Issue |
EPJ Web Conf.
Volume 250, 2021
DYMAT 2021 - 13th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
|
|
---|---|---|
Article Number | 05005 | |
Number of page(s) | 6 | |
Section | Metallic Materials | |
DOI | https://doi.org/10.1051/epjconf/202125005005 | |
Published online | 09 September 2021 |
https://doi.org/10.1051/epjconf/202125005005
Strain rate dependence of SM490B at room temperature and application to Cowper-Symonds constitutive models
1
Graduate School of Science and Engineering, National Defense Academy, Yokosuka, Japan.
2
National Defense Academy, Department of Mechanical Engineering, Yokosuka, Japan
3
Nippon Kaiji Kyokai, Research Institute, Chiyoda, Tokyo, Japan.
* Corresponding author: em59031@nda.ac.jp
Published online: 9 September 2021
Steel is widely used as a constituent material for various structures such as automobiles and ships. To perform high precision analysis including high strain rate behavior, an understanding for the strain rate dependence of material strength becomes very important. The purpose of this study is to evaluate the strain rate dependence of material strength with rolled steels for welded structure, JIS SM490B (ASTM E). We investigated the deformation characteristics at room temperature by performing compression tests at a wide range of strain rates and applied the obtained experimental results to the material constitutive model using an optimization method of Nelder-Mead method. The quasi-static tests were conducted using a universal testing machine at the strain rate of 10-3, 10-2 and 10-1 s-1. The impact test was conducted using a split Hopkinson pressure bar apparatus at the strain rate of approximately 103 s-1. As the results of the compression tests, it was confirmed that SM490B has a positive strain rate dependence of material strength. The Cowper-Symonds constitutive model showed good agreement with the experimental results up to the strain of 20%. However, the error became larger between experimental results and CS approximation as the strain increases to 20% or more.
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.