Correlation between Microstructure and Mechanical Properties of 6063-O Aluminum Alloy and IS 2062 Mild Steel under High
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JMEPEG (2020) 29:5409–5419 https://doi.org/10.1007/s11665-020-05012-4
Correlation between Microstructure and Mechanical Properties of 6063-O Aluminum Alloy and IS 2062 Mild Steel under High Strain Rate Shear Loadings Vikas Saini, Jayaram R. Pothnis, Hemendra Arya, Chandra Sekher Yerramalli
, and N.K. Naik
(Submitted July 26, 2019; in revised form July 7, 2020; published online August 12, 2020) An experimental study for the characterization of 6063-O aluminum alloy and IS 2062 mild steel materials under high strain rate shear loading was conducted. A microstructural study of the tested samples was performed to understand the correlation between the microstructure and mechanical properties. Aluminum alloy 6063-O and IS 2062 mild steel specimens were subjected to shear strain rates in the range of 120-200 and 100-280 s21, respectively. An enhancement in the shear strength is observed for both the materials tested at high strain rates. The microstructural study on the fracture surfaces of the aluminum alloy and the mild steel test coupons was carried out using scanning electron microscopy (SEM). Grain size refinement was observed with increasing strain rate indicating a strong dependence of mechanical properties on the grain size evolution during testing. Changes in microstructural properties at different shear strain rates and its effect on the mechanical properties are presented. Keywords
dynamic shear strength, high strain rate shear testing, microstructure, scanning electron microscope, torsional split Hopkinson bar
1. Introduction The study of material behavior under different loading conditions has been a subject of interest for several decades. The prime reason for such studies is to know the capability and reliability of a material to meet an intended application. Earlier efforts were more toward characterizing material behavior under quasi-static loading conditions. The subsequent studies have focused on analyzing dynamic behavior of materials. The use of quasi-static properties to design materials and structures subjected to high strain rate loading could lead to suboptimal design of structural components. Hence, there is a requirement to understand the material behavior under dynamic loading conditions. The microstructural studies on metals are well documented under quasi-static loading conditions. Mechanical properties of metals are affected by grain size or average grain diameters (Ref 1). The property enhancement is attributed to the increased number of boundary interfaces and the consequent increase in the surface area in a microstructure comprising of smaller grains. In addition, metals display an increase in strength with higher rates of loading. Thus, it becomes important to
Vikas Saini, Hemendra Arya, Chandra Sekher Yerramalli, and N.K. Naik, Aerospace Engineering Department, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India; and Jayaram R. Pothnis, Aerospace Engineering Department, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India; and Aerospace Engineering Dep
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