NUMERICALLY MODELLING THE DEFORMATION AND FAILURE PROCESSES OF STRUCTURES UNDER QUASISTATIC TERMAL-STRESS AND THERMAL-RADIATION LOADING FOR ASSESSING THEIR STRENGTH AND RESIDUAL LIFE

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NUMERICALLY MODELLING THE DEFORMATION AND FAILURE PROCESSES OF STRUCTURES UNDER QUASISTATIC TERMAL-STRESS AND THERMAL-RADIATION LOADING FOR ASSESSING THEIR STRENGTH AND RESIDUAL LIFE

Main results:

- In cooperation with OKBM researchers, mathematical models have been developed describing the processes of deformation and failure of materials, accounting for the effects of elasto-plastic behavior and development of damage, coupling of deformation and failure processes, effects of the type of the stressed-strained state on the nature of these processes, peculiarities of the behavior of materials under cyclic loading. The developed models take into account the history of irreversible deformation of materials under proportional and non-proportional thermal-stress loading, changes in material properties as a result of damage accumulation, main stages of the damage accumulation process, effects of the trajectory type and parameters of the stressed-strained state on the rate of the damage accumulation process, as well as the main effects of the behavior of structural materials under thermal-stress loading. T he proposed models are equipped with the required experimental data based on the related material functions obtained as a result of specific basic experiments carried out on the test installations at the Research Institute for Mechanics;
- A number of models have been developed that make it possible to describe the elasto-viscoplastic behavior of stainless steels and structural graphites, accounting for the effects of radiation-induced change of form, thermal-radiation creep, anisotropy of elastic properties of graphites, and dependence of the deformation characteristics of these materials on the temperature and the degree of neutron exposure;
- Based on the proposed models, methodologies, numerical schemes and algorithms of the FE-analysis have been developed for analyzing nonlinear quasistatic problems of deformation and failure of structures for the given laws of change of thermal-stress and thermal-radiation effects. The developed means implemented in the UPAKS (VK UPAKS) computational complex makes it possible to numerically model the processes of elasto-viscoplastic deformation, damage accumulation and development of defects in structural materials used in modern engineering and to estimate their strength and service life.

Leading expert:

- Sergey Arkadievich Kapustin, Doctor of Sciences (Physics and Mathematics), Professor.

The main scientific basis:

- Original theories, methodology and software, including the UPAKS certificated software complex;
- The automated complex for obtaining standard physical-mechanical characteristics (GOST 1497, GOST 10006, GOST 9651, ASTME 8, EN 10002), parameters of deformation models under monotonic loading, parameters of cyclic deformation hardening, parameters of high-temperature short-term creep on the basis of the modernized UME-10TM machine;
- The automated complex for obtaining the parameters of low-cycle and high-cycle fatigue (GOST 25.502, GOST 25.503), parameters of classical fracture mechanics. ( К 1 С … ), parameters of the model of stable growth of major cracks on the basis of the retrofitted URS-20/6000 machine and MIU-500 machine;
- The automated complex for obtaining the parameters of deformation models for monotonic loading, parameters of high-temperature creep and long-term strength, over the time base of about 450 hours (GOST 3248, GOST 9654-81 GOST 10145-81) on the basis of the Zwick/Roell Z030 test machine;
- The automated complex for obtaining creep and long-term strength parameters over the time base of ~ 1000 hours (GOST 3248, GOST 9654-81 GOST 10145-81) on the basis of the MIDP-30 test machine.

Main partners:

- OKBM Afrikantov,
- RFNC-VNIIEF.

Main customers:
- OKBM Afrikantov,
- RFNC-VNIIEF,
- RFNC-VNIITF.

Key projects (sources of financing):

- Project of the International Scientific and Technical Center (ISTC) " Development of a databank on dynamic properties of materials" No. 1203-01 (2001);
- Projects of the International Association for the Promotion of Cooperation with Scientists from the Independent States of the Former Soviet Union (INTAS) - Experimental and theoretical study of strength of brickwork under static and dynamic loading. 94-4383 (1996-1998), 2000-0600 (2003-2004 );
- Projects of the Federal Target Program “Integration” (1997-2004);
- The project in the program "Scientific research in higher education institutions in priority areas of science and technology (2001-2004)";
- The project in the inter-branch program of the Education Ministry and Ministry of Atomic Energy in the field "Cooperation in science and innovation" (2000-2004);
- Russian Basic Research Foundation grant 06-08-00360;
- Project 2.1.2/881 "Developing the methods and information facilities for assessing expended life and forecasting residual life of nuclear power plants using mathematical models and parameters of the working processes" in the Analytical departmental target program «Development of the scientific potential of higher school (2009-2010)»;
- Contract research commissioned by the following organizations: OKBM Afrikantov, RFNC-VNIIEF, RFNC-VNIITF, Atomenergoproject.

Main publications:

- Kazakov D. А ., Kapustin S. А ., Korotkikh Yu.G. Modeling the processes of deformation and failure of materials and structures. // Nizhni Novgorod. Publishing house of NNSU. - 1999. – 225 p.
- Kapustin S.A., Bukharev Yu.N., Mitin A.A., Churilov Yu.A. Numerically modeling the process of elasto-plastic deformation and failure of a standard specimen loaded in tension // Problemy mashinostroeniya i nadezhnosti mashin, No.3, 1998. Pp.52-56.
- Kapustin, S. А . Finite element method in problems of mechanics of deformable bodies: Study guide - Nizhni Novgorod: Publishing house of NNSU, 2002. -150 p.
- Kapustin S.A., Gorokhov V.A., Vilensky O.Yu., Kaydalov V.B., Margolin B.Z., Buchatsky A.A. Modeling the stressed-strained state of stainless steel structures under intensive thermal-radiation effects / S.A.Kapustin [et al.] //Problemy prochnosti i plastichnosti: Mezhvuz. sb. /N . Novgorod.-2007. – Issue 69. - Pp. 106 – 116.
- Kapustin S.A. , Kuznetsov А . М ., Urlin S.O., Bragov A.M., Lomunov A.K., Slepnev Yu.G. A databank for the informational support of the models of deformation and failure of materials and media [et. al.] // Vestnik NNSU. Ser. Mekhanika. - 2006. – Issue 1 (7). – Pp. 141-149.
- Gorokhov V.A., Kapustin S.A. , Churilov Yu.A. Modeling the elasto-viscoplastic behavior of products made of structural graphites, accounting for the peculiarities of their deformation under thermal and radiation loading // Thesis of the reports for the 17th session of the International school on models in continuum mechanics. - Saratov , 2007. - Pp. 37.
- The UPAKS computational complex. Scientific and technical center for nuclear and radiation safety. Attestation certificate of the software. Registration certificate of attestation PS No. 147 dated 31.10.2002.
- S.A.Kapustin, D.A.Kazakov, Yu.A.Churilov, A.I.Galushchenko, A.M.Vakhterov. The experimental and theoretical study of the behavior of products made of a heat-resistant alloy under high-temperature creep // Problemy prochnosti i plastichnosti: Mezhvuz. sbornik/. N.Novgorod.-2008. - Issue 70. – Pp. 100-111.

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