The Correlation of Texture and the Formation of the Adiabatic Shear Band in 7XXX Aluminum Alloy during Dynamic Loading

Xiaodong Wu,Shiping Wen

doi:10.1155/2021/4022424

Abstract

The mechanical behavior of the extruded 7003-T6 aluminum profiles used as automotive buffer beams is investigated. The correlation of the texture and the formation of the adiabatic shear band is analyzed. Copper texture, R texture, and S texture are the main reasons for the anisotropy of mechanical behavior of the profile, resulting in that the stress of the profile along the extrusion direction is higher than that perpendicular to the extrusion direction. Through finite element modeling (FEM), it can be found that the adiabatic shear band is developed in the sample if the dynamic loading direction is parallel to the extrusion direction, but it does not appear if the loading direction is perpendicular to the extrusion direction. When the dynamic loading direction is parallel to the extrusion direction, higher stress results in a lower energy barrier for shear localization. Therefore, the formation of the adiabatic shear band is susceptible along but is not sensitive perpendicular to the extrusion direction. This study provides technical support for the service of 7003 aluminum alloy in automobiles, which has important academic and engineering application value.

Highlights

Aluminum alloy is an ideal lightweight material for automobiles because of its outstanding energy absorption performance and high specific strength
We studied the mechanical behavior of extruded 7003 aluminum alloys’ profile
We present the results and analysis about the effects of texture on the adiabatic shear band formation

Summary

Introduction

Aluminum alloy is an ideal lightweight material for automobiles because of its outstanding energy absorption performance and high specific strength. More and more high-performance extruded 7XXX series aluminum alloy profiles are applied in the car body, such as 7003 aluminum alloy, as the automotive buffer beams. The material’s impact safety under high-speed impact is especially important for security reasons [1]. It is a major requirement to research the mechanical behavior of. The general driving speed of a car is about 60 km/h, and the speed can reach 120 km/h on the highway; the corresponding strain rate is about 1700 s−1∼3400 s−1. The coupling of mechanical and thermal effects leads to special behavior of materials, such as adiabatic shear band, which is the precursor of fracture failure [2]

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Conclusion