scholarly journals Factors of radial bone strength after marginal defect formation

2021 ◽  
Vol 27 (2) ◽  
pp. 187-198
Author(s):  
N.M. Aleksandrov ◽  
◽  
V.D. Veshutkin ◽  
A.E. Zhukov ◽  
I.D. Veshaev ◽  
...  
Keyword(s):  
Bone Strength ◽  
Defect Formation ◽  
Strength Properties ◽  
Affecting Factors ◽  
The Finite Element Method ◽  
Calculation Methods ◽  
Strain Behaviour ◽  
Intact Bone ◽  
Normal Strength ◽  
Radial Bone

Purpose To determine the effect of biometrical parameters of the radial bone and due to edge defect formed on the radius strength properties using calculation methods. Materials and methods The study of bone strength affecting factors was conducted with the aid of experimental and calculation methods. Biometrical parameters were studied in 10 pairs of the human cadaveric radius as an intact bone initially and after the formation of rectangular or triangle-shaped edge cuts. To determine the stress-strain behaviour, mathematical calculations were performed based on the beam flexural theory for isotropic materials. Computation study were conducted using the finite element method with the NX Siemens software package. Based on assumed mathematical models, the actual areas of safe loads in the presence of cuts and values of destructive loads depending on the depth and shape of a cut taking into account the initial curvature of the bone as well as the criteria of a required residual strength in variation of influencing parameters were identified by means of calculations. Results It was established that an increase in bone curvature results in the reduction of longitudinal destructive loads and in increasing values of the normal strength. The 0.05 bone curvature combined with the 0.5 cut causes a decrease in the ultimate load by 20 times (up to 4.8 % for a rectangular cut and to 5.4 % for a triangular cut). A 0.5-deep cut in the bone which curvature is 0.05 enhances the normal stress by 6.9 times for a triangular cut and by 7.8 times for a rectangular one as compared to a bone without curvature. The critical values for the curvature and depth of the cut were established which permit to avoid additional bone reinforcement. Conclusion The strength of the radius with a maginal defect depends not only on the depth of a cut but on its location, shape and on the radius curvature.

scholarly journals Ansys code applied to investigate the dynamics of composite sandwich beams

2021 ◽  
Vol 25 (1) ◽  
pp. 62-71
Author(s):  
Agnieszka Chudzik
Keyword(s):  
Sandwich Beam ◽  
Strength Properties ◽  
Effect Of Temperature ◽  
Material Strength ◽  
Beam Model ◽  
The Finite Element Method ◽  
Ansys Software ◽  
Composite Sandwich ◽  
Viscoelastic Core ◽  
Influence Of Temperature On

Abstract A numerical analysis of the effect of temperature on the dynamics of the sandwich beam model with a viscoelastic core is presented. The beam under analysis was described with a standard rheological model. This solution allows one to study the effect of temperature on material strength properties. Calculations were performed with the Finite Element Method in the ANSYS software. The analysis of the results of the numerical calculations showed a significant influence of temperature on the strength properties of the model under test. The analysis confirmed damping properties of viscoelastic materials.

scholarly journals ANÁLISE NUMÉRICA DE PERFIS DE AÇO FORMADOS A FRIO EM SEÇÃO “I” CONSTITUÍDA POR DUPLO “U” SUBMETIDOS À COMPRESSÃO

2020 ◽  
Vol 12 (1) ◽  
pp. 95-110
Author(s):  
Gabriel Cintra Macedo ◽  
Wanderson Fernando Maia
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Plate Thickness ◽  
Experimental Studies ◽  
Structural Behavior ◽  
The Finite Element Method ◽  
Geometric Imperfections ◽  
Initial Geometric Imperfections ◽  
Normal Strength ◽  
Double Channel

Although the section “I”, in double channel, is widely used, there are few studies on its behavior. Therefore, this work aims to contribute to a greater mastery over the structural behavior of this built-up sections. A nonlinear numerical analysis was performed using the Finite Element Method in the Ansys program, using existing experimental studies as a comparative database. The effect of length, number of connections, plate thickness and the presence of geometric and material imperfections on the normal strength of the columns. For this analysis, it was essential to consider the initial geometric imperfections, because there was a considerable reduction in the normal strength of the columns, thus getting closer to the values obtained experimentally. With regard to normative procedures, values against security were found in most cases, showing the need to conduct further studies in the area for the development of more appropriate formulations.

scholarly journals HIGH RISE FRAME BUILDING CONSTRUCTION WITH REGARD TO DEFECTS IN MONOLITHIC BASE SLAB

2020 ◽  
Vol 22 (5) ◽  
pp. 160-172
Author(s):  
S. V. Yushchube ◽  
I. I. Podshivalov ◽  
G. I. Tayukin
Keyword(s):  
Defect Formation ◽  
Strength Properties ◽  
Building Construction ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
High Rise ◽  
Frame Building ◽  
Concrete Layer ◽  
Non Destructive

The paper analyzes the influence of defects detected in a monolithic base slab on the possibility of its further application in the construction of a 25-storey high-rise frame building. Non destructive testing and vertical core sampling techniques are used for the detailed analysis of the monolithic base slab. It is found that irregularities in the procedure during winter concreting of the base slab decreases the strength properties of concrete and provides the defect formation in the slab structure, namely delamination of the lower protective concrete layer and uncovering of working reinforcement. For the safe use of the 25-storey high-rise building, the base slab is proposed to be strengthened by adding in-situ reinforced concrete layer 100 cm thick.

Calculation of Interaction Force between Pipe and Water of HVAC

2014 ◽  
Vol 1046 ◽  
pp. 165-168
Author(s):  
Zhi Bin Luo
Keyword(s):  
Interaction Force ◽  
Linearization Method ◽  
Hydraulic Calculation ◽  
Pipe Network ◽  
The Finite Element Method ◽  
Calculation Methods ◽  
Iterative Calculation ◽  
Network Utilization ◽  
Storage Node ◽  
And Storage

On the basis of the pipe network hydraulic calculation of basic theory, the pipe network utilization, using graph theory and peak array build relationships and storage node and pipe sections between the pipeline node associated with the hydraulic parameters of pipe sections linked together establish a common heating pipe network hydraulic calculation models. Matrix for the model were derived solving ideas based on the finite element method and linearization method for existing node equation method to improve to get a new heating network hydraulic calculation methods common to construct a new iterative calculation equation, to improve the convergence of iterative calculation.

scholarly journals Microstructure and properties of the mullite‒ZrO2(Y2O3)‒Si3N4-composite ceramics sintered in different ways

2018 ◽  
pp. 49-54
Author(s):  
G. Sedmale ◽  
L. Grasse ◽  
I. Zalite ◽  
N. Zhilinska ◽  
Ya. Rodriges
Keyword(s):  
Phase Composition ◽  
Comparative Analysis ◽  
Conventional Method ◽  
Elasticity Modulus ◽  
Defect Formation ◽  
Strength Properties ◽  
Composite Ceramics ◽  
Ceramic Samples ◽  
Spark Plasma ◽  
Plasma Methods

The research objective was to investigate the packing degree, phase composition, microstructure and some other properties of the mullite‒ZrO2composite ceramics with the Si3N4addition sintered in different ways, such as: by the conventional method, by the spark-plasma method, and both in the microwave and solar ovens. The comparative analysis was carried out for the strength properties (these were the ultimate compressing strength and the elasticity modulus) for the ceramic samples which had been sintered by means of the conventional and of the spark-plasma methods. Some reasons for the defect formation in the samples after their sintering in the microwave and solar ovens were mentioned.Ill.8. Ref. 10. Tab. 2.

scholarly journals Design, Simulation and Optimization of an Additive Laser-Based Manufacturing Process for Gearbox Housing with Reduced Weight Made from AlSi10Mg Alloy

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 67
Author(s):  
Liubov Magerramova ◽  
Vladimir Isakov ◽  
Liana Shcherbinina ◽  
Suren Gukasyan ◽  
Mikhail Petrov ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Strength Properties ◽  
Body Parts ◽  
The Finite Element Method ◽  
Technological Parameters ◽  
Simulation And Optimization ◽  
Precision Casting ◽  
Production Techniques ◽  
Material Forming ◽  
Physical And Mechanical Characteristics

The gas turbine engine's (GTE) development aims for the increasing the efficiency, strength, reliability and safety of its components. To create competitive engines, housing parts and components with high functionality and reduced weight are needed. Especially difficult in the design and production are the gearboxes for aviation GTE. Traditional technologies based on precision casting or material forming operations have significant limitations due to the complexity of fulfilling multiple different requirements. Nowadays, one of the progressive production techniques is additive manufacturing. The article presents the results of computational and experimental studies that substantiate the applicability of laser additive technology to reduce the mass of body parts by up to 15% while ensuring their strength properties. The physical and mechanical characteristics of aluminum alloys acceptable for the manufacturing of housing parts were analyzed. The necessary characteristics of the powder alloy of the Al-Si system and the technological parameters of the L-PBF of the modified housing of the gear reducer are established. Using the finite element method (FEM) the L-PBF process was numerically simulated and the technological modes for synthesis of the AlSi10Mg alloy powder were optimized. With the help of a serial 3D printer ProX320DMP, the prototype of a gear housing was manufactured.

114 Effect of Collagen Matrix on Bone Strength Properties

2006 ◽  
Vol 2006.45 (0) ◽  
pp. 27-28
Author(s):  
Masahiro TODOH ◽  
Shigeru TADANO ◽  
Yusuke IMARI
Keyword(s):  
Bone Strength ◽  
Collagen Matrix ◽  
Strength Properties

scholarly journals The problem solution of deformable power surfaces from anisotropic material interaction in elements of structure constructions

2018 ◽  
Vol 196 ◽  
pp. 02013
Author(s):  
Boris Ivanov ◽  
Alexander Pischulev ◽  
Galina Reazanova
Keyword(s):  
Anisotropic Material ◽  
Complex Form ◽  
Strength Properties ◽  
Problem Solution ◽  
Method Of Calculation ◽  
Strain Behaviour ◽  
Metal Products ◽  
Anisotropic Elastic ◽  
Bridge Bearings ◽  
Material Interaction

The paper presents an analytical method of examining deformable power surfaces from anisotropic material and their interaction. Materials with anisotropic properties are often used in the elements of transport structures as well as in building construction [1-7]. Most frequently the following materials are used in construction: rolled metal products, products obtained by drawing, wires of various kinds, reinforced concrete structures, bridge bearings, supporting walls and other structures, composite materials, plastics and other [8-13]. For forecasting strength properties of structures strength joints and their behaviour under various external influences, the authors developed a method of calculation of their stress-strain behaviour [9]. This method can be applied to strength joints of complex form made of anisotropic elastic elements under specific conditions of deformation of the contact surfaces.

scholarly journals Elder Chinese Martial Art Practitioners Have Higher Radial Bone Strength, Hand-Grip Strength, and Better Standing Balance Control

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Shirley S. M. Fong ◽  
X. Guo ◽  
Alice P. M. Cheung ◽  
Alex T. L. Jo ◽  
Gary K. W. Lui ◽  
...  
Keyword(s):  
Grip Strength ◽  
Bone Strength ◽  
Distal Radius ◽  
Balance Control ◽  
Hand Grip Strength ◽  
Standing Balance ◽  
Martial Art ◽  
Hand Grip ◽  
Dominant Side ◽  
Radial Bone

This study explored the feasibility of using Ving Tsun (VT) martial art as a fall-prevention exercise for male seniors. We compared the radial bone strength, hand-grip strength, and standing balance control of senior VT practitioners and nonpractitioners under various sensory environments. Sixteen male VT practitioners (mean age ± SD: years) and 17 sex- and age-matched control adults (mean age ± SD: years) participated in the study. The bone strength of the distal radius, hand-grip strength, and standing balance control were assessed using an ultrasound bone sonometer, a Jamar dynamometer, and sensory organization test (SOT) on the NeuroCom Balance Master, respectively. A multivariate analysis of variance (MANOVA) was used to compare the outcome variables between the two groups. Results revealed that VT practitioners had significantly higher radial bone strength (-score) on the dominant side (), hand-grip strength (dominant side, ; nondominant side, ), and standing balance control (SOT composite equilibrium score, ) than the control participants. Male elder VT practitioners had higher radial bone strength, hand-grip strength, and better standing balance control than nonpractitioners. Our findings shed light on the use of VT exercise to prevent falls and fall-related fractures of the distal radius in male elders.

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