted curve for the load range-fatigue life passes through the cluster of experimental data and is in good agreement. A classical solution associated with an infinitesimal kink is also employed. Furthermore, its life prediction tends to overestimate the actual fatigue life. In addition, the traditional fatigue life estimation based on structural stress is performed for completeness. As a result, this non-fracture mechanics approach only agrees well with the experimental data under high cyclic load conditions.

Authors:
 [1];  [2]
  1. Savannah River National Lab., Aiken, SC (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1345816
Report Number(s):
SRNL-STI-2014-00174
Journal ID: ISSN 1546-2218
Grant/Contract Number:  
AC09-08SR22470
Resource Type:
Accepted Manuscript
Journal Name:
Computers, Materials and Continua (Print)
Additional Journal Information:
Journal Name: Computers, Materials and Continua (Print); Journal Volume: 46; Journal Issue: 1; Conference: International Conference on Computational and Experimental Engineering and Sciences (ICCES 2014) , Changwon (South Korea), 12-17 Jun 2014; Journal ID: ISSN 1546-2218
Publisher:
Tech Science Press
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 42 ENGINEERING; kinked crack; stress intensity factor; lap-shear; weld; fatigue life; Paris law

Citation Formats

Lam, Poh -Sang, and Pan, Jwo. Fracture mechanics approach to estimate fatigue lives of welded lap-shear specimens. United States: N. p., 2015. Web. doi:10.3970/cmc.2015.046.001.
Lam, Poh -Sang, & Pan, Jwo. Fracture mechanics approach to estimate fatigue lives of welded lap-shear specimens. United States. doi:10.3970/cmc.2015.046.001.
Lam, Poh -Sang, and Pan, Jwo. Mon . "Fracture mechanics approach to estimate fatigue lives of welded lap-shear specimens". United States. doi:10.3970/cmc.2015.046.001. https://www.osti.gov/servlets/purl/1345816.
@article{osti_1345816,
title = {Fracture mechanics approach to estimate fatigue lives of welded lap-shear specimens},
author = {Lam, Poh -Sang and Pan, Jwo},
abstractNote = {A full range of stress intensity factor solutions for a kinked crack with finite length is developed as a function of weld width and the sheet thickness. When used with the main crack solutions (global stress intensity factors) in terms of the applied load and the specimen geometric parameters, the fatigue lived of the kinked crack can be estimated for the laser-welded lap-shear specimens. The predicted curve for the load range-fatigue life passes through the cluster of experimental data and is in good agreement. A classical solution associated with an infinitesimal kink is also employed. Furthermore, its life prediction tends to overestimate the actual fatigue life. In addition, the traditional fatigue life estimation based on structural stress is performed for completeness. As a result, this non-fracture mechanics approach only agrees well with the experimental data under high cyclic load conditions.},
doi = {10.3970/cmc.2015.046.001},
journal = {Computers, Materials and Continua (Print)},
number = 1,
volume = 46,
place = {United States},
year = {2015},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share: