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| Numerical Analysis of the Crack-Tip Stress Field in Pure Aluminum Sheet Constrained by Interfaces |
| HAN Lihong; LI Liang; SUN Jun |
| State Key Laboratory for Mechanical Behavior of Materials; Xi'an Jiaotong University; Xi'an 110049 |
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Cite this article:
HAN Lihong; LI Liang; SUN Jun. Numerical Analysis of the Crack-Tip Stress Field in Pure Aluminum Sheet Constrained by Interfaces. Acta Metall Sin, 2004, 40(9): 920-926 .
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Abstract Elastic-plastic large deformation finite element (FE)
analysis was conducted on the crack-tip stress field of pure
Al sheet in LY12/Al/LY12 sandwich specimen with a strength
mismatch and fatigue pre-crack under plane strain condition. The results show that, in the
condition of small scale yielding (SSY), the peak value of loadings linearly increases with
decreasing pure Al sheet thickness. Plastic deformation zone in Al sheet constrained by interfaces
will spread along the crack-tip ligament parallel to the two interfaces
instead of a spindle-like in a constraint-free metal,
and this tendency becomes more remarkable with decreasing pure Al
thickness. The maximum triaxial constraint and the tensile stress continue to rise with either
increasing load or decreasing pure Al thickness. The high triaxial constraint in the Al sheet results
in cavitations and micro-cracks as well as brittleness even local
cleavage of pure Al sheet.
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Received: 25 September 2003
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