Joint failed by tearing apart upper plate similar to A A., fractures first appearing at end of upper opposite the outside rivets. The under plate has a slight fracture at end of lap opposite the second rivet. Maximum loads on joint. Tensile strain on gross section of upper plate No. 37.-1" IRON PLATE. JOINT C. Failed by shearing three inside rivets and tearing out plate at the end rivets of the upper plate. H. Ex. 1 -2 Square inches. 2.58 2.44 1.69 .89 1.87 Rivets that were sheared were also fractured under the head. 25,270 38,580 73, 260 Tensile strain on gross section of upper plate... No. 38.-" IRON PLATE. JOINT C 34,870 Fractured in the same manner as C., by shearing the three inside rivets and tearing out the plate at the end rivets. This method of failure would indicate the ability of the plate to shear all the rivets in case the metal at the sides of the specimen was supported and prevented from spreading. Holes elongated from ".06 to ".08. Maximum loads on joint. Tensile strain on gross section of upper plate... No. 39.-" IRON PLATE. JOINT D. g" iron rivets, "Burden's best." Punched holes: Punch, ".695 diameter; die, ".752 diameter. 9.75 X.275 Square inches. .12.66 1.48 .1.18 2.31 Joint failed by fracturing the upper plate across five sections and the under plate across two sections of the plate between rivet holes. g" iron rivets, "Burden's best." Punched holes: Punch, ".695 diameter; die, ".752 diameter. Joint failed by fracturing the lower plate square across through line of rivet holes. Fractures started slightly at end of plate opposite two rivets. Square inches. 2.65 1.48 1.18 2.31 |