Characterization of the 7475 Aluminium Alloy's Constitutive Behaviour

Abstract

Aluminium alloys' high ratio of strength to weight and excellent fracture toughness have led to a sharp increase in their application in the aerospace and military sectors during the last several decades. It is necessary to conduct a thorough examination of the mechanical behaviour of aluminium alloys at elevated temperature and strain rate in order to forecast how structural elements will react to various severe loading scenarios, such as crashes and impacts. The impact of the process factors on the measurement of thermal-mechanical characteristics of aluminium alloys is crucial for the effective production of aluminium alloy panel components during hot forming. This research fully studied the thermal-mechanical characteristics of 7475 aluminium alloy sheets over hot forming circumstances. The investigation included conducting a variety of iso-thermal uniaxial tensile experiments at various temperatures and strain rates using an isothermal mechanical simulator i.e., Gleeble 3500. The split Hopkinson tensile bar (SHTB), the high velocity testing system, and the electronic universal testing machine were used in order to conduct test of dynamic tensile strength performed on the aluminium alloy 7475. These tests were conducted in order to assess the dynamic mechanical behaviours of the alloy at different strain rates. These stress–strain curves were collected at a variety of different speeds. The findings signify that the strain rate, hardening impact of the aluminium alloy 7475 contributes significantly to the overall impact. Through the modification of the strain rate hardening term inside the Johnson–Cook constitutive model of the 7475 aluminium alloy was successfully generated.