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This paper presents a series of experiment results on the ageing effects of cyclic junction temperature variations ( $\Delta T_{j}$) of low amplitudes in power modules, to help the capturing of module reliability characteristics and the derivation of lifetime models in the future. Power cycling tests, for nonaged and aged modules, are designed to illustrate the failure mechanisms. Insulated gate bipolar...
This paper presents a method to obtain the effects of small ΔTj on the power modules so that we can enhance the reliability and lifetime model. Bonding wire fatigue and die-attach solder fatigue have been identified as one of the main root causes of power electronic module failures. Power cycling rig is designed to obtain the process of power module failure and account for the thermal fatigue life...
Impact drive mechanism (IDM) has been applied in many fields in recent years. As an important component, the piezoelectric element (multilayer actuator) influences the mechanism's performance to a large extent. After been used for a long time, fatigue of the element will occur undoubtedly, which may be disadvantageous to the motion characteristic of IDM. The relationship between the fatigue and the...
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