08.2021.158.169

Cracks Length of Aa7075 Measurement Under Electrical Potential Drop Technique

Author(s):

Marwa S. Mahammed*, Saad T. Faris

Affiliation(s):

Department of Mechanical Engineering, College of Engineering, University of Diyala, 32001 Diyala, Iraq

Corresponding Author Email: eng_grand-mech022@gmail.com

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

In the application of linear elastic fracture mechanics (LEFM) theory to practice, the stress intensity factor (SIF) is the most important element. It’s useful for determining if a machine or structural component with a fracture is safe or reliable. It allows you to calculate the crack development rate of a component under fatigue loading, stress corrosion, and other conditions. The primary experimental results for fatigue fracture identification utilizing the Electrical Potential Drop methodology (EPD) under constant load amplitude are presented in this work. Using flat fatigue specimens made of aluminum alloy 7075-T6, the potential drop electrical circuit was conceived, produced, and tested. The experimental findings revealed that the electrical potential drop circuit was capable of detecting the fatigue crack during the test and that the crack length findings were good when compared to the real lengths for fatigue long cracks. The majority of cracks were found in an experiment by measuring crack length after 20% of total fatigue life, so that the remaining fatigue life was > 70%Long cracks or fracture propagation are the most common types of cracks. The goal of this study is to apply the EPD technique to analyze cracks, then extract the S-N curve and compare it to the fatigue test device’s results.