J. Phys. IV France
Volume 110, September 2003
Page(s) 385 - 390

J. Phys. IV France
110 (2003) 385
DOI: 10.1051/jp4:20020724

New testing techniques to obtain tensile stress-strain curves for a wide range of strain rates

S. Tanimura1, K. Mimura1 and T. Umeda2

1  Department of Mechanical Systems Engineering, Aichi University of Technology, Gamagori-City, Aichi 443-0047, Japan
2  Division of Mechanical Systems Engineering, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan

A new method of applying a dynamic load directly to a tensile specimen was developed. By combining the new method with the testing method based on a sensing block [1-5], we improved the testing method to obtain the entire tensile stress-strain curves for a wide range of strain rates on the order of  $10^{-3}\sim 10^{-3}$ s -1, with remarkable accuracy, especially for the high strain rates range. Based on numerical simulations and experiments, the accuracy of the measurement of the non-coaxial Hopkinson bar method [6,7] was discussed. By performing a series of numerical simulations, the relation between the gauge length of a specimen and the testing strain rate, necessary for obtaining an accurate dynamic stress-strain curves corresponding to a testing error of approxmatety 2% or 4%, was also obtained for a wide range of strain ratesfrom 10 -1 to 10 4 s -1.

© EDP Sciences 2003