Abstract
Three methods of evaluation of the plastic strain amplitude - a method considering constant modulus of elasticity, a method evaluating modulus of elasticity in each cycle during the loading, and a method using the half-width of the hysteresis loop - are compared in the high cycle fatigue region. Measured differences are discussed.

Key words
method considering constant modulus of elasticity, a method evaluating modulus of elasticity in each cycle during the loading, a method using the half-width of the hysteresis loop

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