Some crack problems in engineering structures

The failure of engineering structure by cracking is always undesirable. It involves human lives that are put in jeopardy, economic losses and the interference with the availability of products and services. Therefore, an understanding of fracture mechanics is crucial for engineers in designing engin...

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Main Author: Kok, Kheong Shiun.
Other Authors: Xiao Zhongmin
Format: Final Year Project
Language:English
Published: 2009
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Online Access:http://hdl.handle.net/10356/16139
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-161392023-03-04T19:15:47Z Some crack problems in engineering structures Kok, Kheong Shiun. Xiao Zhongmin School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics The failure of engineering structure by cracking is always undesirable. It involves human lives that are put in jeopardy, economic losses and the interference with the availability of products and services. Therefore, an understanding of fracture mechanics is crucial for engineers in designing engineering structure especially those under high tensile stress. The main concept being discussed in this Final Year Report is Stress Intensity Factor, KI, a parameter used for predicting crack growth. The report particularly deals with cracks found in structures with notch. There are 2 different types of crack case being investigated here, namely the Edge Crack case and the Central Crack case. For each of the case, the KI for different crack length are being computed using Finite Element Analysis by ANSYS for 3 different types of engineering structure: a plain sheet structure, a structure containing circular notch and a structure containing an elliptical notch. To date, there are many experiments or analysis done on the behaviour of KI of structure with notch for different crack length over notch radius, a/r. In this report, KI for structure containing circular and elliptical notch is being compare with the KI value of structure without notch. The comparison parameter KI/KI0(where KI0 is the stress intensity factor for structure without notch) is then being plotted on graph for different a/r. All the analysis will be based on the assumptions of Linear Elastic Fracture Mechanics and plane strain problem. The modeling will also be limited to homogeneous, isotropic (near the crack region) material and infinite width sheet structure. Bachelor of Engineering (Mechanical Engineering) 2009-05-21T07:09:24Z 2009-05-21T07:09:24Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/16139 en Nanyang Technological University 100 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::Mechanical engineering::Mechanics and dynamics
spellingShingle DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics
Kok, Kheong Shiun.
Some crack problems in engineering structures
description The failure of engineering structure by cracking is always undesirable. It involves human lives that are put in jeopardy, economic losses and the interference with the availability of products and services. Therefore, an understanding of fracture mechanics is crucial for engineers in designing engineering structure especially those under high tensile stress. The main concept being discussed in this Final Year Report is Stress Intensity Factor, KI, a parameter used for predicting crack growth. The report particularly deals with cracks found in structures with notch. There are 2 different types of crack case being investigated here, namely the Edge Crack case and the Central Crack case. For each of the case, the KI for different crack length are being computed using Finite Element Analysis by ANSYS for 3 different types of engineering structure: a plain sheet structure, a structure containing circular notch and a structure containing an elliptical notch. To date, there are many experiments or analysis done on the behaviour of KI of structure with notch for different crack length over notch radius, a/r. In this report, KI for structure containing circular and elliptical notch is being compare with the KI value of structure without notch. The comparison parameter KI/KI0(where KI0 is the stress intensity factor for structure without notch) is then being plotted on graph for different a/r. All the analysis will be based on the assumptions of Linear Elastic Fracture Mechanics and plane strain problem. The modeling will also be limited to homogeneous, isotropic (near the crack region) material and infinite width sheet structure.
author2 Xiao Zhongmin
author_facet Xiao Zhongmin
Kok, Kheong Shiun.
format Final Year Project
author Kok, Kheong Shiun.
author_sort Kok, Kheong Shiun.
title Some crack problems in engineering structures
title_short Some crack problems in engineering structures
title_full Some crack problems in engineering structures
title_fullStr Some crack problems in engineering structures
title_full_unstemmed Some crack problems in engineering structures
title_sort some crack problems in engineering structures
publishDate 2009
url http://hdl.handle.net/10356/16139
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