Sensitivity of high strain rate of structural elements in relation to dynamics properties of material

¹ The Gen. Jaroslaw Dabrowski Military University of Technology, 2 Gen. S. Kaliski St., Warsaw 00-908, Poland
² A.N. Podgorny Institute of Mechanical Engineering Problems, National Ukrainian Academy of Sciences, 2/10 D. Pozharskoho St., Kharkov 61046, UKraine

^a Corresponding author: lkruszka@wat.edu.pl

Published online: 7 September 2015

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.