Mixed-mode fracture angle and fracture locus of materials subjected to compressive loading

✍ Scribed by Jehuda Tirosh; Eli Catz

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 750 KB
• Volume: 14
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(81)90017-5

✦ Synopsis

Ah&r&-The incipient fracture angle and fracture loci of prenotched brittle-like material subjected to compressive loading are investigated analytically and experimentally.

The analysis of the problem includes parameters whose effects on fracture were pronounced via laboratory tests, namely: notch-tip curvature, subcritical microcracks emanating from the notch and crack closure process. Such considerations, jointly with the well-established fracture criteria in tensile loading (like the critical energy release rate, the critical energy density, J-integral and critical maximum stress used in this work) yielded an associated fracture locus for each criterion. Due to the mixed mode nature of the situation (K, and &) preevaluation of the fracture angle was instrumental.

Data on critical (far-field) compressive load along with measured fracture angles performed on PMMA and Tungsten Carbide specimens are used to depict the most suitable fracture locus and thus to distinguish between the various fracture criteria when extended to fracture under compressive loading. An exact expression for the threshold load for complete closure of 2D elliptical cracks is used to delimit the fracture locus.