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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Fredericton: University of New Brunswick
2012
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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 |
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en |
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topic |
ductile fracture void coalescence digital image digital image correlation plastic limit-load cylindrical holes |
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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 |
work_keys_str_mv |
AT griffinjoelsterling anumericalandexperimentalinvestigationofvoidcoalescencecausingductilefracture AT griffinjoelsterling numericalandexperimentalinvestigationofvoidcoalescencecausingductilefracture |
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1716608447553732608 |