Numerical Simulation of Deformations of Rotary and Stationary Rings of Contact Mechanical Seal Based on ANSYS Workbench

2014 ◽  
Vol 602-605 ◽  
pp. 633-637
Author(s):  
Peng Gao Zhang ◽  
Long Wei ◽  
Xiu Feng
Keyword(s):  
Friction Coefficient ◽  
Contact Pressure ◽  
Rotational Speed ◽  
Equivalent Stress ◽  
Ring Width ◽  
Mechanical Seal ◽  
Total Deformation ◽  
Contact Surfaces ◽  
Contact Mechanical ◽  
Ansys Workbench

The total deformation and contact pressure the equivalent stress of rotary and stationary rings of contact mechanical seal are numerical simulated by ANSYS workbench. The effects of spring pressure, friction coefficient, rotational speed of rotary ring, width of contact surfaces on deformation and contact pressure are analyzed. Results indicate that deformation of rotary and stationary rings increases with the increase of spring pressure and friction coefficient, however, decreases with the increase of rotational speed of rotary ring and width of contact surfaces. Contact pressure increases with the increase of spring pressure, however, decreases with the increase of friction coefficient and width of contact surfaces. The effects of spring pressure and friction coefficient on contact pressure are not obvious, and the effect of width of contact surfaces on contact pressure is very small when it is more than 3 mm.

Analysis and Optimization of Dismantling Machine Shear Head Based on ANSYS Workbench

2014 ◽  
Vol 945-949 ◽  
pp. 653-657
Author(s):  
Wan Peng Du ◽  
Yong Jian Zhang ◽  
Chen Quan Zhou ◽  
Ai Hui Zhang ◽  
Ji Yu ◽  
...  
Keyword(s):  
Topology Optimization ◽  
Shear Force ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Total Deformation ◽  
Design Variables ◽  
Maximum Shear Force ◽  
Maximum Equivalent Stress ◽  
Three Dimensional Models ◽  
Ansys Workbench

The object is dismantling machine shear head with 500kN’s maximum shear force. The three-dimensional models, static analysis, topology optimization were done in the ANSYS Workbench. And the goal driven optimization was done which based on topology optimization. The maximum total deformation, maximum equivalent stress and geometry mass were selected as objective parameters and the distance of two connecting holes, diameter of long hole and length of blade as design variables. At last, the optimized structure was checked. The strength and rigidity meet the requirements and the mass decreased.

Simulation Research of Banded Wedge and Synchronous V Belt Drive Based on ANSYS Workbench

2013 ◽  
Vol 341-342 ◽  
pp. 432-437
Author(s):  
Ying Wu ◽  
Xu Zhou
Keyword(s):  
Equivalent Stress ◽  
Transmission Mechanism ◽  
Von Mises Stress ◽  
Belt Drive ◽  
Active Force ◽  
Total Deformation ◽  
Simulation Results ◽  
Von Mises ◽  
Ansys Workbench ◽  
Maximal Equivalent Stress

For cutting down the stress and displacement of banded wedge and synchronous V belt drive in the transmission process, promoting the transmission mechanism, and improving quality of the belt drive, the working principle of the transmission mechanism was introduced briefly. The three dimensional solid model of the transmission mechanism constituted in pro/e; the main parameters of the model were set using ANSYS Workbench. And then the serialization simulation analysis of the transmission mechanism was achieved when the tension force is located in the point of the V belt exiting meshing with the driven wheel; the cloud diagram of Von Mises stress and the maximal Von Mises stress and total deformation of the transmission mechanism were elicited. The simulation results were analyzed. The simulation results show that the maximal equivalent stress and maximal total deformation of the transmission mechanism are determined by the size of the tensioning force when the active force is small. Augmenting the active force of the transmission mechanism the maximal equivalent stress increases effectively and the maximal total deformation changes little when the active force is large. Reducing becomingly the tensioning force in ensuring natural belt drive shall reduce effectively the maximal Von Mises stress of the transmission mechanism. Adjusting opportunely the location of the tensioning force the total deformation of the transmission mechanism reduces effectively.

Bearing Friction Torque in Threaded Fasteners With Non-Flat Underhead Contact

2018 ◽  
Author(s):  
Sayed A. Nassar ◽  
Marco Gerini Romagnoli ◽  
Joon Ha Lee
Keyword(s):  
Friction Coefficient ◽  
Contact Pressure ◽  
Friction Torque ◽  
Sliding Speed ◽  
Friction Coefficients ◽  
Threaded Fasteners ◽  
Tension Testing ◽  
Contact Surfaces ◽  
Flat Contact ◽  
Bearing Friction

This study provides experimentally validated formulation of underhead bearing friction torque component during tightening of threaded fasteners with non-flat contact with the joint. Motosh model is utilized for spherical and conical contact surfaces for various scenarios of contact pressure. For each pressure scenario, a single non-dimensional 3-D graph is generated for the corresponding values of an effective bearing friction radius. A rotating sliding speed-dependent friction coefficient model is also investigated for its impact of the results of bearing friction radius. Torque-Tension testing is used to measure the bearing friction torque and the corresponding bearing friction coefficients using Motosh model, in which the newly formulated bearing friction radius expressions are entered. Obtained bearing friction coefficient values are then compared with those published by the threaded fastener manufacturer.

The Lightweight Design and Improvement of Aluminum Alloy Automobile Wheel

2011 ◽  
Vol 63-64 ◽  
pp. 189-192 ◽  
Author(s):  
Ying Shi ◽  
Liang Wang ◽  
Peng Yu
Keyword(s):  
Aluminum Alloy ◽  
Elastic Strain ◽  
Maximum Stress ◽  
Lightweight Design ◽  
Equivalent Stress ◽  
Allowable Stress ◽  
Total Deformation ◽  
Element Analysis ◽  
Automobile Wheel ◽  
Ansys Workbench

This paper models the auto wheel by UG, and made analysis through ANSYS Workbench software. The result of finite element analysis shows that the maximum stress is much less than the allowable stress of aluminum alloy wheels. So auto wheels can be optimized further. Then structural optimization is made to minimize the weight of the wheel. The static analysis and fatigue analysis to the optimized wheel is made then. The results of equivalent stress, equivalent elastic strain and total deformation are similar with the results that before optimize, but its weight is decreased. It gains the goal of lighting weight, decreasing fuel consumption and reducing pollution.

Calculated Behavior and Effective Factors for Bolt Self-Loosening Under a Transverse Cyclic Load Generated by a Linearly Vibrating Washer

2005 ◽  
Author(s):  
Yasuo Fujioka ◽  
Tomotsugu Sakai
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Contact Pressure ◽  
Common Knowledge ◽  
Axial Direction ◽  
Element Analysis ◽  
Friction Coefficients ◽  
Friction Forces ◽  
Contact Surfaces ◽  
The Individual

It is common knowledge that a bolt is apt to loosen due to slippage between the contact surfaces of joined parts. Loosening tests using real parts enable precise scrutiny of real phenomena under the influence of multiple factors such as slip distance, surface roughness, and coefficient friction. However, estimating the influence of the individual factors is very difficult because the friction forces of real contact surfaces are compiled based on variations in friction coefficients, meaning friction is not stable. Therefore, the effects of factors were investigated using Finite Element Analysis (FEA) to control friction coefficients. The procedures were as follows. Assuming a joined structure consisting of a bolt, nut, and washer, bolt axial tension was generated through constant movement of a washer in the bolt’s axial direction, following which the washer was constantly vibrated in one direction transverse to the bolt axis. This vibration generated displacements equivalent to the degree of slippage between the two clamped parts. During vibration, the rotating angles of the bolt and the contact pressure of the threads and bearing surfaces were calculated. The results were as follows. The vibrating displacements of a washer have considerable influence on the rotational loosening of a bolt. In cases where there was only minor displacement of the washer vibrations, the rotational loosening angle rapidly decreased, although the loosening did not cease completely. Therefore, the magnitude of what is called “critical slip” was not confirmed under the conditions of this study. In addition, the friction coefficient has a significant influence on the rotational loosening of a bolt. When the respective friction coefficient values of the threads and bearing surfaces are not balanced, rotational loosening cannot continue. Surface roughness readily affects contact pressure, so it tends to make the contact pressure localized. In particular, high-pressure areas were affected by several projections set on the threads. However, under those conditions the rotational loosening did not differ greatly from the results of the fine surface models subject to the same vibrating amplitude and friction coefficient. Consequently, the localized contact pressure had little evident effect on loosening. Above all, FEA reproduced the loosening of the bolt, and the reference made in this analysis is useful.

Influence of the contact with friction on the deformation behavior of advanced high strength steels in the Nakajima test

2021 ◽  
pp. 030932472110212
Author(s):  
Mohammad Mehdi Kasaei ◽  
Marta C Oliveira
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Strain Rate ◽  
Contact Pressure ◽  
Deformation Behaviour ◽  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels ◽  
Deformation Mechanics ◽  
Nakajima Test

This work presents a new understanding on the deformation mechanics involved in the Nakajima test, which is commonly used to determine the forming limit curve of sheet metals, and is focused on the interaction between the friction conditions and the deformation behaviour of a dual phase steel. The methodology is based on the finite element analysis of the Nakajima test, considering different values of the classic Coulomb friction coefficient, including a pressure-dependent model. The validity of the finite element model is examined through a comparison with experimental data. The results show that friction affects the location and strain path of the necking point by changing the strain rate distribution in the specimen. The strain localization alters the contact status from slip to stick at a portion of the contact area from the pole to the necking zone. This leads to the sharp increase of the strain rate at the necking point, as the punch rises further. The influence of the pressure-dependent friction coefficient on the deformation behaviour is very small, due to the uniform distribution of the contact pressure in the Nakajima test. Moreover, the low contact pressure range attained cannot properly replicate real contact condition in sheet metal forming processes of advanced high strength steels.

scholarly journals A Proper Shape of the Trailing Edge Modification to Solve a Housing Damage Problem in a Gas Turbine Power Plant

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 705
Author(s):  
Thodsaphon Jansaengsuk ◽  
Mongkol Kaewbumrung ◽  
Wutthikrai Busayaporn ◽  
Jatuporn Thongsri
Keyword(s):  
Power Plant ◽  
Gas Turbine ◽  
Structural Dynamics ◽  
Pressure Ratio ◽  
Equivalent Stress ◽  
Total Deformation ◽  
Trailing Edge ◽  
Housing Damage ◽  
The Difference ◽  
Gas Turbine Power Plant

To solve the housing damage problem of a fractured compressor blade (CB) caused by an impact on the inner casing of a gas turbine in the seventh stage (from 15 stages), modifications of the trailing edge (TE) of the CB have been proposed, namely 6.5 mm curved cutting and a combination of 4 mm straight cutting with 6.5 mm curved cutting. The simulation results of the modifications in both aerodynamics variables Cl and Cd and the pressure ratio, including structural dynamics such as a normalized power spectrum, frequency, total deformation, equivalent stress, and the safety factor, found that 6.5 mm curved cutting could deliver the aerodynamics and structural dynamics similar to the original CB. This result also overcomes the previous work that proposed 5.0 mm straight cutting. This work also indicates that the operation of a CB gives uneven pressure and temperature, which get higher in the TE area. The slightly modified CB can present the difference in the properties of both the aerodynamics and the structural dynamics. Therefore, any modifications of the TE should be investigated for both properties simultaneously. Finally, the results from this work can be very useful information for the modification of the CB in the housing damage problem of the other rotating types of machinery in a gas turbine power plant.

Study on Thermal Analysis of the Shape of Improved Electric Cooker Liner Based on ANSYS Workbench

2014 ◽  
Vol 487 ◽  
pp. 568-571
Author(s):  
Yan Li Su ◽  
Lei Li ◽  
Wei Guo Han
Keyword(s):  
Thermal Analysis ◽  
Thermal Stress ◽  
Stress Analysis ◽  
Thermal Effects ◽  
The Body ◽  
Total Deformation ◽  
Ansys Workbench

In this paper, a comparative thermal analysis is carried out according to the bottom of HR-FD51 electric cooker liner about a large or small fillet. And then the thermal analysis results are applied to stress analysis as the body loads. The results show that it can reduce thermal stress and total deformation with a large fillet, thereby, improves the lifespan of electric cooker liner and thermal effects as well.

Study of the Size Effects and Friction Conditions in Microextrusion—Part II: Size Effect in Dynamic Friction for Brass-Steel Pairs

2007 ◽  
Vol 129 (4) ◽  
pp. 677-689 ◽  
Author(s):  
Lapo F. Mori ◽  
Neil Krishnan ◽  
Jian Cao ◽  
Horacio D. Espinosa
Keyword(s):  
Grain Size ◽  
Friction Coefficient ◽  
Size Effect ◽  
Contact Pressure ◽  
Size Effects ◽  
Numerical Models ◽  
Kolsky Bar ◽  
Experimental Results ◽  
Material Response ◽  
Dynamic Coefficients

In this paper, the results of experiments conducted to investigate the friction coefficient existing at a brass-steel interface are presented. The research discussed here is the second of a two-part study on the size effects in friction conditions that exist during microextrusion. In the regime of dimensions of the order of a few hundred microns, these size effects tend to play a significant role in affecting the characteristics of microforming processes. Experimental results presented in the previous companion paper have already shown that the friction conditions obtained from comparisons of experimental results and numerical models show a size effect related to the overall dimensions of the extruded part, assuming material response is homogeneous. Another interesting observation was made when extrusion experiments were performed to produce submillimeter sized pins. It was noted that pins fabricated from large grain-size material (211μm) showed a tendency to curve, whereas those fabricated from billets having a small grain size (32μm), did not show this tendency. In order to further investigate these phenomena, it was necessary to segregate the individual influences of material response and interfacial behavior on the microextrusion process, and therefore, a series of frictional experiments was conducted using a stored-energy Kolsky bar. The advantage of the Kolsky bar method is that it provides a direct measurement of the existing interfacial conditions and does not depend on material deformation behavior like other methods to measure friction. The method also provides both static and dynamic coefficients of friction, and these values could prove relevant for microextrusion tests performed at high strain rates. Tests were conducted using brass samples of a small grain size (32μm) and a large grain size (211μm) at low contact pressure (22MPa) and high contact pressure (250MPa) to see whether there was any change in the friction conditions due to these parameters. Another parameter that was varied was the area of contact. Static and dynamic coefficients of friction are reported for all the cases. The main conclusion of these experiments was that the friction coefficient did not show any significant dependence on the material grain size, interface pressure, or area of contact.

Worm gear wear and coefficient of efficiency during their running-in period

2021 ◽  
pp. 22-25
Author(s):  
Keyword(s):  
Friction Coefficient ◽  
Velocity Vector ◽  
Worm Gear ◽  
Worm Gears ◽  
Contact Surfaces

The process of worm gear wear is considered. The reasons for the change in the coefficient of efficiency of worm gears during the running-in period are analyzed. Keywords: worm gear, line of engagement, contact surfaces, involute worm, velocity vector, friction coefficient. [email protected]

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