Objective The project deals with the solution of a fundamental scientific and engineering problem of the design and prediction of long-term deformation and fracture processes of structural materials and components under the complex stress state within a wide range of temperatures, loading and lifetimes. The problem is of prime importance to the further development of fundamentals of Solid Mechanics, Fracture Mechanics and Engineering Methods of the prediction of resource of modern and fossil energy installations. The solution of the problem is carried out by the construction of scalar and vectorial long-term fracture criteria, viscous, visco-brittle and brittle long-term fracture models and methods of the time to fracture calculation considering two-stage of fracture. The methodology of the solution is based on the analysis of the experimental data, formulation of corresponding hypotheses and development of theories and their experimental justification. Microscopic verification is given to the macroscopic established conditions of the advent of various modes of long-term creep fracture. A concept of equivalent long-term strength diagrams corresponding to seven main stress tensor invariants is used to construct long-term fracture criteria. Models of long-term fracture are derived from the joint consideration of constitutive equations of the isochronous creep theory and evolutionary equations giving the embrittlement kinetics. The effect of corrosive medium is given by the differential equation of diffusion. The generalization of one-dimensional fracture models for multiaxial loading is carried out by means of equivalent stresses. Method of the time to fracture calculation of structural components is based on the numerical solution of a boundary-value problem of the creep theory with the moving boundary reflecting the propagation of a fracture front or a creep crack. A list of critical components and reasons of their failure, which limit the resource of modern, and fossil energy installations as well as a bank of experimental data on creep and creep fracture of metal and composite materials and components has been created. A method of mixed scalar long-term fracture criteria considering the type of the stress state and signs of principal stresses is suggested. A software package to solve the creep boundary-value problem with moving boundary and to calculate components life-time is developed. Recommendations on the prediction of residual and service lifetimes of critical components of modern and fossil energy installations with the aim to increase their reliability, safety and economical efficiency are formulated. Programme(s) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Topic(s) OPEN - OPEN Call Call for proposal Data not available Funding Scheme Data not available Coordinator University of Siegen EU contribution No data Address Herrengarten 3 57068 Siegen Germany See on map Links Website Opens in new window Total cost No data Participants (4) Sort alphabetically Sort by EU Contribution Expand all Collapse all M. V. Lomonosow Moscow State University Russia EU contribution No data Address Michurinsky prospect 1 117234 Moscow See on map Total cost No data National Academy of Science of Ukraine S. P. Timoshenko Institute of Mechanics Ukraine EU contribution No data Address Nesterov str. 3 03057 Kyiv See on map Total cost No data Siberian Branch of Russian Academy of Science M. A. Lavrent'ev Institute of Hydrodynamics Russia EU contribution No data Address Academician Lavrent'ev prospect 15 630090 Novosibirsk See on map Total cost No data University of Portsmouth United Kingdom EU contribution No data Address Anglesea Road 01 P01 3DJ Portsmouth See on map Total cost No data
