Deformation of Stacked Metallic Sheets by Shock Wave Loading

Sandeep Patil,Bernd Markert,Rahul Murkute,Nima Shirafkan

doi:10.3390/met8090679

Sandeep Patil, Bernd Markert + Show 2 more

Open Access

https://doi.org/10.3390/met8090679

Copy DOI

Abstract

The focus of the present work is to develop a deep understanding of deformation of stacked metal sheets with a series of different sequences by using shock wave loading. Here, experimental and numerical investigations of deformation of a single metal sheet of 1.5-mm and the stack of three metal sheets of 0.5-mm thickness of aluminum (Al), copper (Cu) and brass (Br) material were carried out. In the shock wave experiments, helium was used as the driving gas to produce a strong shock wave. Finite elements method (FEM) simulations on 3D-computational models were performed with explicit dynamic analysis, and Johnson-Cook material model was used. The obtained results from experiments of the outer diameter, thickness distribution, and dome height were analyzed and compared with the numerical simulations, and both the results are in excellent agreement. Moreover, for the same pressure load, due to lower inter-metallic friction in the stacked sheets compared to a cohesive property of the single sheet, an excellent deformation of stacked metallic sheets was observed. The results of this work indicated that the shock wave-forming process is a feasible technique for mass production of stacked metallic sheets as well as fabricating a hierarchical composite structure, which provides higher formability and smooth thickness distribution compared to a single material.

Highlights

High-speed forming is a widely investigated technique, which refers to a forming process whereby the workpiece material experiences the high forming speed of up to several hundred meters per second.In high-speed forming processes, such as explosive, gas detonation, electromagnetic, electrohydraulic and shock tube forming, a plate is plastically deformed by means of high kinetic energy
Shock tube consists of a high-pressure chamber (HPC), which can be filled with different gases, and a low-pressure chamber (LPC), which is separated from the HPC by a membrane
The stacked metal sheets of aluminum of 0.5-mm thickness have excellent formability and smoothness in thickness, strain and stress distributions compared to a single sheet of 1.5-mm thickness

Summary

Introduction

In high-speed forming processes, such as explosive, gas detonation, electromagnetic, electrohydraulic and shock tube forming, a plate is plastically deformed by means of high kinetic energy. These modern techniques provide productive usage of material, energy sources and minimize the problem which comes around in the formation of a sheet metal [1]. Due to sudden changes in velocity and pressure, the shock wave gained effective usage and application in an area such as physics, chemistry, materials science, engineering, military technology, medicine, and several other areas [3,4].

Objectives

Methods

Results

Conclusion