Question

The following readings were recorded during a tensile test of a mild steel specimen 24mm, wide by 10 mm thick and with gauge length of 200 mm.

Force (KN)= 16 32 48 64 68 72 76 79
Elongation =0.066 0.133 0.198 0.264 0.281 0.304 0.355 1.125

Force (KN) =76.8 83.7 103.8 111 112.8 108 96
Elongation = 3.75 6.66 15.00 25.00 36.5 45.0 50.0

The test piece fractured at a 50 mm elongation. Plot a load-extension diagram using the following scales : 10 Divisions on the x-axis = 5mm extension; 10 Divisions on the y-axis.

On the same graph paper using the scale 10 Divisions on x-axis = 0.5 mm extension, and 10 Divisions on the y-axis = 10 know, replot the elastic portion of the graph.
Using the graph, determine the following :
1.Modulus strength
2.Yield strength
3 ultimate tensile strength
4.percentage elongation

Answer 1

ORIGINAL AREA, A= 24*10 = 240MM²
ORIGINAL LENGTH, L˳= 200 MM
FORCE(kN)	ELONGATION(mm)
0	0
16	0.066
32	0.133
48	0.198
64	0.264
68	0.281
72	0.304
76	0.355
79	1.125
76.8	3.75
83.7	6.66
103.8	15
111	25
112.8	36.5
108	45
96	50