Plasticity of Metals: Experiments, Models, Computation by Steck E., Ritter R., et al. (eds.)

By Steck E., Ritter R., et al. (eds.)

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75% are greatly increased. The additional hardening effect may be regarded here as a consequence of the planar flow behaviour. 2 Dislocation structures The dislocation structure of AlMg3 is characterized by walls of prismatic edge dipoles. Mobile screw dislocations lie between them. For all strain amplitudes and loading types studied, the dipolar walls lie in (111) planes at the onset of fatigue. 3 Results of loading determine the resultant saturation structure. Using a model by Dickson et al. [11, 12], all wall orientations that differ from (111) planes can be indexed.

4] F. Ellyin: An isotropic hardening rule for elastoplastic solids based on experimental observations. Journal of Applied Mechanics 56 (1969) 499. [5] N. K. Gupta, H. A. Lauert: A study of yield surface upon reversal of loading under biaxial stress. Zeitschrift fu¨r angewandte Mathematik und Mechanik 63(10) (1983) 497–504. [6] J. F. Williams, N. L. Svensson: Effect of torsional prestrain on the yield locus of 1100-F aluminium. Journal of Strain Analysis 6(4) (1971) 263. [7] R. Hillert: Austenitische Sta¨hle bei ein- und bei zweiachsiger, plastischer Wechselbeanspruchung.

4 b). 4 c). The considerations regarding the additional hardening effect in AlMg3 are equally applicable here. 75% shows a relatively short strain hardening region already reaching saturation after about 20 cycles. But the 90 8 phase-shifted loading produces a strong additional hardening effect. 05%, material: copper. 4404. 4404. ate stress values compared with proportional loading are increased by more than 60%. 5 a). 5% too, the material reaches saturation for proportional loading after about 20 cycles.

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