ISSN:
1619-6937
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Summary We study plane strain dynamic thermomechanical deformations of a FCC single crystal deformed at an average strain-rate of 1 000 s−1 along the crystallographic direction [380] with the plane of deformation parallel to the plane (001) of the single crystal. Four different situations are studied; in the first two there is no initial imperfection assumed in the crystal and it is either compressed or pulled, and in the other two the crystal is compressed but either the initial temperature is nonuniform or a small region around the centroid of the cross-section is misoriented relative to the rest of the cross-section. In each case, all twelve slip systems are assumed to be potentially active, and the crystal material is presumed to exhibit strain hardening, strain-rate hardening, and thermal softening. These effects are modelled by using a simple combined isotropic-kinematic hardening expression for the critical resolved shear stress, proposed by Weng, and modified to incorporate the effect of thermal softening of the material. It is found that each one of the slip systems $$(111) [\bar 110], (11\bar 1) [\bar 110], (\bar 111) [110]$$ , and $$(\bar 11\bar 1) [110]$$ contributes essentially equally to the plastic deformations of the crystal and these slip systems become active soon after the load is applied. The same holds for the slip systems $$(111) [01\bar 1], (11\bar 1) [011], (\bar 111) [101]$$ , and $$(1\bar 11) [\bar 101]$$ except that they are active in a region different from that of the previous one. The remaining four slip systems either stay inactive throughout the deformation process, or become active at late stages of the deformation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01212642
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