A Numerical and Experimental Investigation of Void Coalescence Causing Ductile Fracture

A series of experiments and finite-element simulations were performed in order to assess existing void coalescence criteria and propose a new model for the coalescence of cylindrical holes in a pure metal matrix during uniaxial stretching. The finite-element simulations were performed so that variou...

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Main Author: Griffin, Joel Sterling
Other Authors: University of New Brunswick, Faculty of Engineering
Language:en
Published: Fredericton: University of New Brunswick 2012
Subjects:
Online Access:http://hdl.handle.net/1882/36784
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spelling ndltd-LACETR-oai-collectionscanada.gc.ca-UNB.1882-367842013-10-22T03:48:43ZA Numerical and Experimental Investigation of Void Coalescence Causing Ductile FractureGriffin, Joel Sterlingductile fracturevoid coalescencedigital imagedigital image correlationplastic limit-loadcylindrical holesA series of experiments and finite-element simulations were performed in order to assess existing void coalescence criteria and propose a new model for the coalescence of cylindrical holes in a pure metal matrix during uniaxial stretching. The finite-element simulations were performed so that various plastic limit-load models could be evaluated at each strain increment during deformation, rendering predictions concerning the farfield strains required for coalescence. The experiments were performed in order to identify the actual far-field strain at the moment of incipient coalescence for the specimen geometries considered. The cylindrical-void models of Thomason (1990) and McClintock (1966) outperformed all of the other considered models in their original states. A modified form of the Ragab (2004) plastic limit-load model is proposed in the present work and is shown to have good agreement with the experimental results. The present model accounts for ligament work-hardening and ligament orientation.Fredericton: University of New BrunswickUniversity of New Brunswick, Faculty of Engineering2012-04-20T16:36:35Z2012-04-20T16:36:35Z2012-04-20Thesis or Dissertationhttp://hdl.handle.net/1882/36784en
collection NDLTD
language en
sources NDLTD
topic ductile fracture
void coalescence
digital image
digital image correlation
plastic limit-load
cylindrical holes
spellingShingle ductile fracture
void coalescence
digital image
digital image correlation
plastic limit-load
cylindrical holes
Griffin, Joel Sterling
A Numerical and Experimental Investigation of Void Coalescence Causing Ductile Fracture
description A series of experiments and finite-element simulations were performed in order to assess existing void coalescence criteria and propose a new model for the coalescence of cylindrical holes in a pure metal matrix during uniaxial stretching. The finite-element simulations were performed so that various plastic limit-load models could be evaluated at each strain increment during deformation, rendering predictions concerning the farfield strains required for coalescence. The experiments were performed in order to identify the actual far-field strain at the moment of incipient coalescence for the specimen geometries considered. The cylindrical-void models of Thomason (1990) and McClintock (1966) outperformed all of the other considered models in their original states. A modified form of the Ragab (2004) plastic limit-load model is proposed in the present work and is shown to have good agreement with the experimental results. The present model accounts for ligament work-hardening and ligament orientation.
author2 University of New Brunswick, Faculty of Engineering
author_facet University of New Brunswick, Faculty of Engineering
Griffin, Joel Sterling
author Griffin, Joel Sterling
author_sort Griffin, Joel Sterling
title A Numerical and Experimental Investigation of Void Coalescence Causing Ductile Fracture
title_short A Numerical and Experimental Investigation of Void Coalescence Causing Ductile Fracture
title_full A Numerical and Experimental Investigation of Void Coalescence Causing Ductile Fracture
title_fullStr A Numerical and Experimental Investigation of Void Coalescence Causing Ductile Fracture
title_full_unstemmed A Numerical and Experimental Investigation of Void Coalescence Causing Ductile Fracture
title_sort numerical and experimental investigation of void coalescence causing ductile fracture
publisher Fredericton: University of New Brunswick
publishDate 2012
url http://hdl.handle.net/1882/36784
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