Abstract
Traditionally assessment of reliability of electrical components is done by classical reliability techniques using failure rates as the basic measure of reliability. In this paper a structural reliability approach is applied in order to include all relevant uncertainties and to give a more detailed description of the reliability. A physics of failure approach is applied. A SnAg solder component used in power electronics is used as an example. Crack propagation in the SnAg solder is modeled and a model to assess the accumulated plastic strain is proposed based on a physics of failure approach. Based on the proposed model it is described how to find the accumulated linear damage and reliability levels for a given temperature loading profile. Using structural reliability methods the reliability levels of the electrical components are assessed by introducing scale factors for stresses.
Original language | English |
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Journal | Reliability Engineering & System Safety |
Volume | 108 |
Issue number | December 2012 |
Pages (from-to) | 100–107 |
Number of pages | 8 |
ISSN | 0951-8320 |
DOIs | |
Publication status | Published - 2012 |
Keywords
- Wind Turbine Reliability
- IGBT Damage Model
- SnAg Solders Fatigue and Damage Model
- Physics of Failure Approach
- Thermal Aging
- Structural Reliability Application