Compressibility and fugacity of gaseous hydrogen

The concept of fugacity is explained. Application of compressibility and fugacity data in hydrogen embrittlement calculations is discussed. Equations of state are reviewed. Compressibility factors and fugacity coefficients are calculated. A best estimate is proposed.

Hydrogen embrittlement of the circumferentially notched round specimen

Delayed failure test results for hydrogenated and cadmium plated specimens, tested by Johnson, Korlet and Troiano, have been analyzed on the basis of equations developed by the author. It is found that in a non-homogeneous stress field the hydrogen diffuses to and accumulates at the elastic-plastic interface. The local hydrogen concentration...