No abstract

No abstract

No abstract

This paper describes computational analysis of the thermal ratcheting of solder-bonded layered plates subjected to cyclic thermal loading following solder-bonding. Finite element computations of Si/solder/Cu layered plates are performed by taking into account mechanical ratcheting of the copper as well as temperature-dependent creep of the solder. A sophisticated non-linear kinematic hardening model is used for appropriately representing mechanical ratcheting of the copper; a temperature-dependent power-law creep model is assumed for the solder. It is shown that the layered plates can exhibit either the cyclic recovery or the cyclic growth of deflection depending on the extent of plastic yielding in the copper layer, and that the cyclic recovery always occurs if the copper layer is elastic. It is also demonstrated that the cyclic recovery of deflection can be much greater than the static recovery of deflection at a constant temperature.

No abstract