Ph.D. Proposal Presentation by Reinhard Powell
Monday, November 22, 2004

(Dr. Charles Ume, Chair)

"Development of FE Prediction Tools and Convective Solder Reflow-Projection Moiré Warpage Measurment System"


Over the past 50 years, electronics manufacturing industry has undergone revolutionary changes, which have provided consumers with a plethora of electronic products. The increase in functionality of electronic products and decrease in cost due to continuous miniaturization and lower manufacturing costs have evolved over time. As electronics manufacturing technology becomes more advanced, reliability of electronic products and devices have become more of a concern. Thermomechanical reliability in electronics is studied in this research. Thermomechanical failures are failures due to temperature loading conditions electronic products and devices experience during manufacturing and service. The thermomechanical issue studied in this research is the effect of convective solder reflow on the warpage of packaged electronic devices, bare boards and chip packages.

A convective reflow-projection moiré warpage measurement system is designed and implemented in this research. The system will be the first available system capable of measuring warpage of printed wiring boards (PWBs) with and without electronic components during simulated convective reflow process. A finite element prediction tool is also developed to predict the warpage of PWBs populated with plastic ball grid array (PBGA) packages. The developed warpage measurement system as well as the developed finite element model will be used to study various PWB assembly (PWBA) configurations and compare PWBA warpage due to simulated infrared and convective reflow processes.