| Objectives | Background | Approach |
Provide easy to use failure model to access the life of a BGA
under vibration loading.
Products are currently being fielded with BGA components where the designers have spent considerable effort to insure that the component attaches do not fail under thermal cycling, but with little to no analysis as to the life of the attach under vibration loading. Up to now this potential problem has not been an issue since the products have typically be subjected to relatively benign vibration environments. As designers confidence in BGAs increase, BGAs will be used in more and more products that will experience more sever vibration environments.
No easy to use failure models are available for designers to assess the durability of BGA components under vibration loading. CALCE has developed and demonstrated the durability assessment methodology using finite element modeling and incremental damage superposition techniques for vibration environments, but this technique is not easily implemented by the average design engineer. See for example C98-41, C99-31, C00-6. The knowledge gained in these projects will be used to help develop a failure models more easily implemented by designers. Finite element models of representative BAG structures will be used, in adition to vibration failure data to calibrate these simpler failure models. These calibration factors will be added to the failure model implementation with the appropriate documentation. As part of the documentation a detailed bibliography will be created on all published papers related to BGA vibration failures.