FATIGUE STRENGTH AND FATIGUE FRACTURE MECHANISM FOR SPOT WELDS IN U-SHAPE SPECIMENS

MAHMOUD SHARIATI; REZA MASOUDI NEJAD

FATIGUE STRENGTH AND FATIGUE FRACTURE MECHANISM FOR SPOT WELDS IN U-SHAPE SPECIMENS

Authors

MAHMOUD SHARIATI FACULTY OF ENGINEERING, DEPARTMENT OF MECHANICAL ENGINEERING, FERDOWSI UNIVERSITY OF MASHHAD, MASHHAD, IRAN HTTP://ORCID.ORG/0000-0003-3042-1896
REZA MASOUDI NEJAD FACULTY OF ENGINEERING, DEPARTMENT OF MECHANICAL ENGINEERING, FERDOWSI UNIVERSITY OF MASHHAD, MASHHAD, IRAN HTTP://ORCID.ORG/0000-0001-7606-9520

Keywords:

CRACK GROWTH, FRACTURE MECHANICS, FINITE ELEMENT, STRESS INTENSITY FACTOR, FATIGUE LIFE.

Abstract

IN THIS PAPER, THE FATIGUE BEHAVIOR OF THE METALLIC WELDED U-SHAPE SPECIMENS SUBJECTED TO CYCLIC LOADING HAVE BEEN INVESTIGATED VIA EXPERIMENTAL AND NUMERICAL ANALYSIS. TO DO SO, TWO SETS OF THE SPOT WELDED SPECIMENS WITH DIFFERENT SIZES WERE PREPARED AND FATIGUE TESTS WERE CONDUCTED UNDER THE VARIOUS CYCLIC LOADS. THE CRACK PROPAGATION IS NUMERICALLY EXAMINED BY USING THE STRESS INTENSITY FACTOR VALUES ACHIEVED FROM FE ANALYSES. THE MODIFIED PARIS AND FORMANÂNEWMANÂDE KONING MODELS WERE USED TO ESTIMATE THE FATIGUE CRACK GROWTH RATE. THE RESULTS INDICATE THAT THE FATIGUE LIFE OF SPECIMENS DECREASES WITH ANY INCREASE IN LOAD LEVEL.

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Published

2016-11-01

Issue

Vol. 13 No. 15 (2016)

Section

Articles

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