Analysis of the stress-strain state in carburized gearwheels

2021 ◽  
pp. 13-20
Author(s):  
N. I. Kitaev ◽  
S. Ya. Pichkhidze
Keyword(s):  
3D Model ◽  
Gear Wheel ◽  
Static Strength ◽  
Simulation Software ◽  
Chemical Heat Treatment ◽  
Structural Alloy ◽  
Chemical Heat ◽  
Working Surface ◽  
Before And After ◽  
Static Fracture

This article studies the static strength, static fracture and stiffness of the teeth of a wheel made of structural alloy steel of 12KhN3А grade before and after the carburizing of the working surface. The results of the analysis show that the static strength and static destruction of the part before and after chemical heat treatment are approximately equal, however, the gear wheel, strengthened by this method, has a higher hardness. The study and simulation of the applied loads were carried out using a 3D-model in the SolidWorks 2018 Simulation software.

scholarly journals Experimental and Numerical Study of Fracture Behavior of Rock-Like Material Specimens with Single Pre-Set Joint under Dynamic Loading

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2690
Author(s):  
Bo Pan ◽  
Xuguang Wang ◽  
Zhenyang Xu ◽  
Lianjun Guo ◽  
Xuesong Wang
Keyword(s):  
Crack Initiation ◽  
Crack Propagation ◽  
Joint Angle ◽  
Simulation Software ◽  
Dissipated Energy ◽  
Energy Structure ◽  
Joint Angles ◽  
Crack Penetration ◽  
Before And After ◽  
The Impact

The Split Hopkinson Pressure Bar (SHPB) is an apparatus for testing the dynamic stress-strain response of the cement mortar specimen with pre-set joints at different angles to explore the influence of joint attitudes of underground rock engineering on the failure characteristics of rock mass structure. The nuclear magnetic resonance (NMR) has also been used to measure the pore distribution and internal cracks of the specimen before and after the testing. In combination with numerical analysis, the paper systematically discusses the influence of joint angles on the failure mode of rock-like materials from three aspects of energy dissipation, microscopic damage, and stress field characteristics. The result indicates that the impact energy structure of the SHPB is greatly affected by the pre-set joint angle of the specimen. With the joint angle increasing, the proportion of reflected energy moves in fluctuation, while the ratio of transmitted energy to dissipated energy varies from one to the other. NMR analysis reveals the structural variation of the pores in those cement specimens before and after the impact. Crack propagation direction is correlated with pre-set joint angles of the specimens. With the increase of the pre-set joint angles, the crack initiation angle decreases gradually. When the joint angles are around 30°–75°, the specimens develop obvious cracks. The crushing process of the specimens is simulated by LS-DYNA software. It is concluded that the stresses at the crack initiation time are concentrated between 20 and 40 MPa. The instantaneous stress curve first increases and then decreases with crack propagation, peaking at different times under various joint angles; but most of them occur when the crack penetration ratio reaches 80–90%. With the increment of joint angles in specimens through the simulation software, the changing trend of peak stress is consistent with the test results.

Stress Study of Removable Partial Denture with Attachments Using Finite Element Analysis

2014 ◽  
Vol 658 ◽  
pp. 389-394
Author(s):  
Oana Cella Andrei ◽  
Livia Alice Tanasescu ◽  
Ruxandra Margarit ◽  
Mircea Horia Tierean
Keyword(s):  
3D Model ◽  
Sagittal Plane ◽  
Simulation Software ◽  
Von Mises Stress ◽  
Removable Partial Denture ◽  
Maximum Displacement ◽  
Partial Denture ◽  
Rotational Movement ◽  
Anterior Teeth ◽  
First Case

The paper presents the study of the stresses and the displacements that appear in different areas of the removable partial denture (RPD) with extracoronal attachments under occlusal loading, using FEA. The first step was to create the 3D model of a RPD with ball attachments in case of a class I Kennedy edentulous patient with all six anterior teeth as abutments. All materials were considered homogeneous, isotropic and having linear elasticity. There were assumed two types of constraints: in the first one the model is fixed under the action of the mastication forces; in the second one the rotational movement of the denture’s saddles in the sagittal plane was simulated, towards the edentulous ridge. In the first case, the 3D model and FEA were developed using Autodesk Inventor 2013 software. In the second case, the FEA was done using Autodesk Algor Simulation software. The loading of the model was symmetrically applied, considering the magnitude of the tangential and normal oral forces determined by Las Casas et al. These forces were applied to all the PM1, PM2, M1 and M2 pairs. Each loading case was analysed separately. The results of the two constrain situations are presented graphically, comparatively and show that the amount of the saddle displacement depends on the application area of the mastication force. Maximum displacement was computed at the application of the mastication forces on the M2 and decreases as the force is applied more mesial. The amount of the major connector’s deformation is very little influenced by the site of the force. The largest displacement of the denture was recorded at the distal end of the saddle, with values ​​that depend on the site of the forces. The existence of the rotational movement of the denture’s free end saddles in the sagittal plane, towards the edentulous ridge, changes the values ​​of accumulated stresses in denture during mastication and its Von Mises stress peaks. This analysis can be use to establish the principles of planning and designing the RPD with ball attachments having in mind to minimize the number of repairs caused by fractures of the components.

Comparative Analysis of Novikov and Involute Gearing in the ANSYS Workbench Software Package

2021 ◽  
pp. 16-21
Author(s):  
S.I. Karatushin ◽  
D.A. Khramova ◽  
N.A. Bildyuk
Keyword(s):  
Heat Treatment ◽  
Comparative Analysis ◽  
Software Package ◽  
Strain State ◽  
Gear Ratio ◽  
Geometric Parameters ◽  
Chemical Heat Treatment ◽  
Chemical Heat ◽  
Additional Hardening ◽  
Ansys Workbench

The paper introduces the results of studying the stress-strain state of the Novikov gearing in comparison with the involute gearing, similar in geometric parameters. In both versions, the wheel and gear are selected in size and gear ratio in accordance with the most common recommendations without additional hardening by chemical heat treatment. The zone of multiple contact of mated profiles is analyzed: changes in the geometry of contacts, pressure in the contact and stresses in various phases of gearing.

Chemical-heat treatment influence on thermal stability of microstructure, mechanical properties and fracture features of V-Cr-Ta-Zr alloy

2021 ◽  
pp. 36-42
Author(s):  
I.V. Smirnov ◽  
◽  
K.V. Grinyaev ◽  
A.N. Tyumentsev ◽  
A.D. Korotaev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Thermal Stability ◽  
Structural Phase ◽  
Strength Properties ◽  
Chemical Heat Treatment ◽  
Chemical Heat ◽  
High Level ◽  
Fracture Features ◽  
Zr Alloy

A study of the features of structural-phase state, thermal stability, mechanical properties characteristics and fracture features of V-Cr-Ta-Zr alloy after chemical-heat treatment by the method of nonequilibrium internal oxidation has been carried out. It has been established that, in contrast to chemical-heat treatment in a defect state, the effect of oxygen when introduced into a material with a stabilized structure is observed only at high concentrations. At such oxygen concentrations, which ensure the maximum binding of Zr into particles based on ZrO2, the alloy under study demonstrates a high level of thermal stability and strength properties. These effects are associated with the implementation of disperse strengthening according to the Orowan mechanism by nanosized ZrO2 particles characterized by high thermal stability. The concentration and nature of the distribution of oxygen predetermine the spatial distribution of nanosized ZrO2 particles formed during chemical-heat treatment, which manifests itself in fracture features of the material at different temperatures.

scholarly journals Effect of adding insulation on the energy performances of rammed earth buildings in hot and arid climates

2020 ◽  
Vol 150 ◽  
pp. 01011
Author(s):  
Wical Cheikhi ◽  
Khadija Baba ◽  
Abderrahman Nounah ◽  
Choukri Cherradi
Keyword(s):  
Good Alternative ◽  
Energy Performance ◽  
Simulation Software ◽  
Sustainable Construction ◽  
Rammed Earth ◽  
Before And After ◽  
Energy Consuming ◽  
High Level ◽  
Earth Walls ◽  
Raw Earth

In a world context focused on energy efficiency and sustainable construction, returning to the use of raw earth in construction constitutes a good alternative to concrete construction, a system more energy consuming and yet more used nowadays. This return is justified by the excellent energy performance and the high level of thermal comfort provided by earth constructions in different climates. In cold climates, adding an insulation on earth walls has proven to be effective in improving their thermal performances. However, the influence of adding an insulation on the energy performance of rammed earth buildings in hot and arid climates remains to this day little explored. The present work comes in this order of ideas; it is based on a comparative study of the energetic performances of a mud building before and after the addition of the insulation. In order to compare between their performances, we have performed a simulation of the thermal behaviour of each by the dynamic thermal simulation software Design Builder.

scholarly journals Verification of the working life of a ploughshare renovated by surfacing and remelting in the operation

2014 ◽  
Vol 60 (Special Issue) ◽  
pp. S98-S103 ◽  
Author(s):  
I. Kováč ◽  
N. Vanko ◽  
M. Vysočanská
Keyword(s):  
High Hardness ◽  
Working Life ◽  
Operating Conditions ◽  
Inert Gas ◽  
Material Surface ◽  
Chemical Heat Treatment ◽  
Functional Area ◽  
Chemical Heat ◽  
Coated Electrodes ◽  
Suitable Environment

The most common way of renovation of the working parts of agricultural machinery is surfacing by hardfacing coated electrodes and piped hardfacing wires. Another way to prolong the working life of the machinery is the chemical heat treatment of the material surface by nitriding. By nitriding, high hardness is obtained of the surface affected by a suitable environment and by raised temperature. This paper deals with the possibilities of increasing the lifetime of the functional area of a ploughshare by the surfacing piped wire and hardfacing electrodes and reshaping the surface layer in an argon and nitrogen environment by using a welding rectifier and the Tungsten Inert GAS method, and by validation of these methods of renovation in operating conditions.

Residual Compressive Stresses and Defects of Layers Hardened by Chemical Heat Treatment

Metallurgist ◽  
2013 ◽  
Vol 57 (7-8) ◽  
pp. 629-632
Author(s):  
I. P. Banas ◽  
L. V. Morozova ◽  
E. N. Korobova ◽  
O. V. Sedov
Keyword(s):  
Heat Treatment ◽  
Chemical Heat Treatment ◽  
Chemical Heat ◽  
Compressive Stresses

Finite Element and Modal Analysis for Connecting Rod Used in Piston Type Air Compressor

2014 ◽  
Vol 945-949 ◽  
pp. 3-6
Author(s):  
Xiao Xu Liu ◽  
Min Chen
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Modal Analysis ◽  
Dynamic Characteristic ◽  
3D Model ◽  
Static Strength ◽  
Connecting Rod ◽  
Air Compressor ◽  
Finite Element Stress Analysis ◽  
Finite Element Stress

The static strength and dynamic characteristic of connecting rod used in model 10/7 L type air compressor with double actions was studied, the 3D model of connecting rod was established by SolidWorks software, and the finite element stress analysis and modal analysis were done by ANSYS; the analysis results can be used as the base to improve the design of the connecting rod.

Simulation of New Wet Duster’s Nozzle Based on Fluent

2014 ◽  
Vol 556-562 ◽  
pp. 1133-1135
Author(s):  
Shan Shan Tang ◽  
Kai Song Wang ◽  
Chao Kun Wei ◽  
Teng Fei Ma
Keyword(s):  
3D Model ◽  
Water Pressure ◽  
Cone Angle ◽  
Wind Pressure ◽  
Safety Hazard ◽  
Field Simulation ◽  
Working Surface ◽  
Potential Safety ◽  
Normal Work ◽  
Nozzle Structure

Overweight of dust concentration is a common problem happened in most coal mine that not only affects workers’ normal work ,but also brings a great potential safety hazard to mine.New wet duster’ operating principle is that wind pressure and water pressure which generated in working surface pipeline network go through the nozzle jet and produce negative pressure leading the dust into dust catching pipe, and then the dust removed.According to optimizing the nozzle structure can increase spray’s cone Angle inside the shower nozzle,then the dust removal ability will be improved.The paper built the nozzle’ 3D model and the water’ the river basin model in SolidWorks ,then meshed them in Gambit and finally analysis the pressure and nozzle size’s influence on fluid’s pressure and velocity with Fluent’s flow field simulation.

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