Thermal environmental stress can anticipate acute fatigue during exercise at a fixed intensity (%VO2max). Controversy exists about whether this anticipation is caused by the absolute internal temperature (Tint, degrees C), by the heat storage rate (HSR, cal/min) or by both mechanisms. The aim of the present study was to study acute fatigue (total exercise time, TET) during thermal stress by det...

Electronic power devices used for transportation applications (automotive and avionics) experience severe temperature variations, which promote their thermal fatigue and failure. For example, for power modules mounted on the engine of an aircraft, temperature variations range from –55°C (in the worst case of storage before takeoff) to +200°C (flight). Direct bonded copper (DBC) substrates are u...

Jet Propulsion Laboratory California Institute of Technology Pasadena, CA 91109 Differential expansion induced fatigue resulting from temperature cycling is a leading cause of solder joint failures in spacecraft. Achieving high reliability flight hardware requires that each element of the fatigue issue be addressed carefully. This includes defining the complete thermal-cycle environment to be e...

Fatigue damage of solder joints is a serious reliability concern in electronic packaging. In this study, a flip chip package was modeled to investigate the effects of underfill material properties and BT substrate thickness on solder joint reliability. The CTE was found to have the main effect and matching CTE between underfill and solder joint is the most important consideration in the selecti...

*Department of Mechanical Engineering, Anna University of Technology Tirunelveli, Tirunelveli627 007, Tamilnadu, India **Department of Production Engineering, National Institute of Technology, Tiruchirappalli-620 015, TamilNadu, India ABSTRACT Super heater tubes are subjected to alternate heating and cooling in power plants causes crack and eventually fail. This phenomenon is termed as ‘thermal...

This paper presents three power module cooling topologies that are being considered for use in electric traction drive vehicles such as a hybrid electric, plug-in hybrid electric, or electric vehicle. The impact on the fatigue life of solder joints for each cooling option is investigated along with the thermal performance. Considering solder joint reliability and thermal performance, topologies...

In 1985, EPRI embarked upon the development of an on-line fatigue monitoring system for nuclear power plant components. The resultant system, FatiguePro, has been successfully implemented and operated at approximately thirty operating nuclear units worldwide over the past twelve years. Significant efforts have been expended on the development of the FatiguePro software over the past twelve year...