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An investigation has been carried out into the effects of a yield point on the cyclic loading properties of a range of strip-mill sheet steels. These include high-strength low-alloy steels, dual-phase steels, carbon-manganese steels, a mild steel in different conditions of heat treatment and a rephosphorised steel. The steels were strengthened by yield point effects, from precipitation combined with grain refinement, from the presence of second phase martensite or bainite, from dislocation substructures generated during low temperature transformation of austenite and from interstitial and substitutional solid solution strengthening. Several types of cyclic tests were carried out, in the main using smooth unnotched specimens. Some of these tests were carried out at constant strain amplitude and included monotonic tensile testing of the specimen after a predetermined number of cycles. Other tests were carried out using random strain amplitudes, involving subjecting a specimen to successive blocks of cycles, each of which contained 1,024 cycles, until fracture occurred. The pattern of random strains used was based on published data recorded for a vibrating vehicle component. Some constant strain amplitude tests were carried out using notched specimens.

Additional information

Authors: HUDD R C, British Steel plc, London (GB);JONES A, British Steel plc, London (GB)
Bibliographic Reference: EUR 13175 EN (1991) 184 pp., FS, ECU 16.25
Availability: (2)
ISBN: ISBN 92-826-0514-0
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