Deformation and destruction of materials and structures in the diffusion

The article contains overview of publications on the influence of mediums (mostly - hydrogen) on deformation and fracture processes. Some unresolved problems are pointed out. A new solution of coupled problem of diffusion and stress-strain state calculation is given using as example hydrogen equipment. It is shown that stresses caused by diffusion dilation, which was not taking into account previously, may be the main cause of low-cycle fracture. Understanding of role and mechanisms of the phenomena allow to influence the lifetime and safety of structures effectively. Results of pilot tests of zirconium and titanium alloys in gaseous environments are also discussed along with the testing equipment created in South-Ural State Univrsity for that purpises.