Investigation of Stress Intensity Factor in a Single Edge Notched Bend Test Piece

• Main Author: Mohd Nurul Amin b Adnan, Mohd Nurul Amin
• Format: Final Year Project
• Language: English; English
• Published: Universiti Teknologi Petronas 2009
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://utpedia.utp.edu.my/716/1/Investigation_of_Stress_Intensity_Factor_in_a_Single_Edge_Notch_%28final_report%29.pdf; http://utpedia.utp.edu.my/716/2/Investigation_of_Stress_Intensity_Factor_in_a_Single_Edge_Notch.PDF; http://utpedia.utp.edu.my/716/

A research has been conducted on the title of Investigation of Stress Intensity Factor in Single Edge Notched Bend Test Piece in partial fulfillment of Final Year Project. The research is about comparing empirical analysis and finite element analysis (FEA) in investigating stress intensity factor on the standard bend test piece by referring and following the American Standard of Testing Material (ASTM) Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials (E 399 – 90 – Reapproved 2001). FEA is conducted using ANSYS v.11 Software and analysis used linear elastic fracture mechanics (LEFM) approach with plane strain problem condition and modeled it in half symmetry geometry. FEA and empirical analyses were conducted in order to determine the relation and effect of span length ratio, s/W and thickness to width ratio, B/W with Stress intensity factor, K with respect to crack dept ratio, a/W. The empirical analysis and FEA were conducted to compare and validate the results. By using KCALC command in ANSYS, the procedures and methodology of using the command in the ANSYS have been recorded in step-by-step instruction for further references. Several corrective actions have been taken to reduce the error between analytical and finite element analysis. From the results, stress intensity factor, K is inversely proportional with span length to width ratio, s/W and thickness to width ratio, B/W while it is proportional to the crack length ratio, a/W. There are variations between analytical and empirical and finite element analysis but the error is considerably accepted.