抄録
In the study of this shearing test, Amsler testing machine, three kinds of round shearing tools of 10mm, 25mm and 50mm in diameter respectively and autographic recorder are employed.The autographic recording system consists of dial gauge with thin disc having fifty slits, photocell, photo-electric-current amplifier with relay, electromagnet with ratchet attached to Amsler recording drum. By these apparatus, approximate shearing curves of round blank are recorded on the drum. The test pieces are of mild steel sheet of 0.96mm in thickness.
The results are as follows.
1) Nominal shearing stress decreases gradually in proportion to the increase of the tool clearance.
2) Nominal shearing stress is 7580% of ultimate tensile strength.
3) The Minimum values of the specific work required in each tool being about 12kg-mm/mm2, appear between 8 and 16% tool clearance,
4) And others.
