積層複合材の界面あれ成長メカニズムの検討

概要

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Inhomogeneous deformation occurring at the interface of a laminated thin sheet is considered to be one of the mechanical behaviors causing interface fracture or determining its forming limit. The behavior of deformation such as interfacial roughening may also be related with the interfacial plastic instability. Experimental investigations on such deformation have been performed by using an aluminum foil laminated with a plastic film on each side and subjecting it to biaxial tension. This report puts an emphasis on the growth of interfacial roughening in comparison with the surface roughening in the aluminum foil alone subjected to the same tension. The relation between the growth of roughening and macroscopic fracture is also discussed. Two kinds of aluminum foils were supplied, one being pure aluminum with a certain grain size and the other aluminum alloy. The interfacial roughening was observed in-situ through an optical microscope and was measured at several strain levels from the cross sections of the laminate samples which were molded by resin. It was found that the interfacial roughening did not grow monotonically due to the hardening properties and the rigidity (thickness) of the skin material. It is also regarded as one of the characteristic features of fracture that the necking occurs in the aluminum foil after the delamination at the interface propagates up to a certain region.
社団法人日本材料学会の論文
1992-07-15