Numerical investigation of the stress-strain state of flexible shells of rotation

1981 ◽  
Vol 13 (12) ◽  
pp. 1518-1522
Author(s):  
Yu. L. Golda ◽  
I. N. Preobrazhenskii ◽  
S. I. Tarakanov
Keyword(s):  
Numerical Investigation ◽  
Strain State ◽  
Stress Strain ◽  
Stress Strain State ◽  
Flexible Shells

scholarly journals Numerical research of horizontally weighted bases from hollow circular piles with the reduced step

2016 ◽  
Vol 4 (2) ◽  
pp. 0-0
Author(s):  
Светлана Ямаева ◽  
Svetlana Yamaeva ◽  
Олег Денисов ◽  
Oleg Denisov
Keyword(s):  
Comparative Analysis ◽  
Computational Model ◽  
Numerical Simulations ◽  
Numerical Investigation ◽  
Strain State ◽  
Full Scale ◽  
Stress Strain ◽  
Stress Strain State ◽  
Numerical Research ◽  
Full Scale Tests

The results of numerical investigation of the stress-strain state of subgrade groups of hollow circular piles with diameters of less than three step under the action of horizontal loads. Shows the effect of pitch on piles move horizontally loaded the bases and a comparative analysis of the nature of their work with full-scale tests and numerical simulations. Pseudoplane used computational model of the foundation for the theory of local deformations and linearly deformable half.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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