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				| 1. | The stress intensity for a plate is given as K=σ√(πa) tan(πta); where a is crack length equal to 6 mm, t is the thickness of the plate equal to 1 cm, and σ is the nominal stress applied. Determine the maximum allowable stress if KIc=50 MPa m-1/2. | 
| A. | tan(πta); where a is crack length equal to 6 mm, t is the thickness of the plate equal to 1 cm, and σ is the nominal stress applied. Determine the maximum allowable stress if KIc=50 MPa m-1/2.a) 100 MPa | 
| B. | 145 MPa | 
| C. | 200 MPa | 
| D. | 500 MPa | 
| Answer» C. 200 MPa | |