Larin O. Theoretical basis of reliability prediction of machine elements with rubber-cord composites caused by fatigue failures

The object of study - the processes of fatigue damage accumulation in rubber-like materials taking into account the material aging. The scope of work - development of computational methods for the reliability analysis of rubber-cord composites and determination of mechanical engineering designs fatigue and aging life. Methods - theory of nonlinear elasticity, continuum damage mechanics, reliability theory, FEM. Theoretical and practical results are focused on the methods of calculation of reliability of engineering designs with rubber composites considering the random scatter of material props and stress variation, along with the material aging. A developed parametric models and script software have a practical value. Originality - the methods for predicting of reliability have been proposed based on probabilistic model of fatigue damage accumulation in hyperelastic material taking into account the stresses and material properties random variation over time. Experimental results have been obtained about the influence of aging on the rubber mechanical properties. A multiscale concept of deformed state modeling has been extended to the rubber-cord composites. Implementation of the results - PJSC "ROSAVA" (Bila Tcerkva), PJSC "INTERMIKRO Delta, Inc." (Dnipro), PJSC "AvtoKrAZ" (Kremenchug). Scope of usage - energy and transport engineering.