Tensile and compressive behaviour of S355 mild steel in a wide range of strain rates

Ezio Cadoni,Leopold Kruszka,Roman Gieleta,Daniele Forni

doi:10.1140/epjst/e2018-00113-4

Abstract

This paper presents a comparison between mechanical compressive and tensile properties of S355 structural (mild) steel in a wide range of strain rates. A split Hopkinson pressure bar apparatus is used to investigate the dynamic compressive behaviour at high strain rates (740–5880 s−1). A hydro-pneumatic machine (5–25 s−1) and a modified split Hopkinson tensile bar apparatus (300–850 s−1) are used to study the strain rate sensitivity under dynamic tension. Quasi-static tensile and compressive tests are conducted on a universal electromechanical testing machine. The model parameters of two commonly used constitutive equations (Johnson–Cook and Cowper–Symonds) are also compared, separately for each model during compression and tension deformations.

Highlights

A detailed knowledge of the mechanical properties of low-carbon mild steels at different strain rates is crucial, because these steels are the most commonly used in several fields, such as, automotive, aerospace, building construction as well as off-shore structures.The European Physical Journal Special Topics to compare the mechanical compressive and tensile properties of the S355 structural steel in a wide range of strain rates
The results of the experimental investigations for the S355 structural steel in compression are presented in Figures 6–9 in the form of true stress-true strain diagrams
The isotropic hardening and strain rate hardening of the S355 structural steel under static and dynamic tension and compression loads are discussed in this paper

Summary

Introduction

The European Physical Journal Special Topics to compare the mechanical compressive and tensile properties of the S355 structural (mild) steel in a wide range of strain rates. A comparison between these parameters and those obtained from tensile tests in a wide range of strain rates are reported as well [5]. The commonly adopted geometry for dynamic testing with the split Hopkinson tensile bar (SHTB; 3 mm in diameter and 5 mm of gauge length) [5] was used for the tensile tests. In both cases the same geometry and dimensions were used for quasi-static and high strain rate tests

Objectives

Results

Conclusion