Determine (a) the J-integral (J) and (b) the dJ/da for a hypothetical steel plate containing a central crack of 114 mm long loaded at 276 MPa and e...

Determine (a) the J-integral (J) and (b) the dJ/da for a hypothetical steel plate containing a central crack of 114 mm long loaded at 276 MPa and exposed to room temperature air. What does TJ < TR mean? Assume plane strain conditions and that the stainless steel obeys the Ramberg-Osgood relation with curve fitting parameters such as 69.1' and .42.5n Explain the results based on the strain hardening effect. Data: ,850,206 MPaE  ,207 MPays  3.0 and .130 2kJ/mJ IC  Dimensions: ,2284 mmaw  wL 2
a) Calculate J-integral and dJ/da.
b) Explain what TJ < TR means and the results based on the strain hardening effect.