Ah&met-Sib's fracture criterion based on strain energy density, S, for mixed mode crack extension under static loading is extended to dynamic mixed mode, K, and K,,, crack propagation. Influence of the second order term, uox, which represents the non-singular constant stress acting parallel to the d
Fracture criterion of a mixed-mode crack based on CED (Crack Energy Density)
β Scribed by Takao Utsunomiya; Katsuhiko Watanabe
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 659 KB
- Volume
- 142
- Category
- Article
- ISSN
- 0029-5493
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Furthermore, we have proved that the null space of the linear operator of Piola-Kirchhoff stress history functional is the direct sum of the null space of linear operators for 6-D vector subspace N, and N,. Here we can naturally classify the fracture of isotropic material with memory into two types.
The strain energy criterion for crack propagation proposed in the paper is based on the principle that the direction of crack propagation takes place along the direction where the distance from the crack tip to a certain contour line of constant distortional strain energy density is minimum, and the
The strain energy density factor or .S-criterion [l] has been widely used in fracture mechanics and our work confnms that it can be used to explain the cracking behavior of a homogeneous, isotropic solid. However, it was found to be inadequate for some composite materials and a new hypothesis called
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Abatraet-An improved approach for the prediction of the branching angle of running cracks is presented. It is based on the assumption that from the early steps of propagation, ahead of the running main crack-tip a tuft of microcracks is formed, from which two symmetric microcracks prevail over the o