Brittle failure criteria for components containing U-notches under Mode I loading
| Autor: | Kuniharu Ushijima, Dai-Heng Chen, Wesley J. Cantwell |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Characteristic length Mechanical Engineering 0211 other engineering and technologies Mode (statistics) 02 engineering and technology Stress (mechanics) 020303 mechanical engineering & transports Fracture toughness Brittleness 0203 mechanical engineering Mechanics of Materials Ultimate tensile strength Fracture (geology) Ultimate stress General Materials Science Composite material 021101 geological & geomatics engineering |
| Zdroj: | Engineering Fracture Mechanics. 200:86-103 |
| ISSN: | 0013-7944 |
| DOI: | 10.1016/j.engfracmech.2018.07.017 |
| Popis: | In this study, a modified fracture criterion which satisfies the necessary stress and energy conditions is proposed for brittle materials. The criterion is based on the assumption that fracture is generated by the initiation of a crack with a finite length l cm . In the proposed criterion, it is assumed that the crack length l cm is an intrinsic material parameter, with a value between 0.8 d 0 m ⩽ l cm ⩽ d 0 m ( = 2 ( K IC / σ C ) 2 / π ) . Here, d 0 m is the characteristic length used in the mean stress criterion, and K IC and σ C are the fracture toughness and the tensile strength for the considered material, respectively. The stress and energy conditions for estimating the brittle fracture behaviour can be fulfilled progressively not simultaneously. However, both conditions must ultimately be fulfilled. Following tests on brittle materials, it has been shown that the predicted values of ultimate stress, based on the necessary stress and energy conditions, agree well with the experimental data. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect