振子型衝撃試験機の軸受摩擦と風抵抗とについて

抄録

To obtain accurate impact values within the limitations of impact testing machine of moving pendulum (Charpy, Izod, Izod-Charpy etc.), we must consider about a correction for the energy absorbed by friction in the machine bearing, for the loss due to air drag and frictional pointer. (1) Author has made clear up the theory about the energy absorbed by friction in the bearing and loss due to air drag quantatively. (2) In order to promote accuracy of the impact testing machine we prefer reducing air drag to friction of the bearing ; Coefficient of air drag against the moving pendulum C_x is 0.98∼0.66 for Charpy and 1.43∼0.93 for Izod testing machines general in use. (3) Computed value of decrement of angle γ₀ due to friction in the bearing, frictional pointer and air drag. we can utilize to correct impact value at any angle of fall. (4) We can get frictional coefficient of the bearing by simple calculation in error of 1%.