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
|