ジンクリッチペイントを施した高力ボルト摩擦接合部に関する研究

抄録

The results of slip tests and relaxation tests on high strength bolted joints treated with zinc-rich paint are described herein. The main purpose of these tests would be to estimate the influences of thickness of zinc-rich paint on slip coefficients and to estimate the reduction of bolt tension. The thickness of zinc-rich paint and the surface conditions of specimen plate are mainly considered as tests factors. Ultimately, 38 types of specimens are prepared for slip tests and 9 types specimens are prepared for relaxation tests. And the additional tests with improved zinc-rich paint are described lastly. The main conclusions are as follows, (l)the thicker the coating of zinc-rich paint,the slip coefficients have a tendency to be higher. (2)For keeping the higher slip coefficients than 0.45, the minimal coating thickness must be kept on slip surfaces and this minimal thickness are estimated to be 20 fi in these tests. (3)After six month from initial clamping,the reduction of bolt tension with baking finished bolts is higher than that with ordinary high strength bolts. (4)The improved zinc-rich paint has an effect on increasing the slip coefficients. (5)There is no difference of the reduction of bolt tension between the ordinary zinc-rich paint and improved zinc-rich paint. The reduction of bolt tension mainly depends on the thickness of zinc-rich paint.