scholarly journals Cold stamping of a cartridge case blank for 40x53 mm caliber grenade launcher ammunition

2021 ◽  
Vol 5 (3) ◽  
Author(s):  
Mikhailo Orlyuk ◽  
Pimanov Pimanov ◽  
Vitaliy Zhukov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Computer Modeling ◽  
Rational Method ◽  
Cold Extrusion ◽  
Deformation Pattern ◽  
The Finite Element Method ◽  
Research Results ◽  
Cartridge Case ◽  
Element Method

Problems. The choice of a rational method for stamping blanks with two hollows is usually carried out according to the permissible degree of deformation, the coefficient of material utilization, and the productivity of the process without taking into account the effect of the deformation pattern on the final mechanical properties of the stamped semi-finished product. Purpose of the study. Determination of a rational method for stamping a blank of a 40x53 mm grenade launcher cartridge case based on the results of computer modeling using the finite element method. Cartridge case material - AD35 aluminum alloy. The workpiece has two hollows with different diameters and depths. Implementation technique. By means of computer modeling using the finite element method, two options for stamping of a workpiece are researched - double-sided extrusion and sequential reverse extrusion with tilting of the workpiece. Research results. Based on the results of the research, the features of deformation according to the given schemes, as well as the energy-force parameters and parameters of the stress-strain state of the processes, are determined. It has been established that both methods make it possible to obtain blanks with specified geometric dimensions. At the same time, sequential back extrusion provides a more uniform and predictable deformation of the material along the cross-section of the workpiece, but loses in productivity to double-sided extrusion. Conclusions. The obtained research results can be used as criteria when choosing the optimal option for stamping of a workpiece with two hollows by cold extrusion.

scholarly journals MODAL ANALYSIS OF REINFORCED CONCRETE AND FIBER CONCRETE BEAMS

2021 ◽  
Vol 3 (1) ◽  
pp. 95-105
Author(s):  
T. Makovkina ◽  
◽  
M. Surianinov ◽  
O. Chuchmai ◽  
◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Computer Modeling ◽  
Natural Frequencies ◽  
Concrete Beams ◽  
The Finite Element Method ◽  
Fiber Concrete ◽  
Experimental Researches ◽  
Element Method

Analytical, experimental and numerical results of determination of natural frequencies and forms of oscillations of reinforced concrete and fiber concrete beams are given. Modern analytical, numerical and experimental methods of studying the dynamics of reinforced concrete and fiber concrete beams are analyzed. The problem of determining the natural frequencies and forms of oscillations of reinforced concrete and fiber concrete beams at the initial modulus of elasticity and taking into account the nonlinear diagram of deformation of materials is solved analytically. Computer modeling of the considered constructions in four software complexes is done and the technique of their modal analysis on the basis of the finite element method is developed. Experimental researches of free oscillations of the considered designs and the comparative analysis of all received results are carried out. It is established that all involved complexes determine the imaginary frequency and imaginary form of oscillations. The frequency spectrum calculated by the finite element method is approximately 4% lower than that calculated analytically; the results of the calculation in SOFiSTiK differ by 2% from the results obtained in the PC LIRA; the discrepancy with the experimental data reaches 20%, and all frequencies calculated experimentally, greater than the frequencies calculated analytically or by the finite element method. This rather significant discrepancy is explained, according to the authors, by the incorrectness of the used dynamic model of the reinforced beam. The classical dynamics of structures is known to be based on the theory of linear differential equations, and the oscillations of structures are considered in relation to the unstressed initial state. It is obvious that in the study of free and forced oscillations of reinforced concrete building structures such an approach is unsuitable because they are physically nonlinear systems. The concept of determining the nonlinear terms of these equations is practically not studied. Numerous experimental researches and computer modeling for the purpose of qualitative and quantitative detection of all factors influencing a spectrum of natural frequencies of fluctuations are necessary here.

scholarly journals Specific Design Solution for Covering Large Areas With Spatial Metal Truss

2021 ◽  
Vol 7 (12) ◽  
pp. 160-168
Author(s):  
A. Marufiy ◽  
E. Rysbekova
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Element Model ◽  
Computer Programs ◽  
Ring Structure ◽  
Design Solution ◽  
The Finite Element Method ◽  
Research Results ◽  
Spatial System ◽  
Element Method

. The relevance of the research results given in the article lies in the need to apply new constructive solutions for large spaces. The purpose of this work is to search for new design solutions for covering large areas with spatial metal trusses. The problems of forming a computational spatial bar finite element model of a steel spatial truss of a dome-shaped radial-ring structure were solved. The calculation of the spatial system was carried out using the finite element method of current computer programs, new constructive solutions for spatial metal trusses were adopted. The stress-strain states of the model from a given load have been determined. The calculation of the spatial system was carried out using the finite element method of current computer programs, new constructive solutions for spatial metal trusses were adopted. The research results can be used in the formation of architectural and structural solutions of a building using a new structural arrangement of the elements of a spatial truss.

scholarly journals Power and energy characteristics of concrete

2019 ◽  
Vol 135 ◽  
pp. 03057
Author(s):  
Daliia Khamidulina ◽  
Vladimir Rimshin ◽  
Andrew Varlamov ◽  
Svetlana Nekrasov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Crack Resistance ◽  
Experimental Studies ◽  
The Finite Element Method ◽  
Energy Characteristics ◽  
Research Results ◽  
Test Methodology ◽  
Power And Energy ◽  
Element Method

A new installation for testing concrete samples has been developed. The methodology for testing concrete samples with a crack has been clarified. Tested. Strength and energy characteristics of crack resistance of concrete samples are obtained. The results are presented in the form of graphs and tables. The results of experimental studies are compared with the theoretical characteristics of concrete obtained by modeling the behavior of concrete samples by the finite element method. The research results showed the possibility of using the proposed installation and test methodology in further studies.

Finite Element Analysis and Experimental Investigation of Sheet Metal Stretching

1973 ◽  
Vol 95 (3) ◽  
pp. 874-880 ◽  
Author(s):  
H. S. Mehta ◽  
S. Kobayashi
Keyword(s):  
Finite Element Method ◽  
Experimental Investigation ◽  
Finite Element ◽  
Sheet Metal ◽  
Excellent Agreement ◽  
Effective Strain ◽  
Deformation Pattern ◽  
The Finite Element Method ◽  
Flat Punch ◽  
Element Method

The finite element method was used to obtain the stress and strain distributions in sheet metal on nonaxisymmetric flat punch heads in stretching. Displacement boundary conditions were assumed. The experimental investigation was carried out by stretching securely clamped grid blanks with suitable punch heads; boundary displacements and strains were obtained from the observed deformation pattern on punch heads. A comparison with an experiment in terms of effective strain and thickness strain distributions and strains along the longitudinal axis reveals excellent agreement. The finite element method was also applied to bore expanding in a circular plate. Strain distributions were obtained for two types of materials, one isotropic and the other material having thickness anisotropy. The results showed excellent agreement with exact solution and experimental results.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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