PSI - Issue 40

Vladlen Nazarov et al. / Procedia Structural Integrity 40 (2022) 341–347 Vladlen Nazarov / Structural Integrity Procedia 00 (2022) 000 – 000

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5

Fig. 2. Dependences of porosity (13) and strains (5) on a relative arbitrary radius, where 1 and 2 are Cauchy strains for incompressible material, 3 is porosity, 4 and 5 are Cauchy strains for pores material. Thus, the process of evolution of porosity can have a noticeable quantitative effect on strains.

4. An example of practical application for describing the process of hydrogen corrosion at high temperature The obtained dependence of porosity on an arbitrary radius can be useful in describing the features of the fracture process (Fig. 3), where one main crack is formed in the absence of chemical interaction of gas inside the cavity with steel (a), and so during the chemical interaction of hydrogen with the steel forming a plurality of main cracks (b).

a

b

Fig. 3. Features of the origin of radial cracks in the cross section of the cylindrical tube under the influence of internal pressure under creep conditions at high temperature: under pressure without chemical interaction (a), under pressure of hydrogen and its chemical interaction with steel (b).