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An aluminum alloy bar with a rectangular cross section that has a width of 125 mm thickness of 625 mm and a gage length of 50 mm was tested in tension to fracture according to ASTM E8 method The

An aluminum alloy bar with a rectangular cross section that has a width of 125 mm thickness of 625 mm and a gage length of 50 mm was tested in tension to fracture according to ASTM E8 method The

An aluminum alloy bar with a rectangular cross section that has a width of 12.5 mm, thickness of 6.25 mm, and a gage length of 50 mm was tested in tension to fracture according to ASTM E-8 method. The load and deformation data were as shown in Table P4.5.

Load (kN)

?L (mm)

Load (kN)

?L (mm)

 

0

0

33.5

1.486

 

3.3

0.025

35.3

2.189

 

14.0

0.115

37.8

3.390

 

25.0

0.220

39.8

4.829

 

29.0

0.406

40.8

5.961

 

30.6

0.705

41.6

7.386

 

31.7

0.981

41.2

8.047

 

32.7

1.245

 

 

Using a spreadsheet program, obtain the following:

a. A plot of the stress–strain relationship. Label the axes and show units.

b. A plot of the linear portion of the stress–strain relationship.

Determine the modulus of elasticity using the best fit approach.

c. Proportional limit.

d. Yield stress at an offset strain of 0.002 in/in.

e. Tangent modulus at a stress of 450 MPa.

f. Secant modulus at a stress of 450 MPa.

 
mahesh 01-Jul-2020

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