Abstract
In eight different materials, constant plastic strain amplitude tests and constant stress amplitude tests in the high cycle region ( N > 10 5 cycles) were performed. By simultaneous recording of the plastic strain amplitude and the stress amplitude the hardening or softening behaviour of the materials was followed. The response of the materials is similar during both types of test, and cyclic stress - strain curves found using both procedures are in good agreement. In stress cycling of materials exhibiting a yield point the inhomogeneity of the plastic strain amplitude may occur and a real stress - strain curve cannot be found from constant stress amplitude cycling.
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