Improvement Effects of Fatigue Strength by Burr Grinding and Hammer Peening Under Variable Amplitude Loading
- 129 Downloads
This study investigates improvement effects of fatigue strength by burr grinding and hammer peening treatments. High-cycle fatigue tests with constant and variable amplitude loadings are performed on out-of-plane gusset plate specimens. Test results indicate that the reduction of stress concentration by the burr grinding greatly improves the fatigue life under both the constant and variable amplitude loadings. For the variable amplitude loading, the damage accumulation D obtained by Miner’s rule with the mean curve of constant amplitude loading is conservative (D > 1.5). However, under the variable amplitude loading, since the beneficial effects of the peening treatment on the fatigue life decrease due to the relaxation of compressive residual stress, the damage accumulations in specimens prepared by cleaning and subsequent hammer peening are extremely non-conservative (D ≈ 0.2). In addition, the stress patterns do not affect the fatigue life significantly.
IIW- Thesaurus keywordsCompressive strength Peening Residual stresses Variable loading
Unable to display preview. Download preview PDF.
- Konishi T., Takahashi K. and Miki C.: Application of high strength steel on steel bridge and its effect on weight reduction, Proceedings of JSCE, 2000, vol. 654, pp. 91–103.Google Scholar
- Okada J., Murakami T. and Kawabata A.: Study of longer continuous composite two I-girder bridges utilizing the bridge high performance steels, Proceedings of JSCE, 2007, vol. 63, no. 2, pp. 141–155.Google Scholar
- Weich I., UmmenhoferT., Nitschke-Pagel Th., Dilger K. and Eslami H.: Fatigue behaviour of welded high strength steels after frequency mechanical post-weld treatments, IIW Doc. XII I-2154-07, 2007.Google Scholar
- Kuhlmann U., Dürr A. and Günther H.-P.: Application of post-weld treatment methods to improve the fatigue strength of high strength steels in bridges, IABMAS-06, 2006.Google Scholar
- Haagensen P.J. and Maddox S.J.:IIWRecommendations on post weld fatigue life improvement of steel and aluminium structures, IIW Document XIII-2200r7-07, 2010.Google Scholar