Micro-electronic components encapsulated with the high-polymer matrix composites are
easy to be affected with damp. In the process of welding, the temperature and moisture often cause
delamination and fracture in electronic components. For moisture and heat-sensitive high polymer
materials, when considering the problem of elastic breakdown induced by moisture and heat, the
strain energy release rate at the crack tip can be expressed as an integral form. With FEM and by
using the expression of energy release rate, the curves for the relationship of energy release rate
versus the ratios of crack length to the thickness of the package are obtained at different welding
temperature. The fracture of the electronic components is predicted through Comparing the
experimental data of strain energy release rate.