Finite element on determination of geometric correction factor for linear fracture mechanics

In the context of fracture mechanics, geometric correction factor is an important factor that account for various geometries and crack configurations. The purpose of this report is to investigate the geometric correction factor for finite geometries that contains various crack configurations and loa...

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Main Author: Teo, Jian Yuan
Other Authors: Sellakkutti Rajendran
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2023
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Online Access:https://hdl.handle.net/10356/166750
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1667502023-05-13T16:51:51Z Finite element on determination of geometric correction factor for linear fracture mechanics Teo, Jian Yuan Sellakkutti Rajendran School of Mechanical and Aerospace Engineering MSRajendran@ntu.edu.sg Engineering::Mechanical engineering In the context of fracture mechanics, geometric correction factor is an important factor that account for various geometries and crack configurations. The purpose of this report is to investigate the geometric correction factor for finite geometries that contains various crack configurations and loadings. Types of crack configurations include center crack, single-edge crack, and double-edge crack. In this final year project, finite element analysis is used to determine the stress intensity factor at the crack tip for the stated crack configurations. Subsequently, minor calculations are made to obtain geometric correction factor. The student version of ANSYS Mechanical APDL is used for the finite element analysis. Methodology of modelling various geometries and crack configurations are also provided in this report. A critical comparison of geometric correction factor generated using FEM versus the values predicted by empirical formulas is also presented. The computed values of geometric correction factors based on most of the empirical formulas available in the literature are close to that of FEM. Furthermore, as there is very little research that accounts for the height of the plate, analyses are conducted to understand its effect on geometric correction factor as the height and width ratio changes. The geometric correction factor increases with increase in crack length for all fracture problems considered in this project except the double-edge crack problem. In addition, as the height and width ratio increase, the geometric correction factor decreases. Apart from that, a comparison between 8-node quarter point elements and conventional elements is also presented to determine which yields accurate value of stress intensity factor for one of the fracture problems. In this case, the conventional elements yield better results. Bachelor of Engineering (Mechanical Engineering) 2023-05-12T12:14:59Z 2023-05-12T12:14:59Z 2023 Final Year Project (FYP) Teo, J. Y. (2023). Finite element on determination of geometric correction factor for linear fracture mechanics. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/166750 https://hdl.handle.net/10356/166750 en B214 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
spellingShingle Engineering::Mechanical engineering
Teo, Jian Yuan
Finite element on determination of geometric correction factor for linear fracture mechanics
description In the context of fracture mechanics, geometric correction factor is an important factor that account for various geometries and crack configurations. The purpose of this report is to investigate the geometric correction factor for finite geometries that contains various crack configurations and loadings. Types of crack configurations include center crack, single-edge crack, and double-edge crack. In this final year project, finite element analysis is used to determine the stress intensity factor at the crack tip for the stated crack configurations. Subsequently, minor calculations are made to obtain geometric correction factor. The student version of ANSYS Mechanical APDL is used for the finite element analysis. Methodology of modelling various geometries and crack configurations are also provided in this report. A critical comparison of geometric correction factor generated using FEM versus the values predicted by empirical formulas is also presented. The computed values of geometric correction factors based on most of the empirical formulas available in the literature are close to that of FEM. Furthermore, as there is very little research that accounts for the height of the plate, analyses are conducted to understand its effect on geometric correction factor as the height and width ratio changes. The geometric correction factor increases with increase in crack length for all fracture problems considered in this project except the double-edge crack problem. In addition, as the height and width ratio increase, the geometric correction factor decreases. Apart from that, a comparison between 8-node quarter point elements and conventional elements is also presented to determine which yields accurate value of stress intensity factor for one of the fracture problems. In this case, the conventional elements yield better results.
author2 Sellakkutti Rajendran
author_facet Sellakkutti Rajendran
Teo, Jian Yuan
format Final Year Project
author Teo, Jian Yuan
author_sort Teo, Jian Yuan
title Finite element on determination of geometric correction factor for linear fracture mechanics
title_short Finite element on determination of geometric correction factor for linear fracture mechanics
title_full Finite element on determination of geometric correction factor for linear fracture mechanics
title_fullStr Finite element on determination of geometric correction factor for linear fracture mechanics
title_full_unstemmed Finite element on determination of geometric correction factor for linear fracture mechanics
title_sort finite element on determination of geometric correction factor for linear fracture mechanics
publisher Nanyang Technological University
publishDate 2023
url https://hdl.handle.net/10356/166750
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