HIGH SPEED TENSILE TEST OF STEEL SHEETS FOR THE STRESS-STRAIN CURVE AT THE INTERMEDIATE STRAIN RATE

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This paper presents stress-strain curves of steel sheets for an auto-body obtained at intermediate strain rates with a servo-hydraulic type high speed tensile testing machine. The apparatus has the maximum stroke velocity of 7.8 m/sec to obtain the tensile material properties at a strain rate of up to 500/sec. A special jig fixture is specially designed for accurate acquisition of tensile loads with reduction of the load-ringing phenomenon induced by unstable stress wave propagation at high strain rates. Tensile testing of steel sheets for an auto-body was carried out to obtain stress-strain curves of mild steel and advanced high strength steels at strain rates ranged from 1/sec to 200/sec. The test results provide interesting information regarding the stress-strain curves at intermediate strain rates ranged from 1/sec to 200/sec and demonstrate that strain rate hardening is strongly coupled with strain hardening.
Publisher
KOREAN SOC AUTOMOTIVE ENGINEERS
Issue Date
2009-04
Language
English
Article Type
Article
Keywords

SPLIT HOPKINSON BAR; AUTO-BODY; ALUMINUM; BEHAVIOR; METALS

Citation

INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY, v.10, no.2, pp.195 - 204

ISSN
1229-9138
URI
http://hdl.handle.net/10203/19403
Appears in Collection
ME-Journal Papers(저널논문)
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