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The data below were taken on a test material to determine its fracture toughness. The specimens were 25 mm thick.
A. Make a plot of P versus u.
B. Using this plot with Gurney's method, determine the value of G for several combinations of points.
Crack length, a mm
Displacement, u mm
Load, PN
51
0.17
2370
76
0.31
1495
100
0.54
1170
125
0.81
980
155
1.15
825
180
1.52
750
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