Finite Element Analysis of Behavior of Hard Film-Forging Tool Material Interface by Interface Damage Mechanics

摘要

Finite element analysis for mechanical behavior of hard film-forging tool material interface of forging tool under a closer condition to an actual forging situation than conventional scratch or indentation tests was performed by the interface damage mechanics. First, an examination model for indentation of spherical coated tool was proposed. Next, the non-linear spring model originally proposed by Ma & Kishimoto was used to describe the mechanical behavior of the interface. The evolution equation of the interface damage variable was introduced so that the deterioration of the interface could be expressed. The analyzed results show that the maximal interfacial normal displacement was observed at a position immediately before the lip of the indentation, whereas maximal interfacial tangential displacement was observed at a position immediately after the lip of the indentation. Then, two probable mechanisms of interfacial separation under the present analyzed condition were proposed from the calculated results.