抄録
Test pieces of various kinds of steels and brass were first subjected to the ordinary repeated impact test at various numbers of repetition without rupture, and then broken by Charpy machine, and the energy required for the break-down and the angle of bend were measured. The relation between the breaking energy and the angle of bend was always a straight line passing through the origin. By the newly proposed theory which the author suggested basing on the present results, a newly defined true breaking strength n bending rupture could be obtned. Also, in tension rupture, a newly defined true breaking strength could equally be obtained by a newly suggested theory based on the straight line relation between breaking energy and breaking elongation.
