Chemical pipelines material fatigue

The paper presents several aspects of the technical state assessment problem of the chemical industry pipelines working under mechanical and thermal loading. The material fatigue process in the chosen object have been discussed. The following methodical problems have been presented: methods of mechanical behaviour investigation of materials in specific operating conditions, modelling the object from the point of view of solids mechanics using FEM, structure of materials changes under mechanical and thermal loading. Models of the pipeline have been worked out. Areas of the maximal effort have been determined in this pipeline. Characteristics of the stress cycles in pipeline elements have been assigned. The mechanical conditions of the material fatigue process have been described.