Hiron rivets, "Burden's best." Punched holes: Punch, ".753 diameter; die, ".774 diameter. Started fractures about rivet holes inside of center line of holes. Average elongation of holes, ".04. Square inches. 3.76 2.32 1.44 2.27 Hiron rivets, "Burden's best." Punched holes: Punch, ".753 diameter; die, ".774 diameter. Fractures dull fibrous. Fractures started about the rivet holes in the upper plate. Maximum loads on joint. Pounds per sq. inch. 22, 280 36, 130 58,150 35,520 Square inches. 3.81 2.35 1.46 2.39 37,460 60, 340 38, 280 |