Assessment of limit state and residual life of energy and transport equipment structural elements

Work number - M 15 FILED

Ternopil Ivan Puluj National Technical University

 Authors: Volodymyr Iasnii, Andriy Sorochak

 The aim of this work is to develop the methods of assessing residual strength and lifetime of energy and transport equipment structural elements considering operational factors influence oncrack resistance, corrosion cracking, degradation of structure and mechanical properties of materials.

Proposed approach is based on modelling the limiting state using failure assessment diagrams and crack propagation in structural elements based on stress field analysis and stress intensity factors calculation taking into account shape and size of defects, operational factors influence on the crack growth under cyclic and static loading.

This work is performed using linear and nonlinear mechanics, statistical methods, modern experimental mechanical and electron microscopy investigation methods. It’s focused on solving the important scientific and technical problems of power engineering and transport – unexpected failure prevention of important high-temperature structural elements of thermal power plants (TPPs) equipment and ensuring reliable operation of the railway axles.

Main regularities of operational factors influence on deformation and fracture micromechanisms, multiple cracking, mechanical properties degradation, crack growth resistance of transport and energy equipment materials under cyclic and static loading, corrosion cracking and their statistical scatter were revealed by authors. Using finite elements method stress-strain state in critical parts of structural elements was analysed taking into account form and size of defects.

Obtained results are using to assess the operational capability of TPPheaders (Burshtyn TPP, DTEK ZAHIDENERGO) and railway axles (“Ternopil Locomotive Shed”). Study results represent a significant contribution to solve the problem of ultimate strength and durability assessment of structural elements considering operational damage and can be applied into power engineering, metallurgy, railway transport and aviation.

Number of publications:Total number is 74, on the topic 42, including 30 articles (15 – in foreign journals). According to Scopus database total citations number of authors’ publications is 51, h-index (for a work) = 7; according to Google Scholar database total citations number is 86, h-index (for a work) = 9.