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A comparison of the Portevin-Le Chatelier effect in constant-strain-rate and constant-stress-rate tests

1991; Elsevier BV; Volume: 137; Linguagem: Inglês

10.1016/0921-5093(91)90330-p

1873-4936

Monika Fellner, M. Hamerský, Erwin Pink,

Fatigue and fracture mechanics

Tensile tests were performed on aluminium alloys prone to exhibit a Portevin-Le Chatelier effect, in order to compare the consequences of applying constant strain rates and constant stress rates. For all testing conditions known to produce different types of serration in constant-strain-rate tests, only one type, i.e. a step-like stress-strain curve, can be obtained in constant-stress-rate tests. Such a step is analogous to the appearance of an A-type serration in constant-strain-rate tests.