Cyclic stress-strain response and microstructure under variable amplitude loading Export

@article{christ96, abstract = {In order to study the cyclic stress-strain behaviour under variable amplitude loading in terms of dislocation glide character and microstructure, various metals and alloys were cyclically loaded in single-step tests and in an incremental step test (IST). The cyclic stress-strain curves (CSS curves) which correspond to the different loading conditions were compared and the shapes of the hysteresis loops were analyzed with respect to Masing or non-Masing behaviour. As expected, cyclic loading with constant amplitude leads to the formation of a characteristic dislocation arrangement that depends on the amplitude applied. The amplitude-related microstructure corresponds to the observation that Masing behaviour was not found in single-step tests. However, in the IST a state of saturation, or at least approximate saturation, is attained after some or many loading blocks. In the case of single-phase polycrystalline materials, wavy slip behaviour was found to be a prerequisite for the fulfillment of Masing behaviour. Then, the CSS curve, obtained by means of IST, intersects that of the single-step tests at an intermediate amplitude. Planar-slip materials show very similar CSS curves in spite of considerable differences in the dislocation arrangements for different testing modes. The behaviour of particle-hardened alloys depends very strongly on the relative effectiveness of the precipitates as obstacles for dislocation motion and can be understood analogously to single-phase materials on the basis of the resulting dislocation glide character.}, author = {Christ, H. J. and Mughrabi, H.}, citeulike-article-id = {449649}, journal = {Fatigue and Fracture of Engineering Materials and Structures}, key = {Fatigue of materials}, keywords = {bibtex-import, incremental, masing, step, test}, number = {2-3}, posted-at = {2005-12-25 12:44:49}, priority = {2}, title = {Cyclic stress-strain response and microstructure under variable amplitude loading}, volume = {19}, year = {1996} }

TY - JOUR ID - christ96 L3 - citeulike-article-id:449649 N2 - In order to study the cyclic stress-strain behaviour under variable amplitude loading in terms of dislocation glide character and microstructure, various metals and alloys were cyclically loaded in single-step tests and in an incremental step test (IST). The cyclic stress-strain curves (CSS curves) which correspond to the different loading conditions were compared and the shapes of the hysteresis loops were analyzed with respect to Masing or non-Masing behaviour. As expected, cyclic loading with constant amplitude leads to the formation of a characteristic dislocation arrangement that depends on the amplitude applied. The amplitude-related microstructure corresponds to the observation that Masing behaviour was not found in single-step tests. However, in the IST a state of saturation, or at least approximate saturation, is attained after some or many loading blocks. In the case of single-phase polycrystalline materials, wavy slip behaviour was found to be a prerequisite for the fulfillment of Masing behaviour. Then, the CSS curve, obtained by means of IST, intersects that of the single-step tests at an intermediate amplitude. Planar-slip materials show very similar CSS curves in spite of considerable differences in the dislocation arrangements for different testing modes. The behaviour of particle-hardened alloys depends very strongly on the relative effectiveness of the precipitates as obstacles for dislocation motion and can be understood analogously to single-phase materials on the basis of the resulting dislocation glide character. IS - 2-3 JF - Fatigue and Fracture of Engineering Materials and Structures TI - Cyclic stress-strain response and microstructure under variable amplitude loading VL - 19 KW - bibtex-import KW - incremental KW - masing KW - step KW - test AU - Christ, HJ AU - Mughrabi, H PY - 1996/// ER -