Microstructure dependent fatigue crack growth in aged hardened aluminium alloys Export

@article{borrego04a, abstract = {Fatigue crack propagation tests in constant amplitude loading, as well as with single peak overloads, have been performed in AlMgSi1-T6 aluminium alloys with different Mn and Cr contents. Crack closure was monitored in all tests by the compliance technique using a pin microgauge. A moderate stress ratio and a strong material dependence effects on the fatigue crack growth were observed. These effects are discussed in terms of the different dominant closure mechanism (plasticity-induced closure or roughness-induced closure). Roughness-induced closure dominates crack closure in the alloys with higher contents of Mn and Cr elements. In the alloy with a lower content of these elements, plasticity-induced closure is dominant. When roughness-induced closure is the prime pre-overload closure mechanism, the retardation effect is decreased in comparison to when plasticity-induced closure is dominant. \© 2004 Elsevier Ltd. All rights reserved.}, author = {Borrego, L. P. and Costa, J. M. and Silva, S. and Ferreira, J. M.}, citeulike-article-id = {449637}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.ijfatigue.2004.04.004}, journal = {International Journal of Fatigue}, key = {Crack propagation}, keywords = {6082, bibtex-import, fractography, microstructure, roughness, surface}, number = {12}, pdf = {borrego04a.pdf}, posted-at = {2005-12-25 12:44:48}, priority = {2}, title = {Microstructure dependent fatigue crack growth in aged hardened aluminium alloys}, url = {http://dx.doi.org/10.1016/j.ijfatigue.2004.04.004}, volume = {26}, year = {2004} }

TY - JOUR ID - borrego04a L3 - citeulike-article-id:449637 N2 - Fatigue crack propagation tests in constant amplitude loading, as well as with single peak overloads, have been performed in AlMgSi1-T6 aluminium alloys with different Mn and Cr contents. Crack closure was monitored in all tests by the compliance technique using a pin microgauge. A moderate stress ratio and a strong material dependence effects on the fatigue crack growth were observed. These effects are discussed in terms of the different dominant closure mechanism (plasticity-induced closure or roughness-induced closure). Roughness-induced closure dominates crack closure in the alloys with higher contents of Mn and Cr elements. In the alloy with a lower content of these elements, plasticity-induced closure is dominant. When roughness-induced closure is the prime pre-overload closure mechanism, the retardation effect is decreased in comparison to when plasticity-induced closure is dominant. © 2004 Elsevier Ltd. All rights reserved. IS - 12 JF - International Journal of Fatigue TI - Microstructure dependent fatigue crack growth in aged hardened aluminium alloys VL - 26 KW - 6082 KW - bibtex-import KW - fractography KW - microstructure KW - roughness KW - surface AU - Borrego, LP AU - Costa, JM AU - Silva, S AU - Ferreira, JM PY - 2004/// UR - http://dx.doi.org/10.1016/j.ijfatigue.2004.04.004 ER -