The near tip stress and strain fields in cracked single crystals |
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Authors: | Zhang Yongwei Wang Tzuchiang |
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Institution: | (1) LNM, Institute of Mechanics, Chinese Academy of Sciences, 100080 Beijing, China |
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Abstract: | The numerical analyses of stationary mathematically sharp Mode I crack in FCC and BCC crystals with elastic-ideally plastic
(EIP) and fast hardening saturation (FHS) law are carried out in the present paper. From the calculated results, it is shown
that: for the cases of small strain, EIP crystal cracks, the features of concentrated deformation patterns and the stress
state in near-crack tip deformation fields are identical to the earlier analytical solutions, but along the angular sector
boundaries, there exist narrow complex stress zones. The overall characteristics of deformation patterns for the cases of
EIP and FHS are similar. The behaviours of crack tip opening can be characterized by crack-tip-opening-displacement (CTOD).
For the case of FHS, finite deformation BCC crystal crack, our calculations are qualitatively in agreement with recent experimental
observations.
The project supported by National Natural Science Foundation of China |
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Keywords: | single crystal crack stress field finite element |
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