Journal Published Online: 21 August 2019
Volume 8, Issue 1

A Comparative Study of Forming and Crash Behavior of High Strength Steels

CODEN: MPCACD

Abstract

Advanced high strength (AHS) steel sheets of various grades have been increasingly used in the automotive industries because of their advantageous mechanical properties. High strength and great energy absorption are desired for a structural component design. On the other hand, large formability and strain hardening are necessary for achieving an effective forming process. To apply eligible steel grades, precise understanding of their forming and crash characteristics is needed. In this work, AHS steels with varying strengths, namely grades 780, 980, and 1180, were investigated. First, tensile tests were performed, and mechanical properties, including r-values, of the examined steels were obtained for different loading directions. The forming limit curves (FLCs) and respective forming limit stress curves (FLSCs) were determined by means of a Nakajima forming test and finite element simulation. The cyclic tension-compression tests were conducted to characterize the elastic recovery and Bauschinger effect of steels. Afterward, forming processes of an automotive part were performed, and the forming and springback behaviors of steels were evaluated by using simulations coupled with Hill’48 and Yoshida-Uemori models, determined material parameters, FLCs, and FLSCs. In addition, crashworthiness of steels was numerically studied by means of a crash rectangle profile and simplified side impact pole test. The mechanical, forming, and crash performances of all the investigated AHS steels were evaluated and discussed so that the results can be applied for part design and manufacturing.

Author Information

Kingklang, S.
Advanced Metallurgy and Forming Process (AMeF) Laboratory, Department of Mechanical Engineering, King Mongkut’s University of Technology Thonburi, Bang Mod, Thung Khru, Bangkok, Thailand
Julsri, W.
Advanced Metallurgy and Forming Process (AMeF) Laboratory, Department of Mechanical Engineering, King Mongkut’s University of Technology Thonburi, Bang Mod, Thung Khru, Bangkok, Thailand
Chiyatan, T.
Advanced Metallurgy and Forming Process (AMeF) Laboratory, Department of Mechanical Engineering, King Mongkut’s University of Technology Thonburi, Bang Mod, Thung Khru, Bangkok, Thailand
Uthaisangsuk, V.
Advanced Metallurgy and Forming Process (AMeF) Laboratory, Department of Mechanical Engineering, King Mongkut’s University of Technology Thonburi, Bang Mod, Thung Khru, Bangkok, Thailand
Pages: 25
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: MPC20190089
ISSN: 2379-1365
DOI: 10.1520/MPC20190089