Stress–Strain State of a Two-Layer Circular Orthotropic Plate with Low Shear Stiffness

2014 ◽  
Vol 50 (5) ◽  
pp. 593-604
Author(s):  
P. M. Kirakosyan ◽  
S. P. Stepanyan
Keyword(s):  
Orthotropic Plate ◽  
Strain State ◽  
Shear Stiffness ◽  
Stress Strain ◽  
Stress Strain State ◽  
Low Shear Stiffness ◽  
Low Shear

scholarly journals A transient dynamic process in a structural nonlinear system “beam – two-parameter foundation”

2020 ◽  
Vol 310 ◽  
pp. 00007
Author(s):  
Vladimir Gordon ◽  
Pavel Morrev ◽  
Olga Pilipenko
Keyword(s):  
Cross Section ◽  
Strain State ◽  
Shear Stiffness ◽  
Arbitrary Cross Section ◽  
Forced Oscillations ◽  
Stiffness Parameter ◽  
Stress Strain ◽  
Stress Strain State ◽  
Internal Forces ◽  
Two Parameter

A method for analytical assessment of dynamic added stress in elastic loaded beam resting on elastic two-parameter Pasternak’s foundation due to sudden destruction a part of foundation is proposed. Equations of static bending, natural and forced oscillations are written in a matrix form using state vectors including deflection, rotational angles, bending moments, and shear forces at arbitrary cross section of a beam and also using the matrices of the initial parameters influence on the stress-strain state in arbitrary cross section. The influence of foundation failure on beam’s stress-strain state, taking into account a relation between the stiffness parameters of foundation, is analyzed. The condition of smallness for the shear stiffness parameter (Pasternak’s parameter) in comparison with the stretching-compressing stiffness parameter (Vinkler’s parameter) is accepted. It is shown that the accounting of Pasternak’s parameter reduces the level of dynamic added stress in a beam when sudden destructing of a foundation. The factor of sudden defect occurrence in the system “beam – foundation” increases considerably the internal forces in a beam in comparison with quasistatic formation of the same defect.

Stress-strain state of an orthotropic plate under pulse loading

2018 ◽  
Author(s):  
I. V. Scherbakov ◽  
B. A. Lukshin ◽  
S. V. Panin
Keyword(s):  
Orthotropic Plate ◽  
Strain State ◽  
Pulse Loading ◽  
Stress Strain ◽  
Stress Strain State

scholarly journals Comparative statement analysis of span structures with a reinforced concrete and orthotropic plate under the exposure of solar radiation

2021 ◽  
Vol 263 ◽  
pp. 03020
Author(s):  
Sergey Gridnev ◽  
Igor Podlesnykh ◽  
Aleksandr Rezunov ◽  
Rinat Mukhtarov
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Reinforced Concrete ◽  
Solar Radiation ◽  
Orthotropic Plate ◽  
Strain State ◽  
Field Measurements ◽  
Stress Strain ◽  
Steel Reinforced Concrete ◽  
Stress Strain State

Carried out a comparative analysis especially the exposure to solar radiation on the stress-strain state (SSS) of span structures with orthotropic slabs of reinforced concrete. Determine the character limit of the temperature distribution in the elements of the two types of spans according to the results of field measurements. Conducted calculation of Stress-Strain State on specific cases of solar radiation with the use of the developed finite element (FE) models of two types of span structures in the platform LIRA SAPR. The results of SSS features obtained for a steel-reinforced concrete superstructure and a metal superstructure with an orthotropic slab are compared. It is shown that the uneven daytime change in the temperature field under the influence of solar radiation has a significantly different nature of effect on the stress-strain state of elements of metal and steel-reinforced concrete span structures.

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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