期刊
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
卷 10, 期 2, 页码 195-204出版社
KOREAN SOC AUTOMOTIVE ENGINEERS
DOI: 10.1007/s12239-009-0023-3
关键词
High speed tensile testing machine; Strain rate hardening; Load ringing phenomenon; Auto-body steel sheets
资金
- National Research Foundation of Korea [과C6A1808] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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