On the Role of the Process Zone in Hydrogen Assisted Cracking-I. Threshold Conditions

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Department of Mechanical Engineering-Engineering Mechanics


In preceding papers we defined the geometric and stress distribution characteristics of the process zone (PZ) for subcritical cracking. Here we apply these results to consider the problem of hydrogen assisted cracking under threshold conditions. In particular, the relation of threshold stress intensity factors (KTH) vs hydrogen pressure (P) for elastoplastic materials is theoretically established in accord with experiments. As a byproduct of the analysis, the mean hydrogen concentration within the PZ is calculated and we use this result in Part II of this work where kinetic conditions are discussed and stress intensity factors (K) vs velocity (V) profiles are obtained.

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© 1988

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Engineering Fracture Mechanics