Determination of Johnson–Cook Parameters for Cast Aluminum Alloys

Abstract

A series o f experiments were conducted to determine the John son-Cook parameters for three different cast aluminum alloys, namely, A356, A357, and F357. Room temperature compression experiments were performed under varying rates o f loading rang ing from 10 3 s 1 to 5000 s 1. High temperature compression (235 °C and 435 °C) experiments were performed at an average strain rate o f 5000 s~'. A split Hopkinson pressure bar (SHPB) apparatus was utilized in conjunction with an induction coil heat ing system for applying dynamic loading at elevated temperatures. In addition, experiments were performed under high strain rate tensile loading using tensile SHPB apparatus, and the fractured specimens were examined under scanning electron microscope (SEM) to understand the failure modes in these alloys. High speed photography was used to capture the chronological pro gression o f the deformation under dynamic tensile loading. The results indicated that all the three cast aluminum alloys were sen sitive to strain rate and temperature. A356 exhibited the least value of flow stress under both static and dynamic loading condi tions, and the highest elongation before break under dynamic tensile loading. The SEM images o f the fractured specimens under dynamic tensile loading showed characteristics o f transcrystalline ductile fracture in these cast aluminum alloys.

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