Off-set crack propagation analysis under mixed mode loadings

Ismail, Al Emran and Ariffin, A. K. and Abdullah, S. and Ghazali, M. J. (2011) Off-set crack propagation analysis under mixed mode loadings. International Journal of Automotive Technology, 12 (2). pp. 225-232. ISSN 1229-9138

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Official URL: http://dx.doi.org/10.1007/s12239-011-0027-7

Abstract

An assessment was carried out herein to study the eccentricity of cracks subjected to mixed-mode loadings. Several loading locations relative to a central line were selected to induce mixed-mode loadings, which were computed using a finite element method. An adaptive meshing technique was adopted during the simulation of crack propagation to ensure the singularity of stress at the tip of the crack. The stress intensity failure criterion was used and programmed, and the node splitting technique was used when the stress intensity factor reached the fracture toughness of the material to simulate crack propagations. It was found that large variations m the stress intensity factor were observed when off-set cracks were used, and that K,, decreased when loading distance increased, but increased when the off-set crack distance was increased. Both crack eccentricity and loading distance played important roles in producing mixed-mode loading, compared to the influence of central cracks. Correction factors were introduced to m o w the calculation of stress intensity factors under mixed-mode loadings. Simulations of crack propagation were also conducted to study the effects of crack eccentricities and loading distances. It was found that the crack length, the loading distance relative to the central crack and the crack eccentricity dominated calculations of the integrity of cracked structures.

Item Type:Article
Uncontrolled Keywords:mixed-mode loading; crack eccentxicity; stress intensity factor; crack propagation
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Engineering Mechanics
ID Code:3867
Deposited By:Normajihan Abd. Rahman
Deposited On:25 Jul 2013 15:42
Last Modified:22 Jan 2015 08:40

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