Computer simulated analyses on deformation and fracture of non-cracked and cracked specimens |
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Authors: | Zhang Keshi Zheng Changqing |
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Institution: | (1) Northwestern Polytechnical University, 710072 Xi'an |
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Abstract: | A unified damage and fracture model, the combinatory work density model, which is suitable for either non-cracked body or
cracked body has been suggestedt−7]. In the present paper, the deformation and fracture of the two kinds of tensile spceimen and TPB specimen made of 40Cr steel
have been simulated by using the new model together with the large elastic-plastic deformation finite element method. The
results give a good picture of the whole deformation and fracture processes of the specimens in experiments; especially, the
results on the TPB specimen can be used to obtain the relationship between load and displacement at the loading pointP-Δ, and between crack extension and displacement at the loading point Δa-Δ, the resistance curveJ
R
-Δa and the fracture toughnessJ
1C
. All the results are in remarkable agreement with those obtained by experiments. Therefore the model suggested here can be
used to simulate crack initiation and propagation in non-cracked body and fracture initiation and crack stable propagation
in cracked body.
The project supported by National Natural Science Foundation of China |
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Keywords: | damage and fracture model fracture initiation and crack propagation large elastic-plastic deformation numerical simulation |
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