โ Scribed by M. Ramulu; A.S. Kobayashi
No coin nor oath required. For personal study only.
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 direction of crack propagation, on the S distribution surrounding the crack tip, is demonstrated. Numerical studies show that positive u= enhances the fracture angle and negative u, reduces the fracture angle irrespective of the sign of i&/K,, when S is measured at a critical distance r, from the crack tip. This fracture criterion is verified by the crack curving results of dynamic photoelastic fracture specimens. Omission of o,, term leads to predicted fracture angles which are at variance with experimental data.
๐ SIMILAR VOLUMES
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
## In this paper, crack initiation is postulated to occur in the direction along which the tangential strain energy density factor possesses a maximum value and when it reaches a critical value in the angled crack problem. As a result of its examination, we can see that this criterion is able to b
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.
## Ahatract-Results of experiments using the Iosipescu test specimen in which axial compression has been introduced in addition to the shearing loads are reported here. Different crack paths and fracture modes were obtained depending on the presence or absence of axial compression. Computer model