Mode I fracture initiation in limestone by strain energy density criterion
- 作者：M.R. Ayatollahi ; m.ayat@iust.ac.ir ; Karo Sedighiani karosedighiani@gmail.com
- 关键词：Minimum strain energy density criterion ; Brittle materials ; Fracture toughness ; Critical stress intensity factor ; T-stress
- 刊名：Theoretical and Applied Fracture Mechanics
- 出版年：2012
- 期刊代码：174_01678442
- 类别：et
- 出版时间：February, 2012
- 卷：57
- 期：1
- 页码：14-18
- 文件大小：484 K
摘要
The critical mode I stress intensity factor obtained from fracture tests on laboratory specimens is often used as fracture toughness in brittle and quasi-brittle materials. However, considerable variations in the experimental results reported for a given material may suggest the dependency of critical mode I stress intensity factor on the geometry and loading conditions of the test specimen. The main purpose of this paper is to study the effect of T-stress on the critical mode I stress intensity factor of brittle and quasi-brittle materials. The minimum strain energy density criterion was revisited to take the effect of T-stress into account. The results obtained were then compared with a series of experimental results reported for limestone. It is shown as a result that the formulation presented in this paper is capable of estimating the experimental results in a satisfactory manner.