Ovcharova N. Finite element analysis of high-rate deformation of protective elements of machine-building structures

The object of research is the process of high-rate deformation of elements of machine-building constructions under the influence of local shock and impulse loading. The proposes of the study is to determine the dynamic stress-strain state (SSS) of the protective elements of machine-building structures in the case of impulse and shock loads to ensure their effective use. Research methods - the theoretical positions are based on the nonlinear theory of elasticity, on the dynamic theory of plasticity and on the methods of mathematical modeling. Theoretical and practical results - determining the dynamic strength of the lining of vehicles (locomotives), elements of the corps of gas turbine engines (GTE) under impact loads by the foreign objects. Novelty - further development of the calculation models of three-dimensional high-rate elastic-plastic deformation of elements of transport and power engineering, which differ of account of the dynamic properties of materials. For the first time, dependences of stresses distribution on the impact velocity on spatial and temporal coordinates in the elements of the structures under investigation are obtained for the different materials. The new features of the process of high-rate deformation for elements of gas turbine engine corps with local loads were discovered. The new patterns of distribution of stresses and deformations in a three-layer element for separate layers were determined, depending on the speed of the projectile. The revealed general regularities of dynamic SSS in the corps elements contribute to the maintenance and increase of the dynamic strength of the GTE. Degree of implementation - the results are implemented at the Zorya-Mashproekt Gas Turbine Research and Development Complex and used on the Zaporozhye Machine-Building Design Bureau Progress State Enterprise Named Academician A.G. Ivchenko. Scope of application - the results of work are used in the engineering industry