scholarly journals DYNAMICS OF IMPACT OF ABRASIVES ON GEARS ON TEETH

2021 ◽  
Vol 05 (01) ◽  
pp. 38-41
Author(s):  
Nazim Ibrahimov
Keyword(s):  
Stress State ◽  
Wear Depth ◽  
Gear Teeth ◽  
Tangential Stresses ◽  
Tangential Forces

This article discusses the effect of abrasive between the leading and the driven gear teeth on the formation of a stress state. In this case, normal and tangential stresses are calculated under the action of normal and tangential forces Keywords: gears, abrasives, normal and tangential stresses, segmented shapes, fracture limit, wear depth.

scholarly journals DETERMINISTIC ANALYTICAL MODEL OF RESISTANCE TO DEEP CONTACT FATIGUE OF A STRESSED MATERIAL

2021 ◽  
Vol 3 (56) ◽  
pp. 52-60
Author(s):  
Sergei P. RUDENKO ◽  
◽  
Sergei G. SANDOMIRSKI ◽  
Keyword(s):  
Surface Layer ◽  
Stress State ◽  
Analytical Model ◽  
Structural Characteristics ◽  
Contact Fatigue ◽  
Contact Stresses ◽  
Radius Of Curvature ◽  
Tangential Stresses ◽  
Surface Contact ◽  
Tooth Surfaces

The stress state of the surface layer in the contact zone of the mating teeth of cylindrical gears is considered. It is shown that under contact loading, the stress state of the surface layer is inhomogeneous and changes with the distance from the surface. It is established that the value of the equivalent tangential stresses does not depend on the standard size of the gears, but is determined by the surface contact stresses σH. Moreover, the depth of occurrence of the maximum equivalent tangential stresses depends on the gear modulus (the reduced radius of curvature of the mating surfaces of the teeth) and, to a lesser extent, on the surface contact stresses σH. The inhomogeneity of the stress state and the structural characteristics of the diffusion layers of surface-hardened gears is a prerequisite for the appearance of critical zones in them, in which fatigue processes of contact failure can originate and develop. A deterministic analytical model of the resistance to deep contact fatigue of hardened tooth surfaces is proposed, based on determining the service life of the gear before the appearance of progressive deep contact chipping of the active tooth surfaces with a regulated variation of the microhardness values in different zones of the diffusion layer.

Calculation of Stress-Strain State and Contact Stresses in the Process of Chip Formation

2021 ◽  
Vol 313 ◽  
pp. 59-65
Author(s):  
A.V. Proskokov ◽  
A.S. Yanyushkin
Keyword(s):  
Stress State ◽  
Plastic Zone ◽  
Chip Formation ◽  
Strain State ◽  
Plane Stress State ◽  
Contact Stresses ◽  
Field Pattern ◽  
Plasticity Zone ◽  
Calculation Data ◽  
Tangential Stresses

The reported paper presents a field pattern of sliding lines in a plastic zone of flow chip formation in the process of cutting metals considered for front and rear angles on the cutting blade other than zero. Equations of sliding lines for these conditions are proposed. Using calculation data, plasticity zone border lines are plotted for positive and negative front angles. The paper suggests methods and calculation data on average stress and plane stress state components in nodal points of the plastic zone of chip formation. The study provides data for plotting distribution diagrams of normal and tangential stresses of contact stresses on work surfaces of a cutting blade.

Stress State Localized Analysis on the Tip of the Crack

2010 ◽  
Vol 449 ◽  
pp. 87-95 ◽  
Author(s):  
Pedro A. Tamayo Meza ◽  
Pablo S. Schabes-Retchkiman ◽  
Alejandra Lazo Noguez ◽  
Viacheslav A. Yermishkin
Keyword(s):  
Electron Microscope ◽  
Stress State ◽  
Single Crystal ◽  
High Voltage ◽  
Theoretical Calculations ◽  
Tangential Stresses ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
High Voltage Electron ◽  
Localized Analysis

In this paper is presented a study of the analysis of the stress state of micro specimens exposed to a load inside the column of a High Voltage Electron Microscope (HVTEM), in particular for a Mo single crystal. The experimental tangential stresses distribution images were obtained and compared with theoretical calculations using Naiber approach, obtaining an excellent match.

ROLLING BEARINGS IN CLUTCH WITH FLAT SPRING PACKAGES

2020 ◽  
pp. 14-17
Author(s):  
V. M. Zyablikov ◽  
S. Yu. Goncharov ◽  
S. S. Basova
Keyword(s):  
Stress State ◽  
Rolling Bearings ◽  
Tangential Stresses

When transmitting torque by coupling with flat spring packages, the latter experience not only bending but also tangential stresses from their twisting, which increases the overall stress state and reduces durability. The design of the coupling is proposed, in which the tips of the packages are installed in a half coupling on rolling bearings, which completely frees the flat springs from twisting, thereby increasing the durability and increasing the efficiency of the coupling.

scholarly journals Numerical and Analytical Calculations for Modeling and Designing Drilling Wicks or Rotary Cutters Based of Functionally Graded Materials

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Luc Leroy Mambou Ngueyep ◽  
Joseph Ndop ◽  
Elise Rose Atangana Nkene ◽  
Jean-Marie Bienvenu Ndjaka
Keyword(s):  
Hollow Cylinder ◽  
Numerical Solutions ◽  
Functionally Graded ◽  
Graded Materials ◽  
Tangential Stresses ◽  
Drilling Tools ◽  
Graded Material ◽  
Tangential Forces ◽  
Power Law Function ◽  
Distribution Of Stress

Drilling tools or drilling pipes, such as drill bit and mill drill, are often subjected to various forces, including essentially tangential forces, centered on their axis of rotation. The main objective of this work is to find analytical and numerical solutions of the distribution of stress field, deformation, and displacement, when such tools are subjected to such forces. It will be assumed that the instrument in the chosen model in this work is a rotating hollow cylinder constructed from a Functional Graded Material (FGM). Because of the graduation of the FGM, the mechanical and elastic properties such as Young’s modulus, density, and Poisson’s ratio vary in the radial direction according to a power law function. By choosing that the inhomogeneity parameter is between -0.5 and 0.5, we have established the differential equation which describes the equilibrium of the hollow cylinder in rotation under an axial load. The calculations performed have allowed finding an analytical solution which was compared with numerical solutions obtained by using the shooting method and the fourth-order Runge-Kutta algorithm. These analytical and numerical results have shown that the values of tangential stresses are greater than the radial stresses. The radial stresses and tangential and vertical stresses progressively increase with the axial force Fz. The force Fz affects more tangential stresses that the radial stresses. The tangential stress, tangential deformations, and displacements are higher on the inner walls of the cylinder than on the exterior surfaces. The results obtained are very important and can be applied in the modeling and designing wicks and drilling strawberries in order to reduce their rapid wear and damage.

scholarly journals STRESSED STATE OF A SYSTEM OF THREE PARALLEL TUNNELS WITHOUT DRAWING FROM OWN WEIGHT OF AN ANOTROPHONE ROCK MASSIF

2019 ◽  
Vol 45 (4) ◽  
pp. 162-171
Author(s):  
D. T. Bautdinov ◽  
M. M. Djamaludinov ◽  
K. S. Zhukova
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Isotropic Medium ◽  
Parametric Analysis ◽  
Transversely Isotropic ◽  
Rock Massif ◽  
Transversely Isotropic Medium ◽  
Tangential Stresses ◽  
Degree Of Anisotropy ◽  
Elastic Characteristics

Objectives. The aim of the study is to carry out a parametric analysis of the stress state of an anisotropic rock massif on the contours of the workings of a system of three parallel circular tunnels without lining due to the mass of the massif, for various ratios of the elastic characteristics of the rock massif in orthogonal directions, and at different distances del transverse isotropic medium. Method. The calculation of a system of three parallel tunnels without a large extension lining, laid in a strong transversely isotropic rock massif, is reduced to the problem of plane deformation of the theory of elasticity for a transversely isotropic medium containing parallel workings. A model of a transversely isotropic medium (a special case of an anisotropic medium) is used, in which the rock massif in one plane has the characteristics of an isotropic medium (the isotropy plane), and in the perpendicular direction, characteristics different from the isotropic medium. The stress state was investigated by the finite element method using the ANSYS software package. The sizes and type of the finite element suitable for calculation on the basis of the solution in the program complex of the verification task were previously determined. The Kirsch problem was accepted as the verification problem. Result. The relative tangential stresses on the contours of three parallel tunnels were determined depending on the degree of anisotropy of the rock mass and depending on the distance between parallel tunnels. The influence of the distance between the tunnels on the stress state on the contours of three parallel tunnels was evaluated, depending on the degree of anisotropy.Conclusion. The results of a parametric analysis of the system of three parallel free-flow tunnels without lining, depending on the degree of anisotropy of the rock mass and the distance between the tunnels, show that the stress state is significantly affected by the degree of anisotropy of the elastic properties of the soil massif and the distance between the tunnels. When designing underground structures, it is necessary to take into account the anisotropy of the elastic properties of the soil mass. It is also necessary to determine in more detail the physical and mechanical properties of rocky soils and pay special attention to elastic characteristics. As studies have shown, taking into account transverse-isotropy and the distance between the tunnels leads to both an increase and a decrease in tangential stresses on the contours of parallel tunnels. At some ratios of elastic characteristics in orthogonal directions, regardless of the distance between the tunnels, there are no tensile stresses on the contours of the tunnels, which favorably affects the operation of the hydraulic tunnel. 

Computational Tooth Root Stress Analysis of Crossed Beveloid Gears with Small Shaft Angle

2011 ◽  
Vol 86 ◽  
pp. 188-191 ◽  
Author(s):  
Chao Sheng Song ◽  
Cai Chao Zhu ◽  
Teik Chin Lim ◽  
Rong Fan
Keyword(s):  
Stress State ◽  
Design Parameter ◽  
Tooth Root ◽  
Tooth Contact Analysis ◽  
Gear Teeth ◽  
Beveloid Gears ◽  
Stress Prediction ◽  
Shaft Angle ◽  
Loaded Tooth Contact Analysis ◽  
Root Stress

It is known that tooth bending failures are directly caused by the stress state at the tooth root or fillet regions of the gear teeth. In this study, the geometric and manufacturing of the fillet and root of crossed beveloid are investigated and a computational tooth stress prediction model is setup applying exact geometry-based mesh theory. The dominate fillet and root design parameter and load were examined in the loaded tooth contact analysis to analyze root stresses.

Short Stress State Questionnaire

2015 ◽  
Vol 31 (1) ◽  
pp. 20-30 ◽  
Author(s):  
William S. Helton ◽  
Katharina Näswall
Keyword(s):  
Stress State ◽  
Factor Structure ◽  
Human Performance ◽  
Self Report ◽  
Confirmatory Factor ◽  
Stress States ◽  
Related Stress ◽  
Using Data ◽  
Task Conditions ◽  
Multiple Samples

Conscious appraisals of stress, or stress states, are an important aspect of human performance. This article presents evidence supporting the validity and measurement characteristics of a short multidimensional self-report measure of stress state, the Short Stress State Questionnaire (SSSQ; Helton, 2004 ). The SSSQ measures task engagement, distress, and worry. A confirmatory factor analysis of the SSSQ using data pooled from multiple samples suggests the SSSQ does have a three factor structure and post-task changes are not due to changes in factor structure, but to mean level changes (state changes). In addition, the SSSQ demonstrates sensitivity to task stressors in line with hypotheses. Different task conditions elicited unique patterns of stress state on the three factors of the SSSQ in line with prior predictions. The 24-item SSSQ is a valid measure of stress state which may be useful to researchers interested in conscious appraisals of task-related stress.

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