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Title:Moving cohesive interface model for fracture in creeping material
Author(s):Carranza, Fernando L.; Fang, Biao; Haber, Robert B.
Subject(s):Cohesive Interface Model
Creeping Materials
Abstract:We present a new cohesive interface model for quasi-static creep crack growth that is implemented within a moving-grid finite element model. A pseudo crack tip separates the coheisve process zone from the free surfaces of the crack. The moving-grid formulation models continous crack advance by describing relative motion between the pseudo crack tip and the material. This eliminates the need for extensive mesh refinement away from the current crack-tip location and supports both transient and direct steady-state solutions. A traction-separation law determines the energetic properties of the decohesion process and generates a simple criterion for crack advance. The new formulation remedies a problem in earlier models which permit a crack to heal on unloading. Numerical examples demonstrate the moving cohesive interface model in studies of steady-state crack growth. Adaptive grid refinement is used to control the accuracy of the solution.
Issue Date:1996-11
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 837
Genre:Technical Report
Sponsor:National Aeronautics & Space Administration 96/11 NGT 70374 96/11
Rights Information:Copyright 1996 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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