Differences Between Mode I and Mode II Crack Propagation |
| |
| Authors: | K B Broberg |
| |
| Institution: | (1) Department of Mathematical Physics, University College Dublin, Belfield, Dublin 4, Ireland |
| |
| Abstract: | Although mode I and mode II crack propagation show many similarities, in particular when analysed by linear elastic fracture
mechanics, they differ significantly in the micro-structural behaviour. These differences, which are clearly noticeable in
the fracture surface morphology, lead to fundamental differences in the macroscopic behaviour. Thus, mode II crack expansion
under remote loading, appears to obey micro-structural scaling laws, implying that the dimensions of the process region stay
essentially constant during crack expansion, rather than increasing with crack length. Therefore, expanding mode II cracks
can almost reach the Rayleigh velocity, and actually also intersonic velocities. An expanding mode I crack, on the other hand,
seems to obey continuum scaling laws, implying that the dimensions of the process region increase in proportion to crack length,
leading to self-similar crack expansion at a velocity significantly below the Rayleigh speed and dependent on the remote load. |
| |
| Keywords: | Dynamic crack propagation mode I mode II continuum scaling micro-structural scaling |
| 本文献已被 SpringerLink 等数据库收录！ |
|
