The young s modulus of the steel is 600 MPa, and the plastic stress re – McqOptions

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1.	The young s modulus of the steel is 600 MPa, and the plastic stress required to extend the crack is 50*10-9, and the initial crack length is 2 microns. Find the fracture stress required to crack the material?
A.	15 MPa
B.	50 MPa
C.	15 GPa
D.	10 MPa
Answer» B. 50 MPa

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