CONSTITUTIVE EQUATION OF AISI 316 AT HIGH RATE OF STRAIN
Tensile tests have been performed on AISI 316 and other austenitic stainless steels auch as AISI 304, AISI 347, AISI 321. AISI 316 20 % C.W., at ambient temperature, 400 and 550 degrees C and strain rates up to 1000 sec-1, using a hydropneumatic machine and a modified Hopkinson bar. The results obtained for AISI 316 H and AISI 316 L were used to calibrate the constitutive equation proposed by Perzyna and in an attempt to calibrate a Bodner model. We have performed some experiments on AISI 316 H at strain rate varying between 10**-2 s --1 and 500 s --1 and although the material is strain rate sensitive, it has been shown that it is insensitive to strain rate history, within the scope of this investigation. Therefore in these test conditions the calibrated constitutive equations may be considered as a mechanical equation of state. In order to obtain directly on the specimen an improved full field measurement of strain in the first part of the stress strain diagram obtained in the actual tensile experiments, we have developed an optical system based on laser interferometry by which we produce a high sensitivity Moire. We have actually used such a system up to e = 10 s --1 and applications to Hopkinson's bar test are running.
Bibliographic Reference: 3RD INTERNATIONAL CONFERENCE ON MECHANICAL PROPERTIES OF MATERIALS AT HIGH RATES OF STRAIN, OXFORD (UK), APRIL 9-12, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31406 ORA
Availability: Can be ordered online
Record Number: 1989122082200 / Last updated on: 1987-01-01
Available languages: en