with 0.2 offset yield stress = 450 MPa and ultimate tensile stress = 550 MPa, E = 207 Gpa, v= 0.3.  Estimate the provisional value JQ as according to ASTM standard E1820 or equivalent.  Check whet

with 0.2 offset yield stress = 450 MPa and ultimate tensile stress = 550 MPa, E = 207 Gpa, v= 0.3. 

 Estimate the provisional value JQ as according to ASTM standard E1820 or equivalent.

  Check whether JQ = J1c  

 Determine the thickness for valid K1c test

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