An aluminum alloy specimen brought to tensile test had ½ inch2 cross sectional area. It was tested to fracture and using a 2 inch gauge its extensions were obtained at different load levels during the test. The data obtained are as shown below:
|
Load, lb
|
l, inch
|
Load, lb
|
l, inch
|
Load, lb
|
l, inch
|
|
1000
|
2.0004
|
10,000
|
2.0040
|
25,000
|
2.80
|
|
2000
|
2.0008
|
15,000
|
2.0062
|
20,000
|
3.32
|
|
5000
|
2.0020
|
20,000
|
2.022
|
15,000
|
3.46 fracture
|
(a) Draw the engineering stress-strain diagram for the metal
(b) Find the elasticity modulus, 0.2% offset yield strength, tensile strength and % elongation to failure through proper procedure.
(c) What would be the approximate BHN or HB of the material?