The result showed that the low-cycle fatigue cycle characteristic of the material is cyclic softening under the experimental condition and the softening velocity increases with the increasing of strain amplitude.

Analysis of cycle characteristics of 9Ni steel showed that,for all three kinds of heat treatment,there was no obvious cyclic softening phenomenon or cyclic hardening phenomenon at low strain amplitude;however, the fatigue cyclic characteristics of 9Ni steel were all cyclic softening at high strain amplitude,and in which it was most serious for QT1.

The plastic deformation of the main parts of the automotive chain and the cyclic characteristics of its wear surface were investigated.

This paper,taking a continuous heat recovery adsorption air-conditioning system/heat pump as study object,through dynamic analysis on system cycle characteristics,lists a series of dynamic equations about system main components such as adsorber,heat source,condenser,evaporator and so on.