Work number - M 41 AWARDED
Presented Kremenchuk Mykhailo Ostrogradskyi National University
Authors:
Shlyk Sergii, Chencheva Olga, Klets Dmytro, Lashko Evgeny
The aim of the work is to increase the technical and economic indicators of technological processes of pulse processing of metals and tools for their diagnostics based on the development of theoretical foundations of shape change under the action of pulsed influence and calculation of power parameters.
The further equation of the stress state at the point of the material under the conditions of pulse loading was obtained, the methods for determining the principal stresses and the invariant of the stress tensor considering the pulse nature of the load were established. The nature of the formed shock wave behavior due to the detonation of an explosive has been established. Analytical dependences of the interaction of the shock wave with the loaded surface are made. A mathematical apparatus for calculating such parameters of the shock wave as the pressure of the detonation front and its change in time and the velocity of the shock wave at the time of reaching the surface has been developed.
The authors developed and proposed an iterative procedure that allows to determine the current values of stresses and strains passing through the points of the actual stresses curve, as well as the stresses and strains intensity during pulse processing of metals.
Based on the solution of the equilibrium equations in the collision of the flyer plate (clad) with the target plate in the process of explosion welding, the dependences of the dynamic compressive stresses on the resulting explosive load pressure are obtained. This makes it possible to determine the mechanism of deformation of the cladding layer under pulse loading before and during the collision with the target plate.
A qualitative analysis of the developed models is performed and the values obtained during numerical simulation in the Ansys AUTODYN of the stress-strain state of shell workpieces during the explosive expansion using an iterative procedure with full-scale experiments are performed.
An experimental study of the Quardian 500 steel dynamic explosive load and comparison of the obtained results with the analytical calculations obtained in the Ansys AUTODYN using the developed iterative procedure. The adequacy of the developed mathematical model of numerical simulation of explosive loading to results of field experiment is defined.
Using the analytical method proposed in the work, the theoretical calculation of mine resistance of the KrAZ "Shrek" and KrAZ "Fiona" MPV’s bodies was performed in accordance with the requirements of the NATO AEP-55 STANAG 4569 standardization agreement.
Number of publications: 27 articles (27 in English-language journals with an impact factor). The total number of references to the authors' publications / h-index of the work, according to the databases are: Web of Science – 0/0, Scopus – 148/7, Google Scholar – 192/8.
Версія для друку