Calculation of the crack tip parameters in the holed‐cracked flattened Brazilian disk (HCFBD) specimens under wide range of mixed mode I/II loading

In this paper, the crack tip parameters including the stress intensity factors (KI and KII), T‐stress and the third terms of the stress field (A3 and B3) are determined comprehensively for a disk‐type sample named holed‐cracked flattened Brazilian disk (HCFBD) under various combinations of mode I an...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2017-09, Vol.40 (9), p.1416-1427
Main Authors: Akbardoost, J., Ghadirian, H. R., Sangsefidi, M.
Format: Article
Language:English
Subjects:
Brittle fracture
Brittle materials
finite element analysis
Finite element method
Flattening
Fracture mechanics
Fracture toughness
higher order terms
holed‐cracked flattened Brazilian disk
Mathematical analysis
Size effects
Stress intensity
Stress intensity factors
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Summary:In this paper, the crack tip parameters including the stress intensity factors (KI and KII), T‐stress and the third terms of the stress field (A3 and B3) are determined comprehensively for a disk‐type sample named holed‐cracked flattened Brazilian disk (HCFBD) under various combinations of mode I and mode II loading. The HCFBD specimen is a circular disk containing a central hole in which the initial cracks are created radially from the hole circumference. Moreover, the ends of HCFBD are flattened for the sake of convenient loading. Performing enormous finite element analyses and calculating the stress intensity factors KI and KII, the states of pure mode II are determined for different configurations of HCFBD. Furthermore, the sign and magnitude of parameter A3 which plays an important role to justify the geometry and size effects on the fracture toughness of quasi‐brittle materials are also determined for HCFBD with different geometrical ratios.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.12585