Fracture toughness of polycrystalline tungsten under mode I and mixed mode I/II loading

Autor:	J Riedle, R.W Margevicius, Peter Gumbsch
Rok vydání:	1999
Předmět:	Strain energy release rate Materials science Mechanical Engineering Metallurgy Transgranular fracture Condensed Matter Physics Microstructure Intergranular fracture Fracture toughness Mechanics of Materials General Materials Science Grain boundary Crystallite Composite material Single crystal
Zdroj:	Materials Science and Engineering: A. 270:197-209
ISSN:	0921-5093
DOI:	10.1016/s0921-5093(99)00252-x
Popis:	The fracture toughness of swaged polycrystalline tungsten was tested parallel and perpendicular to the swaging direction and under mixed mode I/mode II loading. The fracture mode is dominated by the microstructure and changed from all-transgranular cleavage in mode I to almost all-intergranular fracture in mode II. The mixed mode results can be related to two common failure criteria, the maximum tensile stress criterion (Maximum σ) and the maximum energy release rate criterion (Maximum G), but the large scatter in the data prohibits a clear distinction between the two criteria. Tests at 77 K show that the polycrystal is significantly tougher than the single crystal at this temperature. This is a consequence of the deflection of the crack into the grain boundaries and the imperfect texture (as compared to a single crystal) of the polycrystalline material.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4447867129bf11475342d1613aa6f104 https://doi.org/10.1016/s0921-5093(99)00252-x Zobrazit plný text záznamu Full Text from ScienceDirect