The Impact of Dwell Time on the Brinell Hardness Test Behavior of ASTM-A36 Steel: Implications for Safety and Cost Efficiency

Abstract

Material hardness is crucial for human safety, as it ensures the durability and reliability of components in critical applications such as transportation, infrastructure, and medical devices. This research focused on meticulously examining the impact of dwell time on the Brinell Hardness Number (BHN) of ASTM-A36 steel, explicitly studying how BHN changes with different dwell times. The test is significant for assessing local mechanical properties, providing valuable insights through macro indentation tests. These tests are particularly relevant during the dwell time of the indentation procedure. A modern hardness tester, capable of varying dwell time over a broad range, was employed for this study. The research investigated the effects under both with-friction and without-friction conditions. Results revealed that the Brinell Hardness Value decreases with increasing dwell time during macro indentation testing. Notably, Brinell Hardness Values were higher in the without-friction condition than the with-friction condition. This highlights the influence of friction in hardness measurements. The study strongly advises that dwell time be explicitly specified in hardness measurements to ensure accuracy and reliability. By understanding the relationship between dwell time and BHN, this research provides critical insights into the local mechanical properties of materials. This understanding is essential for applications where material performance is vital for safety and functionality. The findings underscore the importance of controlled testing conditions and precise measurement protocols in material hardness, contributing to safer and more reliable engineering practices.