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  4. Calculated Model for Determining the Subcritical Growth period of CorrosionMechanical Crack in Plate under Long-Term Static and Time Concentrated Quasi-Dynamic Loadings

Calculated Model for Determining the Subcritical Growth period of CorrosionMechanical Crack in Plate under Long-Term Static and Time Concentrated Quasi-Dynamic Loadings

Ivan Shtoyko ivan.shtoyko [at] gmail.com
  1. Karpenko Physico-Mechanical Institute of the NAS of Ukraine, Ukraine, Lviv, 5, Naukova str.
Abstract 

The calculation model for determining of residual durability of plate with straight corrosion-mechanical crack under long-term static tension and multiple time concentrated quasi-dynamic load is proposed. The model based on the energy approach for a study of delayed crack growth, models of pulsed load applying and the main mechanisms of corrosion-mechanical crack propagation. Based on this model, the dependence of residual life of the plate of X60 pipeline steel on a number of time concentrated quasi-dynamic loadings is investigated. 

Keywords 
pipeline steel
crack
model
energy approach
residual life
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