ポリカーボネート板の穴あけ加工による残留応力

概要

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The residual caused by drilling in photoelastic plastics was investigated by using the photoelastic measurement. The distribution of residual stresses around the drilled hole on a circular plate is apparently axisymmetric when the hole is small as compared with the size of the plate. We can obtain the distribution of residual stresses on the circular plate with a small hole drilled at the center, by measuring the isochromatics which arises from the superposition of compression being applied along a diameter of the circular plate and the initial stresses. The specimens were circular discs, 7 mm in thickness and 29 mm in diameter, which were prepared by slicing the rods of polycarbonate. The discs were drilled at the center with straight shank twist drills under several different drilling conditions. The isoclinics of the discs drilled at the center were examined under a no loading state, so as to ascertain that the distribution of residual stresses was approximately axisymmetric. Higher residual stresses were caused by smaller diameter of drill and faster rotational drill speed. The maximum value of residual stresses was about one-tenth of the yield stress of the material. The residual stress were relieved by annealing the discs at 130℃ for five hours.
社団法人日本材料学会の論文
1974-08-15