Examination of the stress-strain state and selection of criteria for the optimum design of bolted joints with interference fit

1982 ◽  
Vol 14 (7) ◽  
pp. 902-908
Author(s):  
A. A. Lebedev ◽  
Ya. N. Robakovskil ◽  
S. �. Umanskii ◽  
I. V. Burau ◽  
Yu. L. Kozhevnikov ◽  
...  
Keyword(s):  
Optimum Design ◽  
Strain State ◽  
Bolted Joints ◽  
Stress Strain ◽  
Interference Fit ◽  
Stress Strain State ◽  
Selection Of

scholarly journals Selection of the Optimal FBG Length for Use in Stress-Strain State Diagnostic Systems

2019 ◽  
Vol 5 (12) ◽  
pp. 2700-2707 ◽  
Author(s):  
Viktor Vikulov ◽  
Aleksandr V. Todorov ◽  
Aleksey V. Faustov ◽  
Nikolay L. Lvov
Keyword(s):  
Construction Industry ◽  
Strain State ◽  
Civil Engineering ◽  
Bragg Gratings ◽  
Physical Principle ◽  
Diagnostic Systems ◽  
Stress Strain ◽  
Measuring Systems ◽  
Stress Strain State ◽  
Selection Of

The article discusses fiber-optic sensors (FOS) based on the Bragg gratings for measuring systems for diagnostics of stress-strain state. Currently, such diagnostic systems are widely used in construction, industry and civil engineering. The physical principle of deformation diagnostics using FOS. The issues of mounting the sensor on the measured area (detail) are separately discussed. The principle of processing the hardware and software of sensors based on Bragg gratings is described. Research method - bench experiments that were carried out on an equal-deformation beam in order to evaluate the change in the width of the reflected FOS peak at different lengths recorded by the Bragg gratings in order to determine the optimal one. The change in the spectrum of the reflected peak under various deforming influences was monitored. Based on the results obtained, recommendations are made on the use of gratings of various lengths in the diagnostic systems for the stress-strain state of parts and assemblies for civil engineering tasks.

scholarly journals INFLUENCE OF RIBBING ON THE STRESS-STRAIN STATE OF A FLAT ROUND TANK BOTTOM

2021 ◽  
Vol 112 ◽  
pp. 77-80
Author(s):  
А.K. Baibulov ◽  
◽  
N.V. Ivanitskaya ◽  
Keyword(s):  
Numerical Simulation ◽  
Strain State ◽  
Low Pressure ◽  
Correct Selection ◽  
Stress Strain ◽  
Stress Strain State ◽  
Head Surface ◽  
Tank Bottom ◽  
Rib Arrangement ◽  
Selection Of

Options with radial and longitudinal-transverse rib arrangement were considered. The research was carried out by numerical simulation in the ANSYS program. The values of stresses and deformations in the tank bottom were obtained depending on the number and location of stiffeners on it. It is established that the main load is perceived by the Central part of the ribs. Therefore, due to the correct selection of stiffeners, it is possible to reduce the thickness of the head plate. To equalize the stresses on the head surface, the number of edges should be at least six, and the radial placement of the edges is more preferable. With the same deformations, in this case, the stresses in the head are somewhat less. The results obtained make it possible to increase the strength of the flat head and use it in tanks intended for storing liquid and gaseous substances under low pressure.

scholarly journals ENGINEERING METHOD FOR SELECTION OF RATIONAL GEOMETRIC PARAMETERS OF MEMBRANE DRIVE OF THE MECHATRONIC SYSTEMS BASED ON STRESS-STRAIN STATE RESEARCH

2018 ◽  
Vol 0 (3(80)) ◽  
Author(s):  
Юрій Олексадрович Цибрій ◽  
Георгій Геннадійович Грабовський ◽  
Павло Леонідович Носко ◽  
Олександр Васильович Башта ◽  
Світлана Володимирівна Федорчук ◽  
...  
Keyword(s):  
Strain State ◽  
Geometric Parameters ◽  
Engineering Method ◽  
Mechatronic Systems ◽  
Stress Strain ◽  
Stress Strain State ◽  
State Research ◽  
Selection Of

Influence of harmonic components of non-circularity and non-cylindricity on the formation of stress-strain state of surface layers of parts in interference fit joints

2020 ◽  
pp. 3-7
Author(s):  
A.A. Zyuzin ◽  
I.S. Konstantinova ◽  
B.N. Kaz'min ◽  
M.D. Yurov
Keyword(s):  
Strain State ◽  
Low Frequency ◽  
Surface Layers ◽  
Stress Strain ◽  
Shape Deviation ◽  
Cross Sectional ◽  
Interference Fit ◽  
Stress Strain State ◽  
Shape Errors ◽  
Harmonic Components

The results of the study of the influence of the harmonic components of non-circularity and non-cylindricity on the formation of the stress-strain state (SSS) of the surface layers of parts in interference fit joints are presented. It is determined, that in order to increase the reliability of fixed joints of parts in the shape errors of high-precision mounting surfaces, it is necessary to minimize the amplitudes of the harmonic components of the low-frequency range of the 2nd, 3rd and 4th orders and form an isotropic microrelief. Keywords interference fit joints, non-circularity of cross-sectional profiles, harmonic components, non-cylindricity, microtopography, microasperities, stress-strain state, shape deviation spectra. [email protected]

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.

Sign in / Sign up

Export Citation Format

Share Document