Fatigue strength depending on position of cracks for weldments |
| |
Authors: | Hae Woo Lee Won Jo Park |
| |
Affiliation: | 1. Welding Research Team, Hanjin Heavy Industries, Busan, Korea 2. School of Mechanical and Aerospace Engineering, Gyeongsang National University, Institute of of Marine Industry, Kyeongnam, Korea
|
| |
Abstract: | This is a study of fatigue strength of weld deposits with transverse cracks in plate up to 50 mm thick. It is concerned with
the fatigue properties of welds already with transverse cracks. A previous study of transverse crack occurrence, location
and microstructure in accordance with welding conditions was published in the Welding Journal (Lee et al., 1998). A fatigue
crack develops as a result of stress concentration and extends with each load cycle until fatigue occurs, or until the cyclic
loads are transferred to redundant members. The fatigue performance of a member is more dependent on the localized state of
stress than the static strength of the base metal or the weld metal. Fatigue specimens were machined to have transverse cracks
located on the surface and inside the specimen. Evaluation of fatigue strength depending on location of transverse cracks
was then performed. When transverse cracks were propagated in a quarter-or half-circle shape, the specimen broke at low cycle
in the presence of a surface crack. However, when the crack was inside the specimen, it propagated in a circular or elliptical
shape and the specimen showed high fatigue strength, enough to reach the fatigue limit within tolerance of design stresses. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|