The definition of J-integral of interfacial crack was introduced. The three-point bending tests were carried out to obtain the critical loading values when the interfacial crack initiation occurred between coatings and substrates. The finite element analysis (FEA) was adopted to analyze the stress distribution in the specimens and compute the J-integral of the interfacial crack between LX88A coating and Chinese Q345 steel. The results showed that the average value of critical J-integral is 0.70 N/m, which can be taken as the fracture parameter to evaluate the interfacial fracture behavior for the three-point bending specimens of LX88A coating/Q345 steel system.
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