Mixed mode fracture of a brittle orthotropic material—example of strongly textured zinc sheets

✍ Scribed by F. Lemant; A. Pineau

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 979 KB
• Volume: 14
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(81)90020-5

✦ Synopsis

The response to mixed mode fracture of strongly textured sheets of impure zinc has been investigated using centrally cracked panels tested at 77 K. The specimens were designed such that the crack which was oriented at various angles lo the tensile axis was always parallel to the basal plane direction. In this orthotropic material the strain energy release rate at fracture (G<) is calculated using the analytical results published in the literature. The angular variation of G is calculated using the Nuismer's approximation. It is shown that the energy approach has some limitations as far as the prediction of mixed mode fracture in anisotropic materials is concerned. A local approach in terms of a combination of the resolved normal stress o;, and the resolved shear stress (7) applied :o the basal slip plane is proposed to account for the fracture behavior of this material in mixed mode loading.