Abstract: Based on the low-cycle fatigue tests of carbon and alloy steels,the cyclic properties of hysteresis energy and its changing rules have been analysed.The mathematical formula of cyclic hysteresis energy of the materials with different cyclic properties have been presented. The total absorbed energy to failure is associated with the variation of cyclic hysteresis energy.

Key words: cyclic hysteresis loop, cyclic hysteresis energy, fatigue failure life, Masing material, Non-Masing material