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Exercise 2.9

12 October, 2015 - 15:00

Given below is Load-Gage Length data for a type 304 stainless steel that underwent a tensile test. Original specimen diameter is 12.7 mm. 1

Load [kN]

Gage Length [mm]

0.000

50.8000

4.890

50.8102

9.779

50.8203

14.670

50.8305

19.560

50.8406

24.450

50.8508

27.620

50.8610

29.390

50.8711

32.680

50.9016

33.950

50.9270

34.580

50.9524

35.220

50.9778

35.720

51.0032

40.540

51.816

48.390

53.340

59.030

55.880

65.870

58.420

69.420

60.960

69.670 (maximum)

61.468

68.150

63.500

60.810 (fracture)

66.040 (after fracture)

The engineering stress is defined as \sigma =\frac{P}{A} ,where P is the load [N] on the sample with an original cross-sectional area A [m^2] and the engineering strain is defined as \varepsilon =\frac{\Delta 1}{\iota }, where \Delta 1 is the change in length and \iota is the initial length.

Compute the stress and strain values for each of the measurements obtained in the tensile test. Data available for download. 2