Theoretical analysis, infrared and structural investigations of energy dissipation in metals under cyclic loading
TypeArticles dans des revues avec comité de lecture
The infrared and structural investigations of energy dissipation processes in metals subjected to cyclic loading have given impetus to the development of a new thermodynamic model with the capability of describing the energy balance under plastic deformation. The model is based on the statistical description of the mesodefect ensemble evolution and its influence on the dissipation ability of the material. Constitutive equations have been formulated for plastic and structural strains, which allow us to describe the stored and dissipated parts of energy under plastic flow. Numerical results indicate that theoretical predictions are in good agreement with the experimentally observed temperature data.
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PLEKHOV, O.A; PALIN-LUC, Thierry; SAINTIER, Nicolas; UVAROV, S.; NAIMARK, O.B (Blackwell, 2005)The present work is devoted to the investigation of fatigue crack initiation and growth in middle-cycle fatigue (∼105 cycles). Smooth specimens made of 35CrMo4 quenched and tempered steel were loaded in fully reversed plane ...
PLEKHOV, O.A; NAIMARK, O.B; SAINTIER, Nicolas; PALIN-LUC, Thierry (Pleiades Publishing, 2009)The structural and thermodynamic features of the elastic–plastic transition in armco iron and its plastic deformation are studied. Energy storage in iron is shown to have a nonlinear character and be accompanied by wavelike ...
Experimental Investigations of Anomalous Energy Absorption in Nanocrystalline Titanium under Cyclic Loading Conditions PLEKHOV, O.A; NAIMARK, O.B; VALIEV, R.Z; SEMENOVA, I.P; SAINTIER, Nicolas; PALIN-LUC, Thierry (Wiley, 2008)An infrared thermographic scanning technique has been used to study the energy absorption and dissipation under cyclic loading conditions in the nanostructural bulk titanium obtained by severe plastic deformation of an ...
Experimental and Theoretical Study of Multiscale Damage-Failure Transition in Very High Cycle Fatigue BETEKHTIN, V.I.; KADOMTSEV, A.G.; NARYKOVA, M.V.; BANNIKOV, M.V; ABAIMOV, S.G.; AKHATOV, I. S.; PALIN-LUC, Thierry; NAIMARK, O.B. (Pleiades, 2017)Multiscale mechanisms of failure of metals (Armco iron, titanium, aluminum) are studied for high cycle and very high cycle fatigue. By correlating with the results of structural studies, a theoretical approach is developed ...
About the effect of plastic dissipation in heat at the crack tip on the stress intensity factor under cyclic loading RANC, Nicolas; PALIN-LUC, Thierry; PARIS, Paul C.; SAINTIER, Nicolas (Elsevier, 2013)Because of the reverse cyclic plastic zone at the crack tip, there is plastic dissipation in heat at the crack tip under cyclic loading. That creates a heterogeneous temperature field around the crack tip. A thermo-mechanical ...