Notch-size effects in fatigue based on surface strain redistribution and crack closure

@article{citeulike:439375, abstract = {A fracture mechanics solution for the stress range at the fatigue limit and the depth of non-propagating cracks in smooth and notched specimens is presented. The solution is based on the non-uniformity of strains at the surface of a specimen and on the development of crack closure. Surface grains oriented for easy slip experience an inherent microstructurally dependent strain concentration, which decays with depth into the material at a rate that is inversely proportional to the grain size.For cracks in smooth specimens the threshold stress range is separated into a crack opening stress component and an intrinsic stress component. The latter is the stress range that is just sufficient to grow a fully open crack and it is estimated by considering the near-surface strain concentration for a variety of crack depths. The crack opening stress range is added to the intrinsic component to obtain the nominal threshold stress range as a function of crack depth. The maximum threshold stress range defines the fatigue limit of the specimen.For notched specimens a geometrical strain concentration is considered in addition to the inherent strain concentration. The predicted fatigue limits agree well with the observed values for a variety of notch sizes and stress ratios in the aluminium alloy 2024-T351. The proposed solution also offers a prediction for the depth of non-propagating cracks wa both smooth and notched specimens. In the latter, the depth of non-propagating cracks was found to be dependent on the notch radius and the stress level. The predictions of non-propagating crack depths agree with the experimental data for the aluminium alloy BSL65.}, author = {Abdel-Raouf, H. and Duquesnay, D. L. and Topper, T. H. and Plumtree, A.}, citeulike-article-id = {439375}, doi = {10.1016/0142-1123(92)90155-6}, journal = {International Journal of Fatigue}, keywords = {closure, crack, fatigue\_limit}, month = {January}, number = {1}, pages = {57--62}, posted-at = {2005-12-16 10:21:49}, priority = {2}, title = {Notch-size effects in fatigue based on surface strain redistribution and crack closure}, url = {http://dx.doi.org/10.1016/0142-1123(92)90155-6}, volume = {14}, year = {1992} }

TY - JOUR ID - citeulike:439375 L3 - citeulike-article-id:439375 N2 - A fracture mechanics solution for the stress range at the fatigue limit and the depth of non-propagating cracks in smooth and notched specimens is presented. The solution is based on the non-uniformity of strains at the surface of a specimen and on the development of crack closure. Surface grains oriented for easy slip experience an inherent microstructurally dependent strain concentration, which decays with depth into the material at a rate that is inversely proportional to the grain size.For cracks in smooth specimens the threshold stress range is separated into a crack opening stress component and an intrinsic stress component. The latter is the stress range that is just sufficient to grow a fully open crack and it is estimated by considering the near-surface strain concentration for a variety of crack depths. The crack opening stress range is added to the intrinsic component to obtain the nominal threshold stress range as a function of crack depth. The maximum threshold stress range defines the fatigue limit of the specimen.For notched specimens a geometrical strain concentration is considered in addition to the inherent strain concentration. The predicted fatigue limits agree well with the observed values for a variety of notch sizes and stress ratios in the aluminium alloy 2024-T351. The proposed solution also offers a prediction for the depth of non-propagating cracks wa both smooth and notched specimens. In the latter, the depth of non-propagating cracks was found to be dependent on the notch radius and the stress level. The predictions of non-propagating crack depths agree with the experimental data for the aluminium alloy BSL65. IS - 1 JF - International Journal of Fatigue EP - 62 TI - Notch-size effects in fatigue based on surface strain redistribution and crack closure VL - 14 SP - 57 KW - closure KW - crack KW - fatigue_limit AU - Abdel-Raouf, H AU - Duquesnay, DL AU - Topper, TH AU - Plumtree, A PY - 1992/01// UR - http://dx.doi.org/10.1016/0142-1123(92)90155-6 ER -