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Stress-Strain Curves of High Strength Steel Sheets at Strain Rates From 10-3 To 103/S Obtained With Various Types of Tensile Testing Machines
Technical Paper
2005-01-0494
ISSN: 0148-7191, e-ISSN: 2688-3627
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Language:
English
Abstract
In order to evaluate the crashworthiness of impact energy absorbing parts for automobiles, it is very important to obtain accurate stress-strain (s-s) relationships for steel sheets under various strain rates. However, at high strain rates over 10/s, stress wave interference in the load cell obstructs precise measurement of the s-s relationship with conventional tensile testing equipment. Various new tensile testing machines have been developed to obtain accurate s-s relationships at high strain rates. Six of these machines (coaxial Split Hopkinson Pressure Bar method, Non-coaxial Split Hopkinson Pressure Bar method, One Bar method, Sensing Block Testing System, and two types using the Hydraulic Servo method) were used to obtain s-s relationships for high strength steel sheets. In this paper, the s-s relationships are compared and the characteristic of the curves was discussed. In the strain region over 5%, the same stress-strain relationships were obtained with all types of test equipment. However, in the small strain region below 5%, the relationship obtained at strain rates around 103/s depended on the equipments. Moreover, validation of dynamic s-s curves in crashworthiness evaluation of auto body parts was confirmed.
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Authors
- Shusaku Takagi - JFE Steel Corporation, Steel Research Laboratory
- Yuichi Tokita - JFE Steel Corporation, Steel Research Laboratory
- Kentaro Sato - JFE Steel Corporation, Steel Research Laboratory
- Tetsuo Shimizu - JFE Steel Corporation, Steel Research Laboratory
- Koichi Hashiguchi - JFE Techno-research
- Kinya Ogawa - KYOTO University
- Koji Mimura - Osaka Prefecture University
- Shinji Tanimura - Aichi University of Technology
Citation
Takagi, S., Tokita, Y., Sato, K., Shimizu, T. et al., "Stress-Strain Curves of High Strength Steel Sheets at Strain Rates From 10-3 To 103/S Obtained With Various Types of Tensile Testing Machines," SAE Technical Paper 2005-01-0494, 2005, https://doi.org/10.4271/2005-01-0494.Also In
Innovations in Modeling and Testing of Steel Structures for Automotive Applications, and Front and Rear Bumper Systems
Number: SP-1954; Published: 2005-04-11
Number: SP-1954; Published: 2005-04-11
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