Fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction

Multiple cracks with different or similar geometries that coexist on the same plane will affect its neighbouring counterpart’s Stress Intensity Factor (SIF) value due to interaction effect. The interaction effect is much related to the change of stress distribution profile that produced by neighbo...

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Main Author:	Ahmad Faizal, Annuar
Format:	Thesis
Language:	English
Subjects:	Cracks Stress Intensity Factor (SIF) Fracture mechanic analysis Fracture > Analysis Kerf
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61536/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61536/2/Full%20text.pdf
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spelling	my-unimap-615362019-08-23T09:40:59Z Fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction Ahmad Faizal, Annuar Dr. Muhamad Saifuldin Abdul Manan Multiple cracks with different or similar geometries that coexist on the same plane will affect its neighbouring counterpart’s Stress Intensity Factor (SIF) value due to interaction effect. The interaction effect is much related to the change of stress distribution profile that produced by neighbouring crack. The study had been proven true over the past years through various Finite Element Analysis FEA software packages and formulation, but an actual experiment and raw data acquisition is rather scarce in literature. This could well mean that the process to prepare multiple cracks study is hard to emulate physically as oppose to single crack study. The main intention of this study attempts to simulate and find a possibility to replace subsequent crack interaction to primary crack with kerf, incise in Electric Discharge Machining (WEDM) wire cut, by evaluating the longitudinal stress distribution component. Current regional technology of WEDM permits kerf gap machining at 0.050mm. This research, focuses on emulating two parallel edge cracks’ interaction as initial attempt to prove that kerf provides similar interaction on primary crack’s SIF. Through simulation using ABAQUS Computer Aided Engineering (CAE), values of non-uniform stress distributions produced by kerf within the potential primary crack region was analysed and compared to non-uniform stress distributions that produced by a crack as validation. Absolute error tabulation of stress distribution that produced by kerf suggests that it is fit to replace subsequent crack for further study of interaction in multiple cracks. A nonconventional method to determine Normalised SIF of crack, , using Multiple Reference State (MRS) Weight Function was chosen given its capability in complex computation of crack geometries that includes non-uniform stress distribution values in finite bodies. The values from FEA models of double edge cracks which were used as reference points exhibits decent agreement with data trend line from those conceived by MRS Weight Function Method. Experiments are carried out with three (3) specimens, made from Aluminium Alloy 6063 T6, which contains a crack, a, at varying length and 10mm kerf, b, each at similar edge surface at similar separation of 10mm to observe further growth of crack under presence of kerf. The three conditions of the specimens are designed as followed; i) a≈b, ii) a=1.5b, and iii) a=2b. This is to highlight the existence of interaction between crack and kerf under circumstance where primary crack at different conditions attempts to grow under loading. This research contributes the knowledge of kerf’s non-uniform stress distribution trend under tension loading and its influence to primary crack’s growth in which the results are comparable to those produced by subsequent crack. The study of kerf in this research is significant as it disclose characteristic of kerf and crack interaction and allows anticipation in the events structural failure for engineers and research in order to avoid potential disasters. Universiti Malaysia Perlis (UniMAP) 2015 Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/61536 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61536/1/Page%201-24.pdf 4a7816be4bc8d5dbf77e6f9b08228b14 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61536/2/Full%20text.pdf cffd19a29469ef9ddb04c9d9a5cae6ea http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61536/3/license.txt 8a4605be74aa9ea9d79846c1fba20a33 Cracks Stress Intensity Factor (SIF) Fracture mechanic analysis Fracture -- Analysis Kerf School of Mechatronic Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
advisor	Dr. Muhamad Saifuldin Abdul Manan
topic	Cracks Stress Intensity Factor (SIF) Fracture mechanic analysis Fracture -- Analysis Kerf
spellingShingle	Cracks Stress Intensity Factor (SIF) Fracture mechanic analysis Fracture -- Analysis Kerf Ahmad Faizal, Annuar Fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction
description	Multiple cracks with different or similar geometries that coexist on the same plane will affect its neighbouring counterpart’s Stress Intensity Factor (SIF) value due to interaction effect. The interaction effect is much related to the change of stress distribution profile that produced by neighbouring crack. The study had been proven true over the past years through various Finite Element Analysis FEA software packages and formulation, but an actual experiment and raw data acquisition is rather scarce in literature. This could well mean that the process to prepare multiple cracks study is hard to emulate physically as oppose to single crack study. The main intention of this study attempts to simulate and find a possibility to replace subsequent crack interaction to primary crack with kerf, incise in Electric Discharge Machining (WEDM) wire cut, by evaluating the longitudinal stress distribution component. Current regional technology of WEDM permits kerf gap machining at 0.050mm. This research, focuses on emulating two parallel edge cracks’ interaction as initial attempt to prove that kerf provides similar interaction on primary crack’s SIF. Through simulation using ABAQUS Computer Aided Engineering (CAE), values of non-uniform stress distributions produced by kerf within the potential primary crack region was analysed and compared to non-uniform stress distributions that produced by a crack as validation. Absolute error tabulation of stress distribution that produced by kerf suggests that it is fit to replace subsequent crack for further study of interaction in multiple cracks. A nonconventional method to determine Normalised SIF of crack, , using Multiple Reference State (MRS) Weight Function was chosen given its capability in complex computation of crack geometries that includes non-uniform stress distribution values in finite bodies. The values from FEA models of double edge cracks which were used as reference points exhibits decent agreement with data trend line from those conceived by MRS Weight Function Method. Experiments are carried out with three (3) specimens, made from Aluminium Alloy 6063 T6, which contains a crack, a, at varying length and 10mm kerf, b, each at similar edge surface at similar separation of 10mm to observe further growth of crack under presence of kerf. The three conditions of the specimens are designed as followed; i) a≈b, ii) a=1.5b, and iii) a=2b. This is to highlight the existence of interaction between crack and kerf under circumstance where primary crack at different conditions attempts to grow under loading. This research contributes the knowledge of kerf’s non-uniform stress distribution trend under tension loading and its influence to primary crack’s growth in which the results are comparable to those produced by subsequent crack. The study of kerf in this research is significant as it disclose characteristic of kerf and crack interaction and allows anticipation in the events structural failure for engineers and research in order to avoid potential disasters.
format	Thesis
author	Ahmad Faizal, Annuar
author_facet	Ahmad Faizal, Annuar
author_sort	Ahmad Faizal, Annuar
title	Fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction
title_short	Fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction
title_full	Fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction
title_fullStr	Fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction
title_full_unstemmed	Fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction
title_sort	fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Mechatronic Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61536/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61536/2/Full%20text.pdf
_version_	1747836843609554944

Fracture mechanic analysis of multiple edge cracks in a finite plate using kerf to emulate crack interaction

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