By Steck E., Ritter R., et al. (eds.)
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Example text
Steck, R. Ritter, U. Peil, A. Ziegenbein Copyright © 2001 Wiley-VCH Verlag GmbH ISBNs: 3-527-27728-5 (Softcover); 3-527-60011-6 (Electronic) 3 Plasticity of Metals and Life Prediction in the Range of Low-Cycle Fatigue: Description of Deformation Behaviour and Creep-Fatigue Interaction Kyong-Tschong Rie, Henrik Wittke and Ju¨rgen Olfe * Abstract Results of low-cycle fatigue tests are presented and discussed, which were performed at the Institut fu¨r Oberfla¨chentechnik und plasmatechnische Werkstoffentwicklung of the Technische Universita¨t Braunschweig, Germany.
If a tension/compression experiment is immediately followed by one with alternating torsion, the dislocation structure is initially unfavourable for torsion. With changing loading direction, the sources of torsional slip dislocations are activated first and then later on, the dipolar walls change their orientation to one more favourable for torsional loading. 01% yield surface diameter after changing the loading direction from tension/compression to alternating torsion. the loading direction. The result is an immediate drastic reduction of the yield surface diameter.
For the extension to different grain boundary velocities, the non-recrystallized state was subdivided further. The fourth descriptive characteristic after the geometry, environment and possible states are the rules of evolution. These stipulate, which states the cells will adopt in the next time-step. If a cell already has a recrystallized environment, the rules predict that in the next time-step, this cell will also adopt the recrystallized state. Using this simple cellular automaton, it is possible to solve the differential equation of the JMAK theory.
