四点弯曲法与声发射相结合，用于测定化学镀Ｎｉ－Ｐ镀层与基体的结合强度．实验结果与复合板模型的计算相一致．所测得的声发射曲线与镀层失效的外貌有关，凸起形（即鼓包）镀层失效对应于附着失效，横向裂纹失效对应于镀层的内聚失效．

A method which is a combination of the Four Point Bend in mechanics with Acoustic Emission was used to measure the adhensive strength of electroless NiP deposits to substrates.Experimental results obtained by this method was in accordance with calculation by the model of complex plate. It was found that the pattens of the Acoustic Emission curves were related to the appearance of NiP deposit failure: the convex deposit failure was in correspondance with adhensive failure of a deposit to a substerte and the borizontal crackles with cohensive failure of a deposit.