PAPERS & REPORTS

Introduce technical papers and reports of IIT (Instrumented Indentation Technology) and correlated fields.

 

Title

Characterization of mechanical properties by indentation tests and FE analysis – validation by application to a weld zone of DP590 steel

Author

Kyung-Hwan Chung a, Wonoh Lee b, Ji Hoon Kim c, Chongmin Kim d, Sung Ho Park a,

Dongil Kwone, Kwansoo Chung e,*

a Automotive Steel Applications Research Group, Technical Research Labs, POSCO, 699 Gumho-dong, Gwangyang, Jeonnam 545-090, Republic of Korea

b Composite Materials Research Group, Korea Institute of Materials Science, 531 Changwon-daero, Changwon, Kyungnam 641-010, Republic of Korea

c Department of Materials Science and Engineering, Ohio State University, 2041 College Road, Columbus, OH 43210, USA

d Materials and Process Lab., R&D Center & NAO Planning General Motors, Warren, MI 48090-9055, USA

e Department of Materials Science and Engineering, Intelligent Textile System Research Center, Seoul National University, 56-1, Shinlim-dong, Kwanak-ku,

Seoul 151-742, Republic of Korea

Press and Date of publication

Article history:

Received 22 June 2008

Received in revised form 22 August 2008

Available online 12 September 2008

Abstract

In this work, the mechanical properties of the metal active gas (MAG) weld zone and heat

affected zone (HAZ) were characterized utilizing the continuous indentation method

together with its finite element (FEM) analysis. To verify the measured properties, uni-axial

tension and three point bending tests were performed for DP590 welded specimens. For

numerical simulations, the isotropic hardening law was assumed along with the non-quadratic

anisotropic yield function, Yld2000-2d. As for the failure criterion of the base material

and weld zones particularly for the failure evaluation in the uni-axial tension test, Hill’s

bifurcation theory and the M–K theory were applied to calculate the forming limit diagrams

considering all measured properties including strain-rate sensitivity.

_ 2008 Elsevier Ltd. All rights reserved.

Keywords:

DP-steel

MAG weld zone

Strain-rate sensitivity

Formability

Continuous indentation method