研究論文
実機ディーゼル機関シリンダヘッドに生じた残留応力に関する実験的検討
2002 年 74 巻 3 号 p. 182-187
詳細
2002 年 74 巻 3 号 p. 182-187
Residual stress on the fire surface of gray cast iron cylinder heads was examined. The measurements were carried out on two types of cylinder head using the cutting methodology. One was the non-operated head and the other was the 500hr operated head.
The residual stress on the surface of the non-operated head was found to be compression stress in the principal stress analysis. On the contrary, tensile residual stress occurred in the operated head. This was considered to be the effect of compression plastic deformation due to the high compression thermal stress resulting from repeated thermal load during engine operation. The residual stress distributions in the thickness direction of the fire surface were also investigated. The residual stress distribution in the operated head was relaxed as compared with non-operated head. Inserting the valve seat generated static tensile stress on the fire surface. This stress was a considerably large value.
