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Abstract
Pulsating fatigue tests have been performed using the specimens with or without surface deformation to investigate the effect of compressive mean stress on fatigue properties of structural steel. In addition, the specimen's surface has been observed by the successive taken replica method to investigate the change of surface state and fatigue crack initiation mechanism. The main results obtained in this tests are as follows; (1) The fatigue limits of the specimens with and without surface deformation are 147 and 371 MPa, respectively. The above much difference of the fatigue limit would be caused by the compressive residual stress and work-hardening due to roller working. (2) According to increase of the compressive mean stress from 0, -75, -150 and -225 MPa, the fatigue limits of these specimens also increase and are in proportion to 147, 160, 178, and 208 MPa, respectively. (3) The non-propagating micro-cracks are observed in the specimens suffered by 1 X 10^ cycles of the fatigue limit and their number and length become increase according to compressive mean stress or compressive residual one. (4) According to the above results, the compressive mean stress and compressive residual stress suppress the transition from crack initiation to propagation.
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