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Energy-based solder fatigue model was used to correlate the inelastic strain energy with the package fatigue life.
It was confirmed in the thermal shock test that with the new design, package fatigue life improved by more than 70%.
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While the model had been previously proven successful for a number of material types and load spectra, in the present investigation the software demonstrated the ability to outperform the software package currently used for fatigue life prediction in the F-18 Hornet fighter aircraft during testing with component geometries, materials and load spectra all characteristic of the aircraft itself.
This self-sensitive piezoelectric cantilever can be used for fatigue test with packaged devices.
For the bend fatigue experiments, globtop BGA packages were mounted on HDI boards containing via-in-pad structures.
Typical 1st level reliability problems within Wafer Level Packages are cracking of repassivation materials, fatigue of bond over active pads, and cracks within the Under Bump Metalisation.
The aim was to develop a methodology for fast evaluation of the packages, with focus on wire bond fatigue, by combining finite element analysis (FEA) and mechanical fatigue testing.
This would enable it to fit with the timing of current survivorship care packages, highlighting strategies to deal with fatigue if it persists past initial recovery from treatment.
The order in which interviews were in the packaged set was randomised to prevent fatigue of the reviewers and learning effects in the interviews performed later in sequence.
A well-designed package structure can effectively restrain the solder joint fatigue failure induced by material coefficient of thermal expansion (CTE) mismatch.
The third step evaluated the utility of a multicomponent intervention package designed to address both the biological context (fatigue) and psychosocial context (task demands).
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