Hydrogen embrittlement characterization by disk pressure tests: test analysis and application to high chromium martensitic steels

Article Abstract:

The characterization of hydrogen effects on mechanical properties of chromium martensitic steels are based on experimental and numerical activity. Membrane components, and equi-biaxial and uniform plane stress conditions are found to dominate the stress distribution in DPT specimens. Hydrostatic stress and strain components are nearly constant within the gauge section. Electrochemical measurements show higher threshold concentrations than those by DPT. The Disk Pressure Test technique is used to conduct the experiments.

Usage, Observations, Metals, Metals (Materials), Electrochemical analysis, Chrome steel

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Strain concentration calculation of fatigue

Article Abstract:

A new method has been developed for calculating the plastic strain concentration of fatigue. The method uses several relaxation schemes in conjunction to characterize the behavior of the plastic zone under different loading conditions. The fatigue strain concentration curve is then obtained using this parameter. Results obtained by means of the proposed method were found to be in good agreement with existing experimental data.

Measurement, Strains and stresses, Stresses (Materials)

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Life prediction of notched components

Article Abstract:

Monoaxial fatigue tests in smooth and keyhole specimens constructed from low alloy pressure vessel steel show that stress concentration factor affects the number of cycles of failure. Total strain energy per cycle is a suitable parameter for determining the life of notched components. The test-derived values correlate well with the results from the elastoplastic FEM analysis.

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