(SI Units) In a tensile test, the starting gage length = 100.0 mm and the cross-sectional area = 150 mm2. During testing, the following force and gage length data are collected: (1) 17,790 N at 100.2 mm, (2) 23,040 N at 103.5 mm, (3) 27,370 N at 110.5 mm, (4) 28,910 N at 122.0 mm, (5) 27,480 N at 130.0 mm, and (6) 20,460 N at 135.1 mm. The final data point (6) occurred immediately prior to failure. Yielding occurred at a load of 19,390 N (0.2% offset value), and the maximum load (4) was 28,960 N. (a) Plot the engineering stress strain curve. Determine (b) yield strength, (c) modulus of elasticity, (d) tensile strength, and (e) percent elongation.

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  b) Yield stress = load at yield point / area =19390/150=129.26MPa

  c)E= yiled stress/ strain=129.26/strain at yield

  using slope in elastic range

  slope=118.6-0/0.002-0=59300

  129.26-118.6/(strain at yield-0.002)=59300

  =0.002179

  therefore, E=59.32 GPa

  d) tensile strength= maximum load/ cross sectional area=28960/150=193.07MPa

  e) percentage elongation= change in length / original length *100=.351*100=35.1%