MATERIALS / METHODS: Procedure: the tensometers operating mechanism was examined, particularly the handle and its gearing to the loading screw, and the rotating drum and the force indicating device a brass specimen ( 70/30 hard drawn / annealed ) was selected and its main dimensions measured using a vernier callipers, then recorded to 0.1 mm the 0 10 kN load beam and corresponding indicator scale ( highest available ) were – installed the mercury column was adjusted for zero, and no play in the specimen jaws / grips at each two revolutions of the hand crank, the corresponding force in kN was punch manually until final rupture of specimen occurred on the graph paper that was inserted prior to commencement the broken ends of the specimen were fitted back together and the corresponding dimensions to mentioned above were measured using the same vernier callipers the following data were observed from the graph plotted ; limit of proportionality load maximum load breaking load the following properties were calculated ; limit of proportionality stress ( eng. ) ultimate tensile stress ( eng. ) braking stress ( true ) percentage change in elongation percentage reduction in area strain at limit of proportionality modulus of elastically LAB RESULTS: Before Test
MATERIALS / METHODS: Procedure: the tensometers operating mechanism was examined, particularly the handle and its gearing to the loading screw, and the rotating drum and the force indicating device a brass specimen ( 70/30 hard drawn / annealed ) was selected and its main dimensions measured using a vernier callipers, then recorded to 0.1 mm the 0 – 10 kN load beam and corresponding indicator scale ( highest available ) were installed the mercury column was adjusted for zero, and no play in the specimen jaws / grips at each two revolutions of the hand crank, the corresponding force in kN was punch manually until final rupture of specimen occurred on the graph paper that was inserted prior to commencement the broken ends of the specimen were fitted back together and the corresponding dimensions to mentioned above were measured using the same vernier callipers the following data were observed from the graph plotted ; limit of proportionality load maximum load breaking load the following properties were calculated ; limit of proportionality stress ( eng. ) ultimate tensile stress ( eng. ) braking stress ( true ) percentage change in elongation percentage reduction in area strain at limit of proportionality modulus of elastically LAB RESULTS: Before Test