Page 414 - Mechanical Behavior of Materials

Problems and Questions 415

Table P8.52

Test Crack Length Gross Stress at Fracture
No. a c ,mm S g ,MPa
1 3.00 453
2 5.35 405
3 10.70 342
4 18.43 276
5 34.60 202
6 62.19 142
Source: Data in [Orange 67].

√
(a) Plot these data, the line for σ o = 518 MPa, and the curve for K c = S πa =
√
66 MPa m, just as they appear in Fig. 8.5.
√
(b) Also plot a revised curve for K c = 66 MPa m, where the plastic zone adjustment is
used.
(c) Comment on the success of curve (b) in predicting the behavior.