National University of Science and Technology “MISiS” (Moscow, Russia)

D. B. Efremov, Cand. Eng., Associate Prof., Dept. of Metal Forming
A. A. Gerasimova, Cand. Eng., Associate Prof., Dept. of Engineering of Technological Equipment, e-mail: gerasimova.aa@misis.ru
S. M. Gorbatyuk, Dr. Eng., Prof., Head of Dept. of Engineering of Technological Equipment
N. A. Chichenev, Dr. Eng., Prof., Dept. of Engineering of Technological Equipment, e-mail: chich38@mail.ru

The paper presents the study of kinematics of elastic-plastic deformation of hollow steel shapes. This study was aimed on improvement of the force parameters in plastic deformation processes of energy absorbing construction components of hollow shapes used in transport vehicles and rise of passive safety and reliability of technical equipment. Finite element modeling (FEM) of kinematics of the processes was conducted with control of energy absorbing parameters of steel tubes with different cross sections. Specific absorbing energy of all tested tubes was calculated using QForm program for imitation of technological processes as well as for analysis of power characteristics of plastic destruction of manufactured products and essential variation of their shape. The presented results of virtual investigations of bending and upsetting in an edge of a row of hollow shapes as tubes with different cross sections displayed wide possibilities for control and management of absorption process of mechanical energy via choosing the tube design and control of simulation results of energy absorption as well as maximal force on indicating diagram of deformation process. The results of testing testified that rectangular tube of 30×70 mm cross section absorbed more energy in comparison with tubes of other cross sections. However, bending of this tube was accompanied by ultimately high force value in the beginning of deformation, what means high value of object acceleration during its impact. On the contrary, force value decreased sharply at the finishing deformation stage, what increases the risk of deterioration in protected space of an object. Additional possibilities of improvement of functional properties of hollow components presented by tubes with longitudinal dikes were revealed; their usage allows to rise safety of transport vehicles, technological machines and equipment.

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