Analysis of the strain induced martensitic transformation in austenitic steel subjected to dynamic perforation

J.A Rodríguez-Martínez,A Rusinek,R Zaera,R Pesci

doi:10.1051/epjconf/20122604036

Abstract

An experimental and numerical analysis on the martensitic transformation in AISI 304 steel sheets subjected to perforation by conical and hemispherical projectiles is reported. Two target thicknesses are considered, 0.5 and 1.0 mm, and impact velocities range from 35 to 200 m/s. The perforation mechanisms are identified and the effect of the projectile nose-shape on the ability of the target for energy absorption is evaluated. Martensite has been detected in all the impacted samples and the role played by the projectile nose-shape on the transformation is highlighted. A 3D model implemented in ABAQUS/Explicit allowed to simulate the perforation tests. The material is defined through a constitutive description developed by the authors to describe the strain induced martensitic transformation taking place in metastable austenitic steels at high strain rates. The numerical results are compared with the experimental evidence and satisfactory matching is obtained. The numerical model succeeds in describing the perforation mechanisms associated to each projectile-target configuration analysed.

Highlights

Steel sheets are cost-efficient and affordable materials, with valuable properties for the industry
An experimental and numerical analysis on the martensitic transformation in AISI 304 steel sheets subjected to perforation by conical and hemispherical projectiles is reported
The material is defined through a constitutive description developed by the authors to describe the strain induced martensitic transformation taking place in metastable austenitic steels at high strain rates

Summary

Introduction

Steel sheets are cost-efficient and affordable materials, with valuable properties for the industry. Conical strikers cause failure through radial cracking tearing out into a number of petals, their number increasing with impact velocity and projectile nose angle. A few of them [2, 3] consider metastable austenitic steel alloys exhibiting Strain Induced Martensitic Transformation (SIMT). This work presents an experimental and numerical analysis on the martensitic transformation in AISI 304 steel sheets subjected to perforation by conical and hemispherical projectiles. The AISI 304 is considered as the reference metastable austenitic stainless steel for studying the SIMT

Experimental results

F Material target

Conclusions