圧子押込試験による樹脂／金属異材接合体の界面強度評価

抄録

In order to evaluate interfacial strength of a small size dissimilar materials direct joint between resin and metallic materials, application of indentation test by using a wedge shape indenter was investigated. Groove was machined at the interface of a joint and a wedge shape indenter was inserted into the groove to avoid that an indenter preferentially penetrates into soft material of resin. An adhesive joint between PET and A5052 was prepared for pre-test. Delamination at the interface occurred by the indentation test proposed in the present study. Interfacial strength evaluated by the present method showed good agreement with interfacial strength obtained by bending test. It is concluded that the indentation method proposed can evaluate the interfacial strength in dissimilar materials joint between resin and metallic materials. A dissimilar material joint between Ni alloy and PPS was then tested as a model joint of an actual small component. According to the result of the indentation test, delamination successfully occurred at the interface with the present testing method. However, the interfacial crack was propagated continuously during the indentation test. Therefore, in case of the model joint of actual component, indentation method proposed can evaluate the interfacial strength qualitatively by critical load for the delamination.