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Abstract
This paper presents an experimental study on the fatigue behaviour of shot-peened open-hole plates with Q345 steel. The beneficial effects induced by shot peening on the fatigue life improvement are highlighted. The characteristic fatigue crack initiation and propagation modes of open-hole details under fatigue loading are revealed. The surface hardening effect brought by the shot peening is analyzed from the aspects of in-depth micro-hardness and compressive residual stress. The fatigue life results are evaluated and related design suggestions are made as a comparison with codified detail categories. In particular, a fracture mechanics theory-based method is proposed and demonstrated its validity in predicting the fatigue life of studied shot-peened open-hole details.
Highlights
Bolted connections in steel bridges are subjected to fatigue loading due to continuous vehicular traffic
Shot peening has been extensively applied with the purpose of fatigue life improvement since the work-hardening and considerable compressive residual stresses can be introduced as a result of near-surface plastic deformation [3,4]
The characteristics of crack propagation at surface and subsurface layers were analyzed with the aid the of aid of scanning microscopy
Summary
Bolted connections in steel bridges are subjected to fatigue loading due to continuous vehicular traffic. Xiang et al [16] This method was proved by Liu and Mahadevan [17] as efficient in combination with probabilistic crack growth analysis to predict the fatigue life of smooth specimens. It is important to understand the advantage of shot peening over some other techniques in the increase of fatigue life of open-hole steel plates. The fatigue behaviour of open-hole steel plates induced by shot peening is studied. Theoretical equations are developed in the evaluation of the improvement of fatigue life results of shot-peened open-hole details. The main concerns are given for the fatigue failure behaviour, and for the theoretical method in the evaluation of fatigue strength of open-hole details which differentiates this presented research work from the others reported in the literature
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