Download Constitutive Laws of Plastic Deformation and Fracture: 19th by R. M. Pelloux (auth.), A. S. Krausz, J. I. Dickson, J.-P. A. PDF

By R. M. Pelloux (auth.), A. S. Krausz, J. I. Dickson, J.-P. A. Immarigeon, W. Wallace (eds.)

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Dissertation, Georgia Institute of Technology, Atlanta, GA 1988. 3. W. D. Antolovich, NASA CR-4215, 1988. 4. W. D. ~~ 5. P. S. Ezz, IntI. Metals_Rev~, 29, 1984, p. 136. 6. V. P. Pope and V. Vitek, Acta~et~, 32, 1984, p. 435. 7. P. Walker and E. Jordan, In~_. t_~_l1g_,_ MatIs. and Structyres, in press. 47 500 400 til 0.. :l. :l. :l. :l. :l. :l. - a a TeIUllOIl Comprea8toll 5 10 15 20 Cycle (b) Figure 1. Octahedral ~IIiIX vs cycle. 705°C, 50lt/min. 04lt. 04lt. P p 48 500 400 ~ . 300 ::::s -.. f- S 200 e aa~~e 100 a-Tension l> ~ 0 0 Compre••iol1 5 10 15 20.

8), as classically observed. The strain hardening seems to be correlated to the crystallographic symetry of the loading axis: a load along <001> (8 slip systems) provides more strain hardening than along <011> (4 systems) and <111> (3 systems). However, these macroscopic observations and the activated microscopic phenomena remains to be correlated to each other. 5. MECHANICAL MODELING Apart from elastic and monotonous plastic changes limited to low distortions capable of being dealt with by simple models, the modeling of anisotropic cyclic viscoplastic behavior is much more difficult (14) : - application of a crystallographic model, where viscoplastic laws are assumed to apply to active systems, with interaction between these systems (15, 16), - use of a global mechanical concept, based on a thermodynamical approach such as the ONERA approach (15).

Increasing the tensile force, conduced to crack opening and propagation. The microcracks followed the above mentionned planes, but we also noticed short "saw tooth" crack paths, corresponding to octaedral to cubic crack plane transitions. At the intersections of these planes, dislocations were emitted in octaedral and cubic planes. Their 110lj straight directions beeing coplanar to the cubic and octaedral planes. The Burgers vectors of these dislocations has not yet been determined. At 1023 K (750°C), the cracks opened exclusively on {Ill} planes, without deviation on cubic planes.

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