The interfacial fracture energy G , which includes the effect of residual stress, was deduced for Ni films on titanium and stainless steel substrates based on the energy balance argument and the numerical method for the work expenditure G db of Moidu et al. The estimated interfacial fracture energies G are independent of the film thickness, the peel angle and the residual stress. The value of G for Ni films on a stainless steel substrate is about 5.47 ～ 6.08?N/m for various peel angles θ , while 5.33 ～ 6.72?N/m for Ni films on titanium substrate with various film thickness h . The effect of the residual stress on the peel strength P/b was also discussed.
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