scholarly journals Peculiarities of stress-strain state of the conical stem of the hip endoprosthesis in different types of its fixation

2015 ◽  
Vol 0 (3) ◽  
pp. 21
Author(s):  
Oleg Loskutov
Keyword(s):  
Strain State ◽  
Stress Strain ◽  
Hip Endoprosthesis ◽  
Stress Strain State ◽  
Different Types

scholarly journals Modeling and assessment of the stress-strain state of above-ground pipelines at different types of compensation sections

2021 ◽  
Vol 266 ◽  
pp. 01022
Author(s):  
Z.A. Besheryan ◽  
I.F. Kantemirov
Keyword(s):  
Strain State ◽  
Complex Stress ◽  
Operating Conditions ◽  
The Arctic ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Stress Strain ◽  
Stress Strain State ◽  
Actual Operating ◽  
Different Types

The development of Russian fuel and energy complex in the short term is connected with the development of new hydrocarbon field in the permafrost zone and the need to build Arctic pipelines north of the 60th parallel. The ground-based structural scheme of pipeline laying is the most optimal while constructing trunk pipelines in permafrost areas in the Arctic and subarctic latitudes. The actual operating conditions of these systems are insufficiently studied. The above-ground pipeline in permafrost is in an complex stress-strain state. This study presents the results of the assessment of the stress-strain state of linearly extended above-ground pipelines at different compensation sections (triangular compensator; trapezoidal compensator; U-shaped compensator) under actual operating conditions. Using the finite element method on mathematical models, the dependences of the transverse displacements of the pipeline on movable supports and stresses arising in dangerous sections of the typical pipeline section during self-compensation of deformations on the variable design parameters of the system for various load combinations were established (the simulation was carried out in the ANSYS software package).

The Boundary Condition Influence on a Stress-Strain State of a Corrugated Plate on an Elastic Foundation

2018 ◽  
Vol 931 ◽  
pp. 60-65 ◽  
Author(s):  
Aleksey N. Beskopylny ◽  
Elena E. Kadomtseva ◽  
Grigory P. Strelnikov
Keyword(s):  
Boundary Condition ◽  
Elastic Foundation ◽  
Strain State ◽  
Polymer Coatings ◽  
Stress Strain ◽  
Stress Strain State ◽  
Different Types ◽  
Deformed State ◽  
Decorative Material ◽  
Construction Practice

In this paper, we consider the influence of the conditions for fixing a wavy plate lying on an elastic foundation on its stressed-deformed state. The profiled plates are widely used in construction practice as fencing structures, for siding works, for roofing and others. The stress-strain state of the wavy plates varies depending on geometry, materials mechanical properties, foundation characteristics and boundary condition. Steel with polymer coatings, which make the sheets a decorative material, is increasingly used in individual and low-rise buildings. The elastic foundation is considered as Winkler base, so we suppose that the reaction of the base is directly proportional to the deflection of the plate at each point. The Bubnov-Galerkin method is used to determine the stress-strain state of the plate. To solve the problem, we use special orthogonal Legendre polynomials satisfying the boundary conditions: simply supported and clamped edges. The results of the calculations were compared for different types of fixation.

Strength of Flexible Compressed Elements when Changing the Options of Composite Reinforcement and Application of the Load

2018 ◽  
Vol 931 ◽  
pp. 315-320 ◽  
Author(s):  
Petr P. Polskoy
Keyword(s):  
Strain State ◽  
Transverse Reinforcement ◽  
Stress Strain ◽  
Research Results ◽  
Stress Strain State ◽  
Different Types ◽  
Reinforcement Efficiency ◽  
Composite Reinforcement

The paper presents the research results of the strength of flexible () compressed elements reinforced with various options of external composite reinforcement. The purpose of the experiment is to determine various options of external transverse reinforcement efficiency for different types of stress – strain state of reinforced samples. Another task is to determine the possibility of reinforcing compression elements that exceed the normalized values in the ratio of section dimensions and elements flexibility.

scholarly journals Accounting for the flexibility of nodes in the design of steel mesh dome

2018 ◽  
Vol 245 ◽  
pp. 08006
Author(s):  
Egor Kanaev ◽  
Daria Demidova ◽  
Sergey Zimin
Keyword(s):  
Strain State ◽  
High Strength ◽  
Stress Strain ◽  
Strain Capacity ◽  
Stress Strain State ◽  
Semirigid Connections ◽  
Different Types ◽  
Internal Forces ◽  
The City ◽  
Geodesic Dome

This paper presents the results of a study of the stress-strain state of a geodesic dome covering the planetarium designed in the city of Nizhny Novgorod. Four design schemes were created in the SCAD with different types of node modeling. A comparative analysis of the effect of the strain capacity of the “BrGTU” type unit on the stress-strain state of the dome cover has been carried out. The results are obtained on the change in the displacements of the structure nodes and internal forces in the dome bars, with rigid and hinged mates. The option of increasing the diameter of high-strength bolts to reduce the overall deformability of the system is considered. On the basis of the obtained results, it was concluded that it is necessary to take into account the strain capacity of the semirigid connections when designing mesh steel domes.

Analysis of changes of stress-strain state in scapula labrum in different types of its damage

TRAUMA ◽  
2017 ◽  
Vol 18 (3) ◽  
pp. 27-37
Author(s):  
I.A. Lazarev ◽  
S.S. Strafun ◽  
V.M. Lomko ◽  
M.V. Skiban
Keyword(s):  
Strain State ◽  
Stress Strain ◽  
Stress Strain State ◽  
Different Types

scholarly journals Investigation of the effect of porous titanium cups on stress distribution in bone tissue (mathematical modeling)

TRAUMA ◽  
2021 ◽  
Vol 22 (3) ◽  
pp. 28-37
Author(s):  
S.Ye. Bondarenko ◽  
S.A. Denisenko ◽  
M.Yu. Karpinsky ◽  
O.V. Yaresko
Keyword(s):  
Mathematical Modeling ◽  
Bone Tissue ◽  
Strain State ◽  
Porous Titanium ◽  
Acetabular Roof ◽  
Stress Strain ◽  
Porous Tantalum ◽  
Hip Endoprosthesis ◽  
Stress Strain State ◽  
Solid Titanium

Introduction. During arthroplasty in patients with altered anatomy and osteoporosis of the acetabulum, stable fixation of the acetabular component of the endoprosthesis is a very difficult task. There are studies on the bone tissue bonding to titanium, tantalum and ceramic coatings of endoprostheses. However, there are insufficient data on the influence of the strength characteristics of modern surfaces of the cups for hip endoprostheses on the distribution of mechanical stresses in the bone tissue around the implanted components. The purpose was to study on a mathematical model the changes in the stress-strain state of the endoprosthesis-bone system as a result of using porous tantalum cup. Materials and methods. A mathematical modeling has been carried out of the stress-strain state of the human hip joint in arthroplasty with porous cup. Du-ring the study, a defect in the acetabular roof filled with a bone implant fixed with two screws was simulated, as well as a defect in the acetabular floor filled with bone “chips”. Endoprosthesis cups were modeled in two versions: from solid titanium with a spray coating of porous titanium, and those entirely made of porous titanium. A distributed load of 540 N was applied to the sacrum. A load was applied between the iliac wing and the greater trochanter of the femur simulating the action of the gluteus medius — 1150 N and the gluteus minimus — 50 N. Results. The use of a cup with a coating of porous titanium in the normal state of the acetabulum leads to the occurrence of maximum stresses (15.9 MPa) in its posterior-upper part. Minimum stresses of 4.6 MPa are observed in the center of the acetabulum. The use of an endoprosthesis with porous titanium cup allows reducing the level of stresses in the bone tissue around the cup. If there is a defect in the acetabular roof, a hip endoprosthesis with porous titanium cup causes less stress than a solid titanium cup with coating of porous titanium. But on the graft, the stress level remains practically unchanged, regardless of the type of cup. The use of porous tantalum cup in the presence of a defect in the acetabular floor causes significantly less stress in the bone tissue around it, compared to an all-metal cup with coating. Conclusions. The cup of the hip endoprosthesis made of porous titanium causes significantly less stress in all control points of the model, compared to a cup made of solid titanium with coating of porous titanium, both with defects in the acetabular roof and floor, and without bone defects.

scholarly journals Influence of cover splices on the stress-strain state of plate-ribbed wood-composite panels

2020 ◽  
Vol 16 (6) ◽  
pp. 439-451
Author(s):  
Boris V. Labudin ◽  
Egor V. Popov ◽  
Ekaterina S. Oshchepkova ◽  
Valery V. Sopilov ◽  
Anastasia V. Ruslanova ◽  
...  
Keyword(s):  
Composite Plate ◽  
Strain State ◽  
Oriented Strand Board ◽  
Stress Strain ◽  
Stress Strain State ◽  
Different Types ◽  
Composite Section ◽  
Vertical Displacements ◽  
Strength And Deformation ◽  
Dangerous Section

Wooden-composite plate-ribbed bent panels with structural plywood and oriented strand board sheathing with breaks are considered. An overview of studies researching and improving the effectiveness of different types of panels is presented. On the basis of the theory of calculation of composite rods by A.R. Rzha- nitsyn, a mathematical model has been compiled, which makes it possible to calculate the stress-strain state of these structures, taking into account the pre- sence of breaks in the sheathing and the flexibility of the mechanical fasteners of the sheathing and ribs. An equation for finding the coordinates of the most dangerous section of wooden ribs in the presence of breaks in the sheathing, which may not match with the middle of the span, is obtained. Panels with sheathing in a compressed zone with different locations of joints, symmetrically relative to the middle of the panel span are considered. Panels without joints in the skin are considered to compare the results. The graphs of the dependence of the maximum tensile stresses in the ribs in the most dangerous section and the maximum vertical displacements from the stiffness coefficient of the shear ties and the location of the breaks in the sheathing are presented. The values of the coefficients for the engineering design of panels, taking into account the decrease in the strength and deformation characteristics of the composite section of panels with breaks in the sheathing, as compared to panels with a solid sheathing, are obtained. The conclusions and recommendations, based on the results of the investigations, which can be used in the design of wooden-composite plate-ribbed structures, are formulated.

Sign in / Sign up

Export Citation Format

Share Document