By Dariusz Skibicki
This publication provides an outline at the fatigue of fabrics below non-proportional rather a lot. It provides the wealthy spectrum of phenomena and treats quite a few computational versions to mathematically describe the non-proportional fatigue of materials.
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Extra resources for Phenomena and Computational Models of Non-Proportional Fatigue of Materials
Int J Fatigue 19(3):219–235. 1016/ S0142-1123(96)00064-3 Shamsaei N, Fatemi A (2010) Effect of microstructure and hardness on non-proportional cyclic hardening coefficient and predictions. Mat Sci Eng A-Struct 527(12):3015–3024. 1016/j. 056 Skibicki D, Sempruch J, Pejkowski Ł (2014) Model of non-proportional fatigue load in the form of block load spectrum. Materialwiss Werkstofftech 45(2):68–78. 1002/mawe. 201400206 Socie DF, Marquis GB (2000) Multiaxial fatigue. Society of Automotive Engineers Zhang JX, Jiang YY (2005) An experimental investigation on cyclic plastic deformation and substructures of polycrystalline copper.
The lower the levels of loading, the more origin and ratchet marks appear. The walls of ratchet marks are slanted and tapered, which indicates the involvement of torsion. 43 contains a set of photographs of fracture faces and cracks in specimens made of Cu-ETP, which were produced in non-proportional loading with three different values of the k coefficient. 6 Macrostructure of the Material 45 specimen with the largest loading looks like the one for the tension-compression specimen. This is understandable, since the share of torsion is small.
In these metals, there is a high frequency of stacking faults and the distances between partial dislocations that form stacking faults are larger. Since cross-slip requires prior association of partial dislocations, the change in the slip plane by dislocation influenced by non-proportional load is difficult. In order to enable cross-slip, there has to be the constriction of the dissociated dislocation. Since a large distance must be covered, an association of partial dislocations requires additional stress (Itoh et al.