“In this study, the analysis of elastic fracture mechanics has been directed at identifying certain fracture parameters such as the strain energy release rate, crack opening displacement and critical stress at the crack tip. The study of quasi-static crack propagation has been carried out by presenting different traction separation laws developed, that are used to describe the failure criteria at the crack tip. A detailed analysis of the Barenblatt-Dugdale model is given which shows the non-linear force- displacement relations existing at the interface of the crack. The traction separation law used in this analysis is a part of the Needleman cohesive zone model. This analysis was done on a foundation appropriate to a double cantilever beam specimen whose material is elastic with the non-linear material confined to the cohesive zone. The analysis indicated that it is possible to model the non-linear behavior of the cohesive zone during fracture separation. The traction separation law was incorporated into the NOVA-3D finite element analysis code, which was then used to simulate Mode-I fracture in different specimens using different loading conditions. Analysis of quasi-static fracture was also conducted using routines developed in ABAQUS finite element code, which were then provided as a comparison to the results obtained from NOVA-3D. The ABAQUS routines developed employed a row of non-linear spring elements, which was used to model the behavior of the cohesive zone. The effect of the intensity of these elements around the crack tip on the solution was studied. The modified crack closure integral was used to calculate the strain energy release rate at each crack length increment”--Abstract, page iii.
Dharani, Lokeswarappa R.
Stone, Robert B.
Mechanical and Aerospace Engineering
M.S. in Mechanical Engineering
University of Missouri--Rolla
ix, 70 pages
© 2000 Uday Idnani, All rights reserved.
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Idnani, Uday, "Cohesive zone modeling of quasi-static crack growth in two dimensional cracked specimens" (2000). Masters Theses. 2001.
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