小形エンジンのシリンダ材料中のき裂, 空孔および介在物の引張下応力拡大係数

抄録

Recently, there are a lot of thing to make the recyclable resource as a raw material in various fields. The reason for the earth resource is that there is a limit. The recyclable resource is used as for two-cycle engine for a small output. The cylinder is undertaken to the high temperature and the high pressure while the engine is working. As a result, the thermal deformation occurs in the cylinder. The bubble might come to be mixed when the crack occurs in the cylinder for the aged deterioration and while the engine is casting. The stress concentration is caused at the edge of this crack, and it becomes of one of the reason for destruction when the crack progresses. There is a method that evaluates from the viewpoint of the destructive power study to the stress intensity factor to see the stress change by the position of the crack and the bubble from thinning the thickness of the cylinder wall to lighten it. The deformation of the cylinder was measured and the behavior of the cylinder was simulated by the FEM method. This research is the evaluation of the stress change seen by the crack because of the deformation of the cylinder and the position of the bubble by the photoelasicity method and the caustics method.