Fracture mechanics analysis of defence hole system for a uniaxially loaded plate using boundary element method

• Main Author: Teo, Jonathan Jit Jon
• Other Authors: Ang Hock Eng
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2024
• Subjects: Engineering
• Online Access: https://hdl.handle.net/10356/177873
• Institution: Nanyang Technological University

The main objective of this report is to analyse the outcome of defence hole systems on a main hole on a uni-axially loaded plate. The study utilises the BIE2DSRE-A computer program, which employs the Boundary-Element-Method (BEM) for stress analysis. The first aspect considered is the stress concentrations around the main hole. By modelling various defence hole systems with different configurations, the aim is to identify the configuration that yields the highest reduction based of the Stress Concentration Factor (SCF). This information will be valuable in designing more robust structures and preventing stress concentration failures. Additionally, the study investigates the stress intensities of cracks emanating from the main hole. Different crack sizes are modelled to determine which defence hole configuration provides the greatest reduction in Stress Intensity Factor (SIF). This knowledge will aid in understanding how defence holes can mitigate crack propagation and improve structural integrity. Furthermore, this study explores the effects of varying auxiliary hole diameters within the defence hole configurations. Unlike previous studies where the auxiliary diameter remained fixed, this research aims to examine how adjusting its size impacts the overall effectiveness of the defence hole system. Understanding these potential advantages and disadvantages will contribute to determining the optimal defence hole configuration. Overall, this report aims to provide insights into how defence hole systems can reduce stress concentrations and stress intensities in a uniaxially loaded plate. The findings will be valuable for engineers and designers seeking to enhance structural performance and prevent failure under load.