Comparison between 2D and 3D magnification factor of non-load-carrying fillet welded joints

This project aims to investigate the stress intensity factor for surface cracks of several double T-butts models. The project is consisted by three main phases. Phase 1 of the study involves the boundary element modelling of a simple 3-D model using AutoCAD. After extracting all relative parameter...

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Main Author: Xu, Chenxiang.
Other Authors: Lie Seng Tjhen
Format: Final Year Project
Language:English
Published: 2010
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Online Access:http://hdl.handle.net/10356/39772
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-397722023-03-03T17:14:30Z Comparison between 2D and 3D magnification factor of non-load-carrying fillet welded joints Xu, Chenxiang. Lie Seng Tjhen School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Structures and design This project aims to investigate the stress intensity factor for surface cracks of several double T-butts models. The project is consisted by three main phases. Phase 1 of the study involves the boundary element modelling of a simple 3-D model using AutoCAD. After extracting all relative parameters including the sequence of the eight nodes in the elements and the coordinates of the nodes, the BEM_J.exe is used as the numerical solver to calculate the stress intensity factors values. The results of stress intensity factors generated from the boundary element method were then compared towards the calculated stress intensity factor using the exact solution formula and finally calculate the Mk. Phase 2 of this project includes writing a C program to extract the parameters instead of doing manually as same as in phase 1, so that the left complex models can be analysed in a short time. Phase 3 will be the main phase of this project. After generating the C program, 3 batches of models will be tested. Models are categorized according to the relationship between the crack length and the plate thickness. The effect of weld leg length to the stress intensity factor will be studied after the test. The objective of 2D approximation compared to 3D modelling solutions is compared after all models are completed and the buffer and differences between the 2 is established. The stress intensity factors obtained from the double T-butt boundary element model demonstrated that the larger the thickness of the attachment plate, the larger magnitude of stress intensity factors. Furthermore, the stress intensity factors obtained from the test can be concluded to be well-agreeable compared with exact stress intensity factor obtain from the derived equations. The project is consisted by three main phases. Phase 1 of the study involves the boundary element modelling of a simple 3-D model using AutoCAD. After extracting all relative parameters including the sequence of the eight nodes in the elements and the coordinates of the nodes, the BEM_J.exe is used as the numerical solver to calculate the stress intensity factors values. The results of stress intensity factors generated from the boundary element method were then compared towards the calculated stress intensity factor using the exact solution formula and finally calculate the Mk. Phase 2 of this project includes writing a C program to extract the parameters instead of doing manually as same as in phase 1, so that the left complex models can be analysed in a short time. Phase 3 will be the main phase of this project. After generating the C program, 3 batches of models will be tested. Models are categorized according to the relationship between the crack length and the plate thickness. The effect of weld leg length to the stress intensity factor will be studied after the test. The objective of 2D approximation compared to 3D modelling solutions is compared after all models are completed and the buffer and differences between the 2 is established. The stress intensity factors obtained from the double T-butt boundary element model demonstrated that the larger the thickness of the attachment plate, the larger magnitude of stress intensity factors. Furthermore, the stress intensity factors obtained from the test can be concluded to be well-agreeable compared with exact stress intensity factor obtain from the derived equations. Bachelor of Engineering (Civil) 2010-06-04T01:39:24Z 2010-06-04T01:39:24Z 2010 2010 Final Year Project (FYP) http://hdl.handle.net/10356/39772 en Nanyang Technological University 91 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering::Structures and design
spellingShingle DRNTU::Engineering::Civil engineering::Structures and design
Xu, Chenxiang.
Comparison between 2D and 3D magnification factor of non-load-carrying fillet welded joints
description This project aims to investigate the stress intensity factor for surface cracks of several double T-butts models. The project is consisted by three main phases. Phase 1 of the study involves the boundary element modelling of a simple 3-D model using AutoCAD. After extracting all relative parameters including the sequence of the eight nodes in the elements and the coordinates of the nodes, the BEM_J.exe is used as the numerical solver to calculate the stress intensity factors values. The results of stress intensity factors generated from the boundary element method were then compared towards the calculated stress intensity factor using the exact solution formula and finally calculate the Mk. Phase 2 of this project includes writing a C program to extract the parameters instead of doing manually as same as in phase 1, so that the left complex models can be analysed in a short time. Phase 3 will be the main phase of this project. After generating the C program, 3 batches of models will be tested. Models are categorized according to the relationship between the crack length and the plate thickness. The effect of weld leg length to the stress intensity factor will be studied after the test. The objective of 2D approximation compared to 3D modelling solutions is compared after all models are completed and the buffer and differences between the 2 is established. The stress intensity factors obtained from the double T-butt boundary element model demonstrated that the larger the thickness of the attachment plate, the larger magnitude of stress intensity factors. Furthermore, the stress intensity factors obtained from the test can be concluded to be well-agreeable compared with exact stress intensity factor obtain from the derived equations. The project is consisted by three main phases. Phase 1 of the study involves the boundary element modelling of a simple 3-D model using AutoCAD. After extracting all relative parameters including the sequence of the eight nodes in the elements and the coordinates of the nodes, the BEM_J.exe is used as the numerical solver to calculate the stress intensity factors values. The results of stress intensity factors generated from the boundary element method were then compared towards the calculated stress intensity factor using the exact solution formula and finally calculate the Mk. Phase 2 of this project includes writing a C program to extract the parameters instead of doing manually as same as in phase 1, so that the left complex models can be analysed in a short time. Phase 3 will be the main phase of this project. After generating the C program, 3 batches of models will be tested. Models are categorized according to the relationship between the crack length and the plate thickness. The effect of weld leg length to the stress intensity factor will be studied after the test. The objective of 2D approximation compared to 3D modelling solutions is compared after all models are completed and the buffer and differences between the 2 is established. The stress intensity factors obtained from the double T-butt boundary element model demonstrated that the larger the thickness of the attachment plate, the larger magnitude of stress intensity factors. Furthermore, the stress intensity factors obtained from the test can be concluded to be well-agreeable compared with exact stress intensity factor obtain from the derived equations.
author2 Lie Seng Tjhen
author_facet Lie Seng Tjhen
Xu, Chenxiang.
format Final Year Project
author Xu, Chenxiang.
author_sort Xu, Chenxiang.
title Comparison between 2D and 3D magnification factor of non-load-carrying fillet welded joints
title_short Comparison between 2D and 3D magnification factor of non-load-carrying fillet welded joints
title_full Comparison between 2D and 3D magnification factor of non-load-carrying fillet welded joints
title_fullStr Comparison between 2D and 3D magnification factor of non-load-carrying fillet welded joints
title_full_unstemmed Comparison between 2D and 3D magnification factor of non-load-carrying fillet welded joints
title_sort comparison between 2d and 3d magnification factor of non-load-carrying fillet welded joints
publishDate 2010
url http://hdl.handle.net/10356/39772
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