Bibliografías temáticas / Friction joint

Literatura académica sobre el tema "Friction joint"

Autor: Grafiati
Publicado: 14 de marzo de 2023

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Artículos de revistas sobre el tema "Friction joint"

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Tanaka, E., N. Kawai, M. Tanaka, M. Todoh, T. van Eijden, K. Hanaoka, D. A. Dalla-Bona, T. Takata y K. Tanne. "The Frictional Coefficient of the Temporomandibular Joint and Its Dependency on the Magnitude and Duration of Joint Loading". Journal of Dental Research 83, n.º 5 (mayo de 2004): 404–7. http://dx.doi.org/10.1177/154405910408300510.

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In synovial joints, friction between articular surfaces leads to shear stress within the cartilaginous tissue, which might result in tissue rupture and failure. Joint friction depends on synovial lubrication of the articular surfaces, which can be altered due to compressive loading. Therefore, we hypothesized that the frictional coefficient of the temporomandibular joint (TMJ) is affected by the magnitude and duration of loading. We tested this by measuring the frictional coefficient in 20 intact porcine TMJs using a pendulum-type friction tester. The mean frictional coefficient was 0.0145 (SD 0.0027) after a constant loading of 50 N during 5 sec. The frictional coefficient increased with the length of the preceding loading duration and exceeded 0.0220 (SD 0.0014) after 1 hr. Application of larger loading (80 N) resulted in significantly larger frictional coefficients. In conclusion, the frictional coefficient in the TMJ was proportional to the magnitude and duration of joint loading.
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2

Senthilkumar, M., Lavish Kumar Singh, S. Lakshmanan, A. M. Shanawaz y M. Selwin. "Study of the Effect on Friction Welded Surface on Copper Aluminium Juncture". Key Engineering Materials 935 (30 de noviembre de 2022): 93–98. http://dx.doi.org/10.4028/p-48f907.

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The economical and highly productive method of welding is used to join a dissimilar material. The quality of welded joint with high efficiency is obtained from friction welding process. The intention of the current work is to assess the progress of solid state juncture of dissimilar materials of aluminum 6082 and copper. The strong joints were developed using frictional heat and external pressure. The friction welded joints were tested under welding strength and surface analysis using scanning force microscopy (SFM). Rotational speed, friction pressure and forging pressure were used to evaluate the performance of the welded joints. Optimize the welding strength and hardness was attained through taguchi method.
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Brodny, Jarosław. "ANALYSIS OF OPERATION OF ARCH FRICTIONAL JOINT LOADED WITH THE IMPACT OF FREELY FALLING MASS". Studia Geotechnica et Mechanica 35, n.º 1 (1 de marzo de 2013): 59–71. http://dx.doi.org/10.2478/sgem-2013-0005.

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Abstract Yielding support, commonly applied to secure dog headings, is made of carrying elements in the form of steel frames and friction props. Yielding capacity of this support is realized in frictional joints, which due to their geometry can be divided to straight and arch joints. Occurring in steel frames arch frictional joints are characterized with more complex loading state than straight joints used in friction props. In the article, there is presented an analysis of the state of stress and deformation of the arch frictional joint, which was carried out on the model of these joints using finite element method. The scope of the analysis included two methods of loading of arch frictional joint, namely its axial compression and bending. In both cases, joints were loaded dynamically with the impact of freely falling mass. Arch joints with and without passive pressure were submitted to an axial compression. Physical model of the frictional joint was developed on the basis of a system applied during the stand tests. To solve mathematical model an explicit integration method was used. As a result of analyses carried out, temporal courses of force transmitted through the frictional joint, and displacements of section sliding down were determined. On the basis of the temporal courses, dependences between maximum value of force transmitted through the frictional joint and the height from which the impact mass falls down were determined. Distributions of reduced stresses in elements of frictional joint were also determined and the state of deformation was described. In order to emphasize the difference between straight and arch frictional joints, also an analysis of internal forces in arch frictional joint depending on its geometrical parameters without and with passive pressure was presented.
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4

Han, Qingkai, Xueyan Zhao, Xingxiu Li y Bangchun Wen. "Bifurcations of a Controlled Two-Bar Linkage Motion with Considering Viscous Frictions". Shock and Vibration 18, n.º 1-2 (2011): 365–75. http://dx.doi.org/10.1155/2011/284103.

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In this paper, we investigate the joint viscous friction effects on the motions of a two-bar linkage under controlling of OPCL. The dynamical model of the two-bar linkage with an OPCL controller is firstly set up with considering the two joints' viscous frictions. Thereafter, the motion bifurcations of the two-bar linkage along the values of joint viscous frictions are obtained using shooting method. Then, single-periodic, multiple-periodic, quasi-periodic and chaotic motions of link rotating angles are simulated with given different viscous friction values, and they are illustrated in time domain waveforms, phase space portraits, amplitude spectra and Poincare mapping graphs, respectively. Additionally, for the chaotic case, Lyapunov exponents and hypothesis possibilities of the two joint motions are also estimated.
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Plainfossé, M., P. V. Hatton, A. Crawford, Z. M. Jin y J. Fisher. "Influence of the extracellular matrix on the frictional properties of tissue-engineered cartilage". Biochemical Society Transactions 35, n.º 4 (20 de julio de 2007): 677–79. http://dx.doi.org/10.1042/bst0350677.

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Low-friction surfaces are critical for efficient joint articulation. The tribological properties of articular cartilage have been studied extensively in native tissue and joints. Despite their importance, very few studies have examined the frictional properties of tissue-engineered cartilage. We have therefore reviewed the relationship between composition, structure and friction in tissue-engineered cartilage.
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6

KIMURA, Masaaki, Kenji SEO, Masahiro KUSAKA y Akiyoshi FUJI. "Relationship between friction time and joint strength of friction welding joints". Proceedings of Conference of Kansai Branch 2002.77 (2002): _9–57_—_9–58_. http://dx.doi.org/10.1299/jsmekansai.2002.77._9-57_.

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Lacki, P., W. Więckowski y P. Wieczorek. "Assessment Of Joints Using Friction Stir Welding And Refill Friction Stir Spot Welding Methods". Archives of Metallurgy and Materials 60, n.º 3 (1 de septiembre de 2015): 2297–306. http://dx.doi.org/10.1515/amm-2015-0377.

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Abstract FSW (Friction Stir Welding) and RFSSW (Refill Friction Stir Spot Welding) joints have been increasingly used in industrial practice. They successfully replace fusion-welded, riveted or resistance-welded joints. In the last two decades, dynamic development of this method has stimulated investigations of the fast methods for joint diagnostics. These methods should be non-destructive and easy to be used in technological processes. The methods of assessment of joint quality are expected to detect discontinuities in the structures welded using FSW and FSSW methods. Reliable detection of flaws would substantially extend the range of applications of FSW joints across many sectors of industry, including aviation. The investigations carried out in this paper allowed for characterization of defects present in FSW and RFSSW joints. Causes of these defects were also stressed. An overview of the methodologies for assessment of joint quality was presented. Results of assessment of the quality of joints made of 2024T6 aluminium sheet metal using FSW and RFSSW method were presented.
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8

Yan, Xueyuan, Shen Shi, Xuhong Liu y Huimin Mao. "Numerical Analysis of Mechanical Behavior of Self-Centering Joint between CFDST Column and RC Beam". Buildings 13, n.º 1 (4 de enero de 2023): 135. http://dx.doi.org/10.3390/buildings13010135.

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The existing connection between the concrete-filled double steel tubular (CFDST) column and the reinforced concrete (RC) beam is difficult to repair and reuse after damage. In this paper, a self-centering joint between the CFDST column and the RC beam is proposed. The self-centering of the joint is realized by prestressed steel strands, and the energy dissipation is realized by friction. The overall purpose of the research is to analyze the influence of steel strand and friction on the mechanical behavior of the joint. By comparing the envelope curve and the restoring force model of a numerical joint model with theoretical values, accuracy of the numerical model was verified. Then, joints with different parameters, including the friction, prestress of steel strands, and ratio of the resisting moment provided by steel strands to the resisting moment provided by friction in the opening moment of joints, were numerically analyzed. The results showed that the joints with greater friction and prestress of steel strands had higher bearing capacity. Increasing the friction could increase the energy dissipation capacity of the joint, but it would increase the residual deformation of the joint. To reduce residual deformation, the prestress of steel strands should be increased. When the resultant force of the pretension of steel strands was greater than friction, the steel head could be kept pressed on the connecting block, making the stress changes of steel strands and the self-centering performance of the joint stable.
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9

Min, Gyeongjo, Daisuke Fukuda, Sewook Oh, Gyeonggyu Kim, Younghun Ko, Hongyuan Liu, Moonkyung Chung y Sangho Cho. "Three-Dimensional Combined Finite-Discrete Element Modeling of Shear Fracture Process in Direct Shearing of Rough Concrete–Rock Joints". Applied Sciences 10, n.º 22 (12 de noviembre de 2020): 8033. http://dx.doi.org/10.3390/app10228033.

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A three-dimensional combined finite-discrete element element method (FDEM), parallelized by a general-purpose graphic-processing-unit (GPGPU), was applied to identify the fracture process of rough concrete–rock joints under direct shearing. The development process of shear resistance under the complex interaction between the rough concrete–rock joint surfaces, i.e., asperity dilatation, sliding, and degradation, was numerically simulated in terms of various asperity roughness under constant normal confinement. It was found that joint roughness significantly affects the development of overall joint shear resistance. The main mechanism for the joint shear resistance was identified as asperity sliding in the case of smoother joint roughness and asperity degradation in the case of rougher joint asperity. Moreover, it was established that the bulk internal friction angle increased with asperity angle increments in the Mohr–Coulomb criterion, and these results follow Patton’s theoretical model. Finally, the friction coefficient in FDEM appears to be an important parameter for simulating the direct shear test because the friction coefficient affects the bulk shear strength as well as the bulk internal friction angle. In addition, the friction coefficient of the rock–concrete joints contributes to the variation of the internal friction angle at the smooth joint than the rough joint.
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10

Vagts, Steffen, Josef Schlattmann, Alexander Kovalev y Stanislav N. Gorb. "Structure and Frictional Properties of the Leg Joint of the Beetle Pachnoda marginata (Scarabaeidae, Cetoniinae) as an Inspiration for Technical Joints". Biomimetics 5, n.º 2 (20 de abril de 2020): 14. http://dx.doi.org/10.3390/biomimetics5020014.

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The efficient locomotion of insects is not only inspiring for control algorithms but also promises innovations for the reduction of friction in joints. After previous analysis of the leg kinematics and the topological characterization of the contacting joint surfaces in the beetle Pachnoda marginata, in the present paper, we report on the measurement of the coefficient of friction within the leg joints exhibiting an anisotropic frictional behavior in different sliding directions. In addition, the simulation of the mechanical behavior of a single microstructural element helped us to understand the interactions between the contact parts of this tribological system. These findings were partly transferred to a technical contact pair which is typical for such an application as joint connectors in the automotive field. This innovation helped to reduce the coefficient of friction under dry sliding conditions up to 17%.
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Tesis sobre el tema "Friction joint"

1

Zhang, Cheng. "Robotic 3D friction stir welding : T-butt joint". Thesis, Högskolan Väst, Avd för automationssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-8250.

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This Master Thesis was performed in terms of robotic three dimensional friction stir welding with T-butt joint. Friction stir welding (FSW) is a solid state welding method that achieves the weld temperature by friction of a rotating non-consumable tool with the workpiece. Science and technology fast developing requires for higher seam quality and more complex welding joint geometry like 3D welds. In order to acquire high productivity, capacity and flexibility with acceptable cost, robotic FSW solution have been proposed. Instead of the standard FSW machine, using a robot to perform complicated welds such as, three-dimensional. In this report, a solution for weld a 3D T-butt joint, which located in an aluminium cylinder with 1.5 mm thickness using a robot, was developed. Moreover, two new paths were investigated in order to avoid the use of two welds to perform this type of joint. The paths were tested on 2D and on 3D (with a 5050 curvature radius) geometries. Both paths had good results. What is more, the parameter developing methods of FSW process, which is composed of necessary parameter setting, positional compensation was introduced. Specially,the study demonstrates how complicate geometry can be welded using a robot. Also,it shows that TWT temperature control is able to acquire high quality 3D welds. In addition, an analysis of the 2D welding and 3D welding was performed, which exposed that, keeping exactly the same welding conditions, higher lateral forces on the tool were found during 3D welding. Basis on the special case in this paper, when the tool goes like "climbing" the sample, the suffering force of tool decreasing with increasing the height(Z position); nevertheless, when the tool goes like "downhill", the suffering force of tool decreasing with decreasing the height (Z position). What is more, in 2D weld, increasing the downforce (Fz) results increasing the lateral forces which can be Fx and/or Fy. Finally, the future works suggestions were presented in terms of (1) performing the new paths into a real cylinder, (2) performing tensile test on the paths and comparing it with conventional path which weld twice, (3) researching how the downforce (Fz) influence the Fx and Fy during welding of different 3D geometries, (4) how the cooling rate of backing bar influence the seam quality when it is use the same welding parameters and (5) the effect of performing welds in the same welding temperature achieved with different combination of the tool rotational speed and downforce on the material properties
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Arinez, Jorge Francisco. "Reduction of friction in polymeric composites for artificial joint prostheses". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37044.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
Includes bibliographical references (leaves 128-135).
Ultra-high molecular weight polyethylene has been used as a bearing material in artificial joints for more than thirty years. Despite this long period of use and the success which artificial implants have had, material failure and ultimately prosthetic failure still occurs as the result of mechanical wear of the bearing surface. Several wear mechanisms have been proposed as the main causes for failure; however, none is as dominant as the delamination wear of artificial knee prostheses. Delamination wear occurs mainly as the result of cyclic plastic deformation of the surface and subsurface layer which causes cracks to nucleate and propagate in the subsurface leading to the production of wear sheets. This research seeks a new alternative material to prevent the occurrence of delamination wear by the use of a fiber reinforced composite. The use of a fiber-reinforced composite having fibers oriented normal to the sliding direction is known to offer reduced plastic deformation resulting from the high stiffness of fibers and furthermore can inhibit crack nucleation and more importantly propagation since fibers are able to arrest the growth of cracks normal to the fiber axis. This new material has been called homo composite based on the fact that fiber and matrix are made from the same material, namely UHMWPE. This material has shown promising results in friction tests yielding coefficients of 0.05 in bovine lubricated sliding conditions. The optimization of material processing parameters with respect to friction and wear of the homocomposite is also presented.
by Jorge Francisco Arinez.
S.M.
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3

KANTURA, JOHN JOSEPH. "TEST RIG DESIGN AND EVALUATION: CHARACTERIZING NONLINEARITY OF FRICTION JOINT". University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1046378210.

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Blom, Arvid. "Speed dependent friction in bolt joints". Thesis, KTH, Maskinkonstruktion (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141687.

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Denna rapport undersöker hastighetsberoende friktionsbeteende i zinkpleterade 8.8 M12x1.75 skruvförband med en klämlängd på 82 mm och ett åtdragningsmoment på 120 Nm. Totalt 84 åtdragningar genomförs med nya skruvar, brickor och muttrar för varje åtdragning med utrustning tillhandahållen av Atlas Copco. All data importeras och analyseras i Matlab. Analysen visar att inom en standard avvikelse från medelvärdet kan klämkraften variera med så mycket som 90% beroende på var inom det 10-200 rpms hastighetsspannet skruven drogs åt. Vidare framgår även att restmomentet är mycket beroende av den hastighet som skruven drogs åt vid, med ett restmoment ~5 Nm över slutmomentet för 10 rpm och ~20 Nm över slutmomentet vid 200 rpm. En ursprunglig hypotes tas fram som antar att en utförlig modell av lastfördelningen i skruvensgänga och under skruvens skalle kan användas för att förutse skruvförbandets friktionsbeteende. Denna hypotes övergavs då mätresultat och analys visar att effekten av en förbättrad lastfördelningsmodell inte skulle märkas då spridningen i friktionen är för stor.
This report examines the speed dependency of frictional behavior in zinc plated 8.8 M12x1.75 bolt joints with an 82 mm clamping length at a tightening torque of 120 Nm. A total of 84 test tightenings have been performed with new bolts, nuts and washers for each tightening. The tests are performed using equipment supplied by Atlas Copco and all data is imported and analyzed in Matlab. It is found that within one standard deviation of the mean value the clamping force can vary as much as 90% depending on where in the 10-200 rpm speed range the bolt is tightened. Furthermore it is concluded that the residual torque is also highly speed dependent, registering at ~5 Nm above the final torque at 10 rpm and ~20 Nm above at 200 rpm. An initial hypothesis was developed regarding the pressure distribution in the thread and under the bolt head in the hopes that better understanding and modeling of this aspect could help predict frictional behavior in the bolt joint. This hypothesis was abandoned after it is concluded that the impact of an improved pressure model would be much too small to be noticeable due to the already large scatter in frictional coefficients.
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Schroeder, Matthew O. "Biotribology : articular cartilage friction, wear, and lubrication /". Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-12302008-063639/.

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Sage, R. M. "The mathematical modelling of ball-joints with friction". Thesis, University of Leicester, 1987. http://hdl.handle.net/2381/34822.

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At present the effects of friction are not included in three-dimensional mechanism simulation packages because of the difficulty of determining a friction model for joints such as the spherical joint where the frictional resistance to motion depends not only upon the coefficient of friction and the magnitude of the loading on the joint but also on the pressure distribution within the joint resulting from that loading. Thus the basis of this thesis has been the development of a mathematical model of the effects of friction in a spherical joint which could then be incorporated into a mechanisms simulation program. The model developed has shown that the main factors determining the magnitudes and directions of the frictional effects produced in a spherical joint, apart from the coefficient of friction and the magnitude of the loading, are the extent of the contact area between the ball and the socket and the magnitude of the angle between the axis of rotation of the joint and the direction of the applied load. Experimental results were obtained using apparatus that enabled the frictional moment produced on the socket of a joint to be measured while allowing the angle between the axis of rotation of the ball and the direction of the applied load to be varied between measurements. These results, obtained for a range of values of the coefficient of friction, confirm that this angle is a significant factor in the model and that the model usefully determines the frictional effects produced in a spherical joint.
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Kantura, III John J. "Test rig design and evaluation characterizing nonlinearity of a friction joint /". Cincinnati, Ohio : University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1046378210.

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Nykänen, Robin. "Simulation of Bolted Joint with Frictional Contacts". Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74490.

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An easy and reliable way to join two or more components is to use a bolted joint. When torque is applied on the bolt head, a clamp force is achieved. However about 90% of this torque will be used just to overcome the friction in the interfaces. To be able to fasten these in an ecient and precise manner the friction in the bolt threads and underhead area is important to understand. This is currently investigated at Atlas Copco by using a friction test rig, FTR, which measures the clamp force, the total torque and the shank torque. To evaluate the test rig and also to be able to evaluate dierent friction models, a parameterised simulation model of a bolted joint is built. This is a 3D-model of the joint containing a bolt, a nut and a test specimen. The stiness and frictional behaviour of the FTR is used in the model to get a good comparison between these two. Dierent contact formulations and settings are tested to achieve a good model. Also, mesh size, step size and material models are evaluated to see the eect of these. The results show a good correlation between the FTR data and the simulation model. For the total torque to clamp force ratio a dierence of about 1% is achieved. The average dierence in shank torque and underhead torque is at 3.1% and -1.6% respectively. The pressure distribution for this model is shown to be unevenly distributed along the threads. This is minimized by softening the contact, but this instead increases the error between the FTR data and the simulation model. For the evaluation of friction models that are based on the contact pressure this needs to be investigated further to nd a good compromise between the contact pressure and the frictional behaviour.
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Owellen, Michael C. "Biotribology: The Effect of Lubricant and Load on Articular Cartilage Wear and Friction". Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36872.

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This paper presents a biotribological study on cartilage wear and friction, using a system of cartilage-on-stainless steel. This study is a part of the ongoing biotribology research by Dr. Furey at the Virginia Polytechnic Institute and State University.

Two loads (65 N and 20 N) and three lubricants (saline reference, reference + hyaluronic acid, and bovine synovial fluid) were tested and evaluated using several analysis techniques. These techniques included wear analysis by hydroxyproline measurement, scanning electron microscopy (SEM), histologic sectioning and staining, numerical analysis of friction and specimen displacement data, and Fourier transform infrared (FTIR) analysis.

Biochemical wear analysis showed that, under high load, the saline reference generated the most wear, hyaluronic acid produced less wear, and bovine synovial fluid produced the least. Wear was sensitive to load with all three lubricants, but was not significantly affected by the lubricant under low load.

SEM photographs and histologic sections showed evidence of plowing and surface delamination, as well as another wear mechanism that produced wear markings perpendicular to the direction of sliding.

Opaque films remained on the polished stainless steel disks after saline and hyaluronic acid tests, but not after synovial fluid tests. FTIR analysis of these films, as well as fresh and worn cartilage, showed that the cartilage experienced chemical changes during sliding.
Master of Science

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JOHANNA, DOLK. "Rotary Joint Module for Lenses on Infrared Camera". Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192635.

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Detta arbete utfördes på vridledsmodulen för handhållna kameror från T-serien hos företaget FLIR. Vridledsmodulen används för att hålla uppe objektivet och reglerar vinkeln på detta i jämförelse med resten av kameran. FLIR hade tidigare ett flertal lösningar för olika kameramodeller och dessa hade individuella problem när det kom till kvalitet, toleranser och hållbarhet. De tidigare lösningarna skilde sig i vilka komponenter som används och vilket vridmoment som krävs från användaren vid bruk. Företaget sökte en ny lösning för vridledsmodulen; en lösning som var skalbar. Detta innebar att den nya modulen skulle kunna användas i flera kameramodeller med olika användarmoment och olika objektiv med varierande vikt. Användarmomentet skulle kvantifieras genom att utvärdera befintliga lösningar; de funna värdena skulle sedan användas för att finna en ny lösning. Dimensionerna på modulen skulle väljas med hänsyn till dimensionerna på de tidigare lösningarna och gränssnittet mot kamerahuset. I början av projektet utfördes en förstudie genom att titta på tidigare lösningar gjorda av FLIR för att formulera krav på produkten. De verktyg som användes för detta var MATLAB för beräkningar, SolidWorks för CAD och utrustning från verkstaden för att manuellt mäta momentet. För att börja formulera koncept gjordes en brainstorm där de första koncepten förklarades genom skisser, och senare med CAD gjorda i SolidWork. Dessa koncept beräknades på genom att använda MATLAB för att hitta rätt dimensioner och komponenter. Koncepten diskuterades genom att låta berörda parter ge feedback under planerade möten. En Pugh’s matris användes för att utvärdera koncepten emot varandra, för att välja slutkoncept. De slutgiltiga koncepten var av två olika modeller. Det ena kontrollerades genom dimensioner och stålkulor, styrda av kompressionsfjädrar, som klickade i spår i en ytterring. Det andra styrdes endast genom friktionen mellan två ytor som var i kontakt med varandra under lasten från kompressionsfjädrar, där det då inte fanns distinkta klicklägen. Avsikten var att dessa två koncept skulle ha samma moment och att de skulle vara skalbara på samma sätt; genom olika förspänning av fjädrarna i applikationen.
This work was done on the rotary joint module of handheld cameras in the T-series made by the company FLIR. The rotary joint module holds the lens and controls the angle in relation to the rest of the camera. FLIR’s current solutions for the rotary joint had various module solutions for different camera models and the solutions have individual problems in quality, tolerances and durability. The current solutions differ in which components that are used, in dimensions and what torque is required by the user. The company was looking for a new solution for the rotary joint module; a solution with scalability. This means that the new module were to fit in several camera models with different torques and with lenses of different weight. The torque needed by the user would be quantified by evaluating solutions used today, where these values would be applied when finding a new solution. The dimensions of the module would be in consideration to the dimensions of the earlier solutions and to the interface between the joint and the camera. In the beginning of the project a pre study was made by looking at the current solutions made by FLIR to form requirements. The tools used for this were MATLAB for calculations, SolidWorks for CAD drawings and workshop tools for manual measurements of the torque. To start forming concepts solving the problem a brainstorm was performed where the ideas were visualized using sketches, and later CAD drawings using SolidWorks. These concepts were calculated using MATLAB to find the right dimensions and components. The concepts were discussed using meetings with interested parties, to get feedback on the work and sort out the better concepts. A Pugh’s matrix was used to evaluate the concepts against each other. The final concepts were of two different models; one controlled by dimensions and steel balls, connected to compression springs, clicking into grooves, and the other controlled merely by the friction between two surfaces provided under load from compression springs, where there were no actual click positions. The intention was that these two would have the same torque and they were scalable in the same way; by pre-tensioning the springs in the application to give different loads.
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Más fuentes

Libros sobre el tema "Friction joint"

1

Joint Winter Runway Friction Measurement Program. Overview of the Joint Winter Runway Friction Measurement Program. [Montréal]: Transportation Development Centre, 2004.

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2

ASME/STLE Tribology Conference (2004 Long Beach, Calif.). Proceedings of the ASME/STLE International Joint Tribology Conference : presented at 2004 ASME/STLE International Joint Tribology Conference : October 24-27, 2004, Long Beach, California, USA. New York, N.Y: ASME, 2004.

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A, Vogler William, Baldasare Paul y Langley Research Center, eds. Summary report on aircraft and ground vehicle friction correlation test results obtained under winter runway conditions during joint FAA/NASA runway friction programf. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1988.

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1956-, Jacobs Joshua J., Craig Thomas L. 1947- y Symposium on Alternative Bearing Surfaces in Total Joint Replacement (1997 : San Diego, Calif.), eds. Alternative bearing surfaces in total joint replacement. West Conshohocken, PA: ASTM [American Society for Testing and Materials], 1998.

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G, Adams George y American Society of Mechanical Engineers. Tribology Division., eds. Contact mechanics--friction: Modeling and experiment : presented at 2003 STLE/ASME Joint International Tribology Conference : October 26-29, 2003, Ponte Vedra Beach, Florida. New York, N.Y: American Society of Mechanical Engineers, 2003.

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United States. National Aeronautics and Space Administration., ed. An overview of the Joint FAA/NASA Aircraft/Ground Vehicle Runway Friction Program. [Washington, DC: National Aeronautics and Space Administration, 1989.

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United States. National Aeronautics and Space Administration., ed. NASA Boeing 737 aircraft test results from 1996 joint winter runway friction measurement program. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Popp, Karl. Detection, utilization, and avoidance of nonlinear dynamical effects in engineering applications: Final report of a joint research project sponsored by the German Federal Ministry of Education and Research. Aachen: Shaker, 2001.

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Yager, Thomas J. Evaluation of two transport aircraft and several ground test vehicle friction measurements obtained for various runway surface types and conditions: a summary of test results from Joint FAA/NASA Runway Friction Program. Hampton, Va: Langley Research Center, 1990.

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K, Kokula Krishna Hari, ed. Investigations of Analysis and Fabrication of butt joint using friction stir welding of A319 Aluminum Alloy: ICIEMS 2014. India: Association of Scientists, Developers and Faculties, 2014.

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Capítulos de libros sobre el tema "Friction joint"

1

Brockett, Claire, Sophie Williams, Zhong Min Jin y John Fisher. "Friction in Joint Replacements". En Encyclopedia of Tribology, 1325–30. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_190.

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Akamatsu, Noriya. "Friction and Wear of Artificial Joints: A Historical Review". En Joint Arthroplasty, 3–9. Tokyo: Springer Japan, 1999. http://dx.doi.org/10.1007/978-4-431-68529-6_1.

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Ikeuchi, Ken, Kazuto Takashima, Minako Ohashi y Jun Kusaka. "Friction and Wear Tests of Ceramics for All-Ceramic Artificial Joints". En Joint Arthroplasty, 132–39. Tokyo: Springer Japan, 1999. http://dx.doi.org/10.1007/978-4-431-68529-6_13.

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Ueno, Masaru, Hirokazu Amino, Hideaki Okimatu y Hironobu Oonishi. "Wear, Friction, and Mechanical Investigation and Development of Alumina-to-Alumina Combination Total Hip Joint". En Joint Arthroplasty, 119–31. Tokyo: Springer Japan, 1999. http://dx.doi.org/10.1007/978-4-431-68529-6_12.

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Fujii, Hidetoshi, Hideaki Kato, Kazuhiro Nakata y Kiyoshi Nogi. "Mechanical Properties of Friction-Stir Welded Titanium Joint". En Ceramic Transactions Series, 51–56. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144145.ch9.

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Lazennec, J. Y. "Analysis of Serum Cobalt levels and kinetics in 282 Patients with a Metal-Metal Friction Hip Prosthesis". En Bioceramics in Joint Arthroplasty, 79–80. Heidelberg: Steinkopff, 2003. http://dx.doi.org/10.1007/978-3-642-85763-8_9.

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Coelho, Humberto Tronconi, Francisco Paulo Lépore Neto y Marcelo Braga dos Santos. "Tunable Auxiliary Mass Damper with Friction Joint: Numerical Assessment". En Lecture Notes in Mechanical Engineering, 49–64. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91217-2_4.

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Jiang, Muyang, Ke Chen, Binxi Chen, Min Wang, Lanting Zhang y Aidang Shan. "Improving Porous TC4/UHMWPE Friction Spot Welding Joint Through Controlling Welding Temperature and Force". En Friction Stir Welding and Processing X, 255–65. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05752-7_25.

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Jana, S., Y. Hovanski, G. J. Grant y K. Mattlin. "Effect of Tool Feature on the Joint Strength of Dissimilar Friction Stir Lap Welds". En Friction Stir Welding and Processing VI, 205–11. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062302.ch25.

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Miles, M. P., U. Karki, T. Lee y Y. Hovanski. "Prediction of Joint Line Movement and Temperatures in Friction Stir Spot Welding of DP 980 Steel". En Friction Stir Welding and Processing VIII, 227–40. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093343.ch25.

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Actas de conferencias sobre el tema "Friction joint"

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Jiang, Yanyao, Ming Zhang, Tae-Won Park y Chu-Hwa Lee. "An Experimental Investigation on Frictional Properties of Bolted Joints". En ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1083.

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By using an approach developed to determining the torque-tension relationship for bolted joints, frictional properties of several typical bolted joints were studied experimentally. The approach allows for the direct determination of the thread friction and the bearing friction between the nut and its bearing surface independently. Detailed studies were made on the influences of the size and shape of the hole, the use of a slot in a bolted joint, contact area and position, and other factors such as turning speed, coating, and the use of wax on the bearing surface. The contact area and position of the washer have a marginal effect on the bearing friction. The organic coating on the nuts reduces the bearing friction significantly. Nuts with organic coating over a washer with zinc finish provide the smallest and the most consistent bearing friction. Experiments on thread friction shows that prevailing torque nuts with distorted threads and nylon inserts provided trivial benefits for preventing “self-loosening” of the nut. Repeated tightening-loosening generally increases frictions in a bolted joint. It was noted that the data scatter of the experimental results of frictions in a bolted joint may overshadow the influence of size, speed, and contact positions. The results from the experimental investigation will help to better design bolted joints.
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Gaul, L. y R. Nitsche. "Friction Control for Vibration Suppression". En ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8191.

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Abstract Friction damping in bolted joint connections of large space structures turned out to be a major source of damping (Gaul and Bohlen, 1987). For vibration suppression, the joints are designed such that the normal force in a frictional interface is controlled which improves damping performance. The use of active control to vary the normal contact force in a joint by means of a piezoelectric element is explored. A model consisting of two elastic beams connected by a single active joint is considered. A friction model with velocity dependent dynamics is used to describe the friction phenomena. A control law for friction dampers which maximizes energy dissipation instantaneously by controlling the normal force at the friction interface is proposed. The effect of displacement- and velocity-induced friction dynamics is considered for the design of the control law. We arrive at a dynamic controller which prevents frictional energy stored as potential energy in a bristle model from being returned to the system.
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Segalman, Daniel J. "Observations on Simulation of Joint Friction". En ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8188.

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Abstract Results of Ungar and of Goodman on dissipation rates in bolted joints are discussed. It is shown that an infinite network of discrete sliders and springs such as specified by Iwan in his study of “parallel-series” systems dissipates energy in a manner similar to that shown by Goodman for frictionally joined continua. The nonlinear nature of frictionally joined continua is further examined by computing the force-acceleration behavior of a single degree of freedom system with one slider, demonstrating interesting multiply closed curves.
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Huang, Jack Youqin. "Coefficients of Friction: Static Versus Dynamic". En 2020 Joint Rail Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/jrc2020-8025.

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Abstract This paper deals with the problem of static and dynamic (or kinetic) friction, namely the coefficients of friction for the two states. The coefficient of static friction is well known, and its theory and practice are commonly accepted by the academia and the industry. The coefficient of kinetic friction, however, has not fully been understood. The popular theory for the kinetic friction is that the coefficient of dynamic friction is smaller than the coefficient of static friction, by comparison of the forces applied in the two states. After studying the characteristics of the coefficient of friction, it is found that the comparison is not appropriate, because the inertial force was excluded. The new discovery in the paper is that coefficients of static friction and dynamic friction are identical. Wheel “locked” in wheel braking is further used to prove the conclusion. The key to cause confusions between the two coefficients of friction is the inertial force. In the measurement of the coefficient of static friction, the inertial force is initiated as soon as the testing object starts to move. Therefore, there are two forces acting against the movement of the object, the frictional force and the inertial force. But in the measurement of the coefficient of kinetic friction, no inertial force is involved because velocity must be kept constant.
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Amakawa, Hiroaki, Kenji Fukuzawa, Mitsuhiro Shikida, Hedong Zhang y Shitaro Itoh. "Quantification of Friction Force for Dual-Axis Probe Friction Force Microscope". En ASME/STLE 2009 International Joint Tribology Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/ijtc2009-15241.

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Conventional friction force microscopes (FFMs) had the disadvantage of low force sensitivity due to mechanical interference between torsion caused by friction force and deflection by normal force. In order to overcome disadvantage, we developed a dual-axis micro-mechanical probe, which measures the lateral force by the double cantilever and the vertical force by the torsion beam. However, the calibration method of the lateral force has not been established. In this study, we present a new calibration method using a step-structure.
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Ma, YunWu, YongBing Li y ZhongQin Lin. "Joint Formation and Mechanical Performance of Friction Self-Piercing Riveted Aluminum Alloy AA7075-T6 Joints". En ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2857.

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Abstract AA7xxx series aluminum alloys have great potentials in mass saving of vehicle bodies due to pretty high specific strength. However, the use of these high strength materials poses significant challenges to traditional self-piercing riveting (SPR) process. To address this issue, friction self-piercing riveting (F-SPR) was applied to join aluminum alloy AA7075-T6 sheets. F-SPR is realized by feeding a high speed rotating steel rivet to aluminum alloy sheets to form a dissimilar material joint. The effects of spindle speed and rivet feed rate on F-SPR joint cross-section geometry evolution, riveting force and energy input were investigated systematically. It was found that the rivet shank deformation, especially the buckling of the shank tip before penetrating through the top sheet has significant influence on geometry and lap-shear failure mode of the final joint. A medium rivet feed rate combined with a high spindle speed was prone to produce a defect free joint with sound mechanical interlocking. F-SPR joints with the failure mode of rivet shear fracture was observed to have superior lap-shear peak load and energy absorption over the joints with mechanical interlock failure. The optimized F-SPR joint in this study exhibited 67.6% and 13.9% greater lap-shear peak load compared to, respectively, SPR and refill friction stir spot welding joints of the same sheets. This research provides a valuable reference for further understanding the F-SPR process.
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Mourad, Abdel-Hamid I., Khalifa H. Harib y Aly El-Domiaty. "Fracture Behavior of Friction Stir Spot Welded Joint". En ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25986.

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The fracture behaviour of lap-shear joints manufactured by friction stir spot welding (FSSW) technique is examined in this paper. Two aluminium sheets of 2.8 mm thickness were welded using different process parameters to form a lap-shear joint. Special tool was designed and fabricated for the stir-spot welding process. Tensile-shear tests were performed to determine the tensile-shear load bearing capacity and toughness of the weld. The stress intensity factor and the J-integral around a weld are determined in order to characterize the fracture behavior. The effect of different main process controlling parameters, e.g., the tool prop pin rotating speed, duration action time and sinking/penetration depth into the lower welded sheet on the weld fracture behaviour has been investigated through an intensive experimental program. Optical and scanning electron microscopes fractographes were obtained to examine the weld fracture modes. The results show that higher frictional heat due to relatively higher tool probe pin rotational speed and penetration depth into the lower sheet produces improved joint static strength and toughness.
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Li, Jinjin, Chenhui Zhang y Jianbin Luo. "Friction Process of Superlubricity". En ASME/STLE 2012 International Joint Tribology Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ijtc2012-61048.

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The friction process of superlubricity (μ = 0.004) obtained by phosphoric acid solution has been investigated by a traditional tribometer. The evolution of friction coefficient with time indicates that the friction process of superlubricity is divided into three stages, i.e. friction reducing rapidly process, low friction process and superlubricity process. The feature of these three stages is discussed according to several experiments. The result indicates that the contact region in superlubricity state is a three layer structure formed after the first stage and the second stage, which is the origin of ultra-low friction.
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9

Tavares, S. M. O., P. C. M. Azevedo, B. Emi´lio, V. Richter-Trummer, M. A. V. Figueiredo, P. Vilac¸a y P. M. S. T. de Castro. "Friction Stir Welding of T-Joints in Dissimilar Aluminium Alloys". En ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67522.

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The T-joint is a common joint type frequently used in transport industries because of the importance of increasing the inertia and strength of thin skins and shells without significant weight increase. This shape can be obtained by different processes as extruding, riveting, welding or others. However, the low weldability of some aluminum alloys, when using traditional welding processes, is an obstacle to the possible full benefit of such reinforced structures. The friction stir welding (FSW) process is suitable to join most aluminum alloys and should be considered as a feasible alternative to the other processes used to produce this type of geometry. This paper reports the results obtained concerning FSW T-joints with a new configuration. These joints simulate a typical reinforcement composed by two materials in order to optimize the damage tolerance. The skin is made of a 6xxx series alloy, and the reinforcement is made of a 7xxx series alloy. Mechanical properties were obtained and micro-structural analyses of the weld zone were performed, and the results were compared with those obtained in base materials and butt joints.
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10

Imado, Keiji. "Study of Self-Locking Mechanism of Belt Friction". En ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44058.

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It is well know that the belt friction is expressed in an exponential function of a product μ and θ, the coefficient of friction and the angle of contact between the flexible belt and the cylindrical surface respectively. So the frictional force increases greatly with an increment of contact angle θ. Using this property, many kinds of buckles were developed to fasten belt. But the locking condition of belt is not obtained from the equation unless θ is of infinity. Their locking conditions were not clarified theoretically. In practice, the product of μθ is usually less than θ, so that the exponent of the product μθ is not so large. Then some slippage may occur in case of severe loading condition. This study is focusing on a self-locking mechanism of a simple buckle developed for flat belt. The belt in the buckle is partially wound again over the belt. According to the equation derived, the fraction of the tight side belt tension to the loose side belt tension is significantly affected by the angle of double-layered segment. With an increment of angle of doublelayered segment, the fraction increases to infinity, which means the occurrence of belt locking. The locking condition is determined by the geometry of the buckle and the coefficient of frictions. The frictional force is automatically generated by the tension of belt so that the self-locking mechanism is realized in the buckle. The equation derived was confirmed by the experiments.
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Informes sobre el tema "Friction joint"

1

Basehart, John R. Transformation of Special Operations: Reducing Joint Friction. Fort Belvoir, VA: Defense Technical Information Center, abril de 2003. http://dx.doi.org/10.21236/ada416585.

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Feliu, Vicente, Kuldip S. Rattan, Jr Brown y H. B. A New Approach to Control Single-Link Flexible Arms. Part 1. Modelling and Identification in the Presence of Joint Friction. Fort Belvoir, VA: Defense Technical Information Center, marzo de 1989. http://dx.doi.org/10.21236/ada210590.

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Hoelzer, David T., Caleb P. Massey, Christopher M. Fancher y Wei Tang. Complete Status Report Documenting the Development of Friction Stir Welding for Producing a Butt Joint in Thin Wall Tubing of ODS Alloys. Office of Scientific and Technical Information (OSTI), septiembre de 2018. http://dx.doi.org/10.2172/1492167.

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Feliu, Vicente, Kuldip S. Rattan, Jr Brown y H. B. A New Approach to Control Single-Link Flexible Arms. Part 2. Control of the Tip Position in the Presence of Joint Friction. Fort Belvoir, VA: Defense Technical Information Center, julio de 1989. http://dx.doi.org/10.21236/ada213365.

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Miller, Richard. A Preliminary Report on the Strength and Metallography of a Bimetallic Friction Stir Weld Joint Between AA6061 and MIL-DTL-46100E High Hardness Steel Armor. Fort Belvoir, VA: Defense Technical Information Center, noviembre de 2012. http://dx.doi.org/10.21236/ada580292.

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Guler, Bulent, Fatih Guvenen y Giovanni Violante. Joint-Search Theory: New Opportunities and New Frictions. Cambridge, MA: National Bureau of Economic Research, mayo de 2009. http://dx.doi.org/10.3386/w15011.

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HEINSTEIN, MARTIN W. y DANIEL J. SEGALMAN. Bending Effects in the Frictional Energy Dissipation in Lap Joints. Office of Scientific and Technical Information (OSTI), enero de 2002. http://dx.doi.org/10.2172/793221.

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Roesler, Jeffery, Roberto Montemayor, John DeSantis y Prakhar Gupta. Evaluation of Premature Cracking in Urban Concrete Pavement. Illinois Center for Transportation, enero de 2021. http://dx.doi.org/10.36501/0197-9191/21-001.

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This study investigated the causes for premature, transverse cracking on urban jointed plain concrete pavements in Illinois. A field survey of 67 sections throughout Illinois coupled with ultrasonic evaluation was completed to synthesize the extent of premature cracking on urban JPCP. The visual survey showed some transverse and longitudinal cracks were a result of improper slab geometry (excessive slab length and width). Ultrasonic tests over the contraction joints determined some notched joints had not activated and adjacent transverse cracks were likely formed as a result. Three-dimensional finite-element analyses confirmed that cracking would not develop as a result of normal environmental factors and slab-base frictional restraint. The concrete mixture also did not appear to be a contributing factor to the premature cracks. Finally, the lack of lubrication on dowel bars was determined to potentially be a primary mechanism that could restrain the transverse contraction joints, produce excessive tensile stresses in the slab, and cause premature transverse cracks to develop.
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ROTATIONAL RESISTANCE TEST OF A NEW ALUMINUM ALLOY PENETRATING (AAP) JOINT SYSTEM. The Hong Kong Institute of Steel Construction, junio de 2023. http://dx.doi.org/10.18057/ijasc.2023.19.2.4.

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Aluminum alloy penetrating (AAP) joint is an improved form of the Aluminum Alloy Temcor (AAT) joint system consisting of one penetrating member, four short members, gussets, bolts and a U-shaped connector. The rotational resistance performance of AAP joints is investigated by a static out-of-plane flexural test. The specific experimental parameters include the gusset thickness (6 mm and 12 mm) and shape (circular and X-shaped). The differences between penetrating and short members in AAP joints are analyzed, and the influence of thicknesses and shapes of gusset on rotational resistance behavior of the joints is analyzed. The establishment of the finite element model of the AAP joint system in this paper considers the effects of bolt pre-tightening force, installation gap and friction between contact surfaces. The M-Φ curves and damage patterns are obtained by numerical simulation. The detailed comparative analysis between AAP joint numerical simulation and test results verifies the accuracy of the numerical model.
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EFFECT OF RANDOM PRE-STRESSED FRICTION LOSS ON THE PERFORMANCE OF A SUSPEN-DOME STRUCTURE. The Hong Kong Institute of Steel Construction, marzo de 2022. http://dx.doi.org/10.18057/ijasc.2022.18.1.5.

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The key to the high-efficiency performance of the suspen-dome structure is to apply the pre-stressed design value to the structure accurately. However, engineering practice has found that the use of tensioning hoop cables to apply the pre-stress will produce noticeable pre-stressed friction loss (PFL), which significantly affects the safety performance of the structure. In this paper, based on a 1:10 scaled-down experiment model of a suspen-dome structure with rolling cable-strut joint installed, the random PFL (RPFL) effect of the suspen-dome on structure performance was analyzed through a probability statistics theory. First, aiming at the unequal tensioning force at both sides of the tensioned hoop cable during the tensioning process, a pre-stressed force calculation method is proposed that considers the unequal tensioning control force and RPFL at all cable–strut joints, and the reliability of this method is verified through a tension test. Then, based on the cable-joint tension test carried out in the early stage of the research group, a random mathematical model of the friction coefficient (FC) at the rolling cable–strut joint is established. And then, the cable force calculation method is used to establish the random finite element model, and independent and random changes in the FC at each rolling cable–strut joint can be considered. Subsequently, the Monte Carlo method is used to calculate the random mathematical characteristics of the mechanical performance parameters such as the member stress and joint deformation, and the obtained results are verified through a static loading experiment. In addition, to investigate the effect of random defects on structural stability, other random defects, such as the initial curvature and installation deviation, were continuously introduce based on the random finite element model. As such, we could obtain the law of the effect of multi-defect random variation coupling on the structure’s ultimate bearing capacity.
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