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A novel fixture for mixed mode I/II/III fracture testing of brittle materials
Author(s) -
Zeinedini Afshin
Publication year - 2019
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12955
Subject(s) - materials science , fracture toughness , composite material , fixture , stress intensity factor , epoxy , test fixture , brittleness , fracture (geology) , finite element method , mixed mode , envelope (radar) , shear (geology) , stress (linguistics) , structural engineering , tension (geology) , fracture mechanics , ultimate tensile strength , engineering , mechanical engineering , telecommunications , radar , linguistics , philosophy
A novel test‐loading device was suggested in order to study the fracture behavior of brittle materials under mixed mode I/II/III loading conditions. A version of the compact tension shear specimen was used as the test configuration. Using a three‐dimensional finite element analysis, the influence of mode mixity on the stress intensity factors, the T‐stress, and 3‐D plastic zone around the crack tip was investigated. In addition, an experimental study was performed on an epoxy polymer using the proposed setup. Finally, the fracture toughness of pure epoxy was measured under several loading conditions. The numerical and experimental results manifested that the proposed setup is able to determine a full range of mixed mode I/II/III fracture properties. At the end, the fracture envelope obtained using the practical study was compared with various three‐dimensional fracture criteria. A negligible discrepancy was concluded between the practical data and the theoretical data estimated by the maximum mean principle stress criterion.