Abstract
Protective structures such as process chambers, protective boxes, facing elements of vehicles, personal protection equipment, motors cases etc. widely used in modern technology has been tested in the following project. Under the influence of impact loads, the three-dimensional dynamic stress-strain state with finite dynamic displacements and deformations has arised. The deformations occur in the elastic- plastic stage. In the analysis of the high-rate deformations, the dynamic properties of the materials, which are determined based on experimental data should be taken into account. The dynamic stress state of structural elements depends essentially on the dynamic properties of the materials used. The problem is solved using the finite element method, which takes into account the specifics of the process. Boundary conditions in the element nodes must satisfy the equality movement as well as derivatives. The formed function allows to describe continuous and smooth stress changes. The numerical analysis of the dynamic stress-strain state of structural elements under impact loads, takes into account different dynamic properties of the materials. A series of numerical calculations allows to reveal the features of high-rate deformation elements of protective structures and makes recommendations to improve their dynamic strength under different loading conditions.
Highlights
Introduction and problem statementA mathematical model for the analysis of the problem must take into account the heterogeneity of the material’s structural elements as originally given as well as arisen during high-rate deformation
Dependencies for stress from strains are determined based on a dynamic version of the theory of plastic deformation
Dynamic properties of the material have a significant influence on the development of high-rate process of elastic-plastic deformation of structural elements under intense impact loads
Summary
A mathematical model for the analysis of the problem must take into account the heterogeneity of the material’s structural elements as originally given as well as arisen during high-rate deformation. D quite accurately describes the dependence of the dynamic elastic limit the strain rate In numerical studies different dependencies for describing the dynamic properties of the material are used Their form is determined by the way of the experimental data processing used by different authors [1,2,3,4,5]. The functions formed allow to describe the continuous and smooth variation of stresses
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