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Relevant bibliographies by topics / Pressure and Tension in the Contact Surface

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Academic literature on the topic 'Pressure and Tension in the Contact Surface'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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Journal articles on the topic "Pressure and Tension in the Contact Surface"

1

Dou, Yi Hua, Xing Wang, Yang Yu, and Xiang Tong Yang. "Analysis of Sealing Ability of Premium Tubing Connection under Axial Alternating Tension Load." Advanced Materials Research 634-638 (January 2013): 3569–72. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3569.

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In order to know the sealing ability under axial alternating tension load, a 88.9mm×6.45mm P110 premium tubing connection is established with multiple linear elastic plastic finite element model, stress and contact pressure on sealing surface and torque shoulder are analyzed under axial alternating tension load and 80 MPa inner pressure. The results show that tubing connection slide by the axial tension, while the maximum contact pressure on seal surface reduced. With the increasing of alternating cycle, the maximum equivalent stress on seal surface increased and the maximum contact pressure o

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Magnin, A., J. M. Piau, J. Frene, D. Bois, and M. Godet. "Hydrodynamics of Wire-Drum Contact." Journal of Tribology 109, no. 4 (1987): 679–83. http://dx.doi.org/10.1115/1.3261537.

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The hydrodynamics of a wire-drum contact is analyzed using theoretical techniques developed in foil bearing studies. Analytical solutions and numerical solutions are obtained. Results show that: when for a given minimum film thickness the wire tension increases, the pressure arc extent decreases and reaches a minimum for certain wire tension level; the pressure distribution is independent of wire tension for large values of tension; and the active pressure zone depends strongly on film thickness.

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Li, Shaoheng, Weike Yuan, Yue Ding, and Gangfeng Wang. "Indentation load–depth relation for an elastic layer with surface tension." Mathematics and Mechanics of Solids 24, no. 4 (2018): 1147–60. http://dx.doi.org/10.1177/1081286518774090.

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The load–depth relation is a fundamental requisite in nanoindentation tests for thin layers; however, the effects of surface tension are seldom included. This paper concerns micro-/nano-sized indentation by a rigid sphere of a bonded elastic layer. The surface Green’s function with the incorporation of surface tension is first derived by applying the Hankel integral transform, and subsequently used to formulate the governing integral equation for the axisymmetric contact problem. By using a numerical method based on the Gauss–Chebyshev quadrature formula, the singular integral equation is solv

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4

Priliepo, Nataliia. "Interactions of a Deformable Wheel with a Deformable Support Surface." International Journal of Innovative Technology and Exploring Engineering (IJITEE) 13, no. 9 (2024): 1–4. https://doi.org/10.35940/ijitee.I9944.13090824.

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<strong>Abstract:</strong> The article analyzes methods for solving problems on the drive systems' compacting effect on the support surface (soil). There are analyzed results of studies on the distribution of pressures and tensions in the contact surfaces depending on the propulsors' mechanical properties and the support surface's material. The article also includes an analysis of methods for formalizing contact surfaces and constructing mathematical models for determining the distribution of pressures, deformations, and tensions in the contact surfaces. Numerical methods for solving contact p

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Moriarty, J. A., and E. L. Terrill. "Mathematical modelling of the motion of hard contact lenses." European Journal of Applied Mathematics 7, no. 6 (1996): 575–94. http://dx.doi.org/10.1017/s0956792500002588.

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In this paper we examine the movement of hard contact lenses on the eye. In so doing, we take into account hydrodynamic forces underneath the lens, as well as surface tension forces at the lens periphery. This involves solving for the free surface of the tear film away from the lens in order to determine the magnitudes of the pressure and surface tension forces on the lens. The analysis, which assumes quasi-steady motion, is carried out in both two and three dimensions.

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Yu, Yang, Zhan Qu, Yinping Cao, Yihua Dou, and Juncheng Li. "Sealability Analyses of Premium Connections Characterized by a Surface Fractal Function." Applied Sciences 13, no. 11 (2023): 6467. http://dx.doi.org/10.3390/app13116467.

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With the development of high-pressure, high-temperature wells, the sealability of premium connections is being threatened by heavy loads. For the sake of researching the sealability of premium connections at the microlevel on the sealing surface, a rough profile was characterized according to a fractal function, and the influence of the fractal parameters of contact behavior on the rough surface was analyzed. A full-size premium connection model with a fractal surface FEM was established using ABAQUS software to analyze the Von Mises stress and contact pressure, and the sealability was then an

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Cui, Weihua, Weilin Gu, Hui Wang, and Chunlei Liu. "Research on Improvement of Clamping Device for Online Nondestructive Tensile Testing of Braided Wire Rope." Journal of Physics: Conference Series 2459, no. 1 (2023): 012043. http://dx.doi.org/10.1088/1742-6596/2459/1/012043.

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Abstract The online nondestructive tensile testing machine can crush wire ropes, during the safety tension test of braided wire ropes. To solve this problem, this paper analyzes the reasons for crushing phenomena from the aspects of static simulation and geometric analysis of wire ropes. In terms of static simulation of the tensile process, the equivalent stress, contact pressure and contact gap cloud map of the wire rope in the clamping jaw range are obtained. It is found that both equivalent stress and contact pressure of the wire rope reach maximum values at the transition section between t

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HADIDIMASOULEH, ROGHAYEH, MAZIAR SAHBA YAGHMAEE, REZA RIAHIFAR, and BABAK RAISSI. "MODELING OF THE SURFACE TENSION OF COLLOIDAL SUSPENSIONS." Surface Review and Letters 24, no. 04 (2016): 1750050. http://dx.doi.org/10.1142/s0218625x17500500.

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Surface tension is one of the fundamental properties of the colloids, which can be altered by concentration and size of colloidal particles. In the current work, modeling of the surface tension of suspension as it would be analyzed by maximum bubble pressure method has been performed. A new modified equation to correlate the surface tension with the bubble pressure is derived by applying fundamental thermodynamic relation considering the presence of particles in suspension and curvature of the interface between the particles and bubbles inside liquid. Moreover, the change of particles concentr

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Huang, Long Cang, Yin Ping Cao, Yang Yu, and Yi Hua Dou. "Analysis and Comparison of Seal Ability of Premium Tubing Connections under Axial Alternating Load." Applied Mechanics and Materials 423-426 (September 2013): 2035–39. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.2035.

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In the process of oil and gas well production, tubing connection stand the axial alternating load during open well, shut well and fluid flow. In order to know premium connection seal ability under the loading, two types of P110 88.9mmx6.45mm premium tubing connections which called A connection and B connection are performed with finite element analysis, in which contact pressures and their the regularities distribution on sealing surface are analyzed. The results show that with the increasing of cycle number, the maximum contact pressures on sealing surface of both A connection and B connectio

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Zhao, Yumeng, Boyoung Jeong, Dong-Hun Kang, and Sheng Dai. "Impacts of motile Escherichia coli on air-water surface tension." E3S Web of Conferences 205 (2020): 08003. http://dx.doi.org/10.1051/e3sconf/202020508003.

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Immiscible multiphase flow in porous media is largely affected by interfacial properties, manifested in contact angle and surface tension. The gas-liquid surface tension can be significantly altered by suspended particles at the interface. Particle-laden interfaces have unique properties, for example, a lower surface tension of interfaces laden with surfactants or nanoparticles. This study investigates the impacts of a motile bacterium Escherichia coli (E. coli, strain ATCC 9637) on the air-water surface tension. Methods of the maximum bubble pressure, the du Noüy ring, and the pendant droplet

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Dissertations / Theses on the topic "Pressure and Tension in the Contact Surface"

1

Rapolu, Prakash. "Capillarity Effect on Two-phase Flow Resistance in Microchannels." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1204082574.

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Yildirim, Ismail. "Surface Free Energy Characterization of Powders." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/27525.

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Microcalorimetric measurements and contact angle measurements were conducted to study the surface chemistry of powdered minerals. The contact angle measurements were conducted on both flat and powdered talc samples, and the results were used to determine the surface free energy components using Van Oss-Chaudhury-Good (OCG) equation. It was found that the surface hydrophobicity of talc increases with decreasing particle size. At the same time, both the Lifshitz-van der Waals (gSLW) and the Lewis acid-base (gSAB) components (and, hence, the total surface free energy (gS)) decrease with decrea

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Koran, Karen M. "Surface interactions of surface washing agents an examination of detergency, interfacial tension and contact angle /." Cincinnati, Ohio : University of Cincinnati, 2007. http://www.ohiolink.edu/etd/view.cgi?ucin1186105489.

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KORAN, KAREN M. "SURFACE INTERACTIONS OF SURFACE WASHING AGENTS: AN EXAMINATION OF DETERGENCY, INTERFACIAL TENSION AND CONTACT ANGLE." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186105489.

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Larson, Hans Christian. "Replacement Rates of Initially Hydrocarbon-Filled Microscopic Cavities with Water." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7496.

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Wetting behaviors influence many aspects of life and industry from consumer product goods to oil recovery to cosmetics. While the traditional solid-liquid-vapor (SLV) system has been studied for many years now, wetting transitions in the solid-liquid-liquid (SLL) system has remained relatively unexplored. The purpose of this work is to bring light to the wetting transition of the solid-liquid-liquid system and to understand the replacement rates of initially hydrocarbon-filled microscopic cavities with water and the factors affecting these rates. Factors studied were viscosity, density, diffus

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Adler, Jeanette. "Film Formation and Surface Tension Studies of Powder Coatings." Thesis, KTH, Fibre and Polymer Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3935.

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<p>In industrial use of paint systems a swift processing is crucial. Another very important issue is to improve the quality of the final coating. This report investigates the film formation process of powder coatings, specially the spreading of individual powder particles. The obtained results can be used to understand and control the film formation process. In this way the desired levelling can be achieved and thus the desired gloss or other surface characteristics that may be required. This means that the method could be used when evaluating different polymer and additive combinations that c

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Sun, Jinxia. "Characterization of Organosilicone Surfactants and Their Effects on Sulfonylurea Herbicide Activity." Diss., Virginia Tech, 1996. http://hdl.handle.net/10919/30343.

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This research focused on the characterization of organosilicone surfactants and their effects on sulfonylurea herbicide activity. The project included efficacy tests, rainfastness studies in the greenhouse, radiotracer studies on herbicide uptake, fluorescent dye studies on surface deposition, and various measurements of physico-chemical properties. In measuring physico-chemical properties, a logistic dose response relationship was found between adjuvant concentration and contact angle on parafilm. An AsymSigR relationship existed between adjuvant concentration and surface tension for all the

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Rashid, Asim. "MINIMIZING CONTACT STRESSES IN AN ELASTIC RING BY RESPONSE SURFACE OPTIMIZATION." Thesis, Högskolan i Jönköping, Tekniska Högskolan, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-13023.

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Kim, Seong Jin. "Fluid Dynamics in Liquid Entry and Exit." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/88757.

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Interaction between a solid body and a liquid-air interface plays an important role in multiphase flows, which includes numerous engineering applications such as mineral flotation, dip coating operations, and air-to-sea and sea-to-air projectiles. It is also crucial in animal behaviors like the locomotion of water-walking animals, the plunge-diving of birds, and the jumping out of water of marine creatures. Depending on the moving direction of a solid, such diverse phenomena can be classified into two categories; liquid-entry and liquid-exit. Liquid-entry, or more widely called water-entry, is

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Dugáček, Ján. "Automatizované optické měření kontaktního úhlu kapky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377330.

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Measurement of surface tension of solids usually requires manual processing of photographs of droplets of liquids with known properties on the measured material's surface, during which the contact angle is manually determined. The objective of this work is to implement an algorithm that can determine these contact angles from photographs and does not require the photographs to be made under specific light conditions. The implementation cannot depend on paid libraries and must be simple to incorporate into existing software.

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Books on the topic "Pressure and Tension in the Contact Surface"

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1933-, Neumann A. W., and Spelt Jan K. 1956-, eds. Applied surface thermodynamics. M. Dekker, 1996.

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2

F, Chao David, and NASA Glenn Research Center, eds. Flow visualization in evaporating liquid drops and measurement of dynamic contact angles and spreading rate. National Aeronautics and Space Administration, Glenn Research Center, 2001.

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3

Zhao, Hong, and Kock-Yee Law. Surface Wetting: Characterization, Contact Angle, and Fundamentals. Springer London, Limited, 2015.

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4

Zhao, Hong, and Kock-Yee Law. Surface Wetting: Characterization, Contact Angle, and Fundamentals. Springer, 2015.

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Zhao, Hong, and Kock-Yee Law. Surface Wetting: Characterization, Contact Angle, and Fundamentals. Springer International Publishing AG, 2016.

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6

David, Robert, Yi Zuo, and A. W. Neumann. Applied Surface Thermodynamics. Taylor & Francis Group, 2010.

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Neumann, A. W. Applied Surface Thermodynamics. Taylor & Francis Group, 2010.

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David, Robert, Yi Zuo, and A. W. Neumann. Applied Surface Thermodynamics. Taylor & Francis Group, 2010.

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Neumann, A. W., and Jan K. Spelt. Applied Surface Thermodynamics. Taylor & Francis Group, 1996.

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10

Contact angle and surface tension measurements of a five-ring polyphenyl ether. Lewis Research Center, 1985.

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Book chapters on the topic "Pressure and Tension in the Contact Surface"

1

Liggieri, L., E. Ricci, N. Rando, and A. Passerone. "Interfacial Tension and Contact Angle in Immiscible Systems by Capillary Pressure Measurements." In Surfaces and Interfaces of Ceramic Materials. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1035-5_27.

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Han, Yue, Yaohui Gao, Hao Cui, Ning Liu, and Pingzhi Chen. "Research on the Design Method of Ultimate Pressure for Compressed Air Energy Storage in Hydroelectric Tunnels." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-9184-2_44.

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AbstractThe design of storage pressure is an indispensable step for reusing the existing hydropower tunnels into compressed air storage cavern, which directly affects the safety and economy of the plant. To design appropriate pressure, firstly the three anti lifting theoretical models are adopted to establish the analytical ultimate pressure methods in this paper and the ultimate pressure obtained under different parameters are compraed and anyasided. Based on multi-layer thick-walled cylinder theory, an improved calculation method for the ultimate pressure is proposed. Then parameter sensitiv

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Law, Kock-Yee, and Hong Zhao. "Determination of Solid Surface Tension by Contact Angle." In Surface Wetting. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25214-8_7.

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Mohseni, Kamran. "Surface Tension, Capillarity, and Contact Angle." In Encyclopedia of Microfluidics and Nanofluidics. Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_1507.

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Mohseni, Kamran. "Surface Tension, Capillarity, and Contact Angle." In Encyclopedia of Microfluidics and Nanofluidics. Springer US, 2014. http://dx.doi.org/10.1007/978-3-642-27758-0_1507-2.

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Hellmuth, Rudolf A. P., and Raul G. Lima. "Contact Finite Element with Surface Tension Adhesion." In Technologies for Medical Sciences. Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4068-6_2.

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O’Brien, S. B. G. M. "Small drops, surface tension and contact angle." In European Consortium for Mathematics in Industry. Vieweg+Teubner Verlag, 1992. http://dx.doi.org/10.1007/978-3-663-09834-8_45.

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Popov, Valentin L. "Adhesion of a Thin Soft Matter Layer: The Role of Surface Tension." In Springer Tracts in Mechanical Engineering. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_19.

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AbstractWe consider an adhesive contact between a thin soft layer on a rigid substrate and a rigid cylindrical indenter (“line contact”) taking the surface tension of the layer into account. First, it is shown that the boundary condition for the surface outside the contact area is given by the constant contact angle—as in the case of fluids in contact with solid surfaces. In the approximation of thin layer and under usual assumptions of small indentation and small inclination angles of the surface, the problem is solved analytically. In the case of a non-adhesive contact, surface tension makes

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Fujikawa, Shigeo, Takeru Yano, and Masao Watanabe. "Vapor Pressure, Surface Tension, and Evaporation Coefficient for Nanodroplets." In Heat and Mass Transfer. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-18038-5_4.

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Moules, C. A. "Surface effects including interfacial tension, wettability, contact angles and dispersibility." In Physico-Chemical Aspects of Food Processing. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4613-1227-7_8.

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Conference papers on the topic "Pressure and Tension in the Contact Surface"

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Hassanin, Ahmed, Peter Yancey, Chris Alexander, Glenn Astolfi, Jeffrey Piascik, and Jeff Pavelka. "Surface and Defect Preparation Using Atmospheric Plasma for Non-Metallic Pipe Repair." In CONFERENCE 2022. AMPP, 2022. https://doi.org/10.5006/c2022-18175.

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ABSTRACT Atmospheric Plasma Solutions Inc. (APS) partnered with ADV Integrity, Inc. to conduct a testing program to evaluate the impact of atmospheric plasma surface preparation on the performance of composite systems used to repair defects in transmission pipelines. The APS surface treatment system provides a portable solution for coating removal and functionalizes surfaces to increase adhesion of resins/epoxy/coatings to the underlying substrate. Composite repair systems’ performance relies heavily on the levels of adhesion between the initial layer of the composite system and the substrate.

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van Zyl, Gys. "Determination of Target Bolt Tension for Flanges With Lens Gaskets." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65439.

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A lens gasket is a specific type of metallic ring gasket that is usually only deployed in high pressure gas applications where a high integrity bolted flange joint is required. Lens gaskets are not common in ASME design and there are no ASME rules that guide the design of flanges with lens gaskets, nor are there ASME standards to control lens gasket specifications. Lens gaskets present a special challenge when determining target bolt tension values for flange assembly. For calculating target bolt tension, the gasket seating width is an important parameter. With lens gaskets, the gasket seating

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Ward, C. A. "Dependence of the Contact Angle on Adsorption at the Solid-Liquid Interface." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30180.

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A method for determining the surface tension of solid-fluid interfaces has been proposed. For a given temperature and fluid-solid combination, these surface tensions are expressed in terms of material properties that can be determined by measuring the amount of vapor adsorbed on the solid surface as a function of xV, the ratio of the vapor-phase pressure to the saturation-vapor pressure. The thermodynamic concept of pressure is shown to be in conflict with that of continuum mechanics, but is supported experimentally. This approach leads to the prediction that the contact angle, θ, can only exi

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Sharples, J. K., M. A. Wilkes, S. F. Yellowlees, et al. "Analysis of Multiple Co-Planar Surface Breaking Flaws Loaded in Tension Under Cleavage Failure Conditions." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93562.

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In procedures such as R6 and BS 7910 for assessing the structural integrity of structures, complex multiple flaws located in close proximity to each other are generally characterised as one, larger, single flaw. Recent studies have shown that the current characterisation rules may be non-conservative under some circumstances. Concurrent experimental and analytical programmes are being undertaken in order to further investigate this potential non-conservatism for situations where the possibility of cleavage failure has to be taken into account when assessing structures or components containing

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Mirnouri Langroudi, S. M., M. Ghasemi, A. Shahabi, and H. Rezaei Nejad. "Investigation of Bubble Nucleation on Platinum Solid Surface Using Molecular Dynamics (MD) Simulation." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25114.

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The main purpose of this paper is to numerically investigate the contact angle of a bubble on a solid surface and the effect of bubble curvature on the surface tension. A computer code based on Molecular Dynamics method is developed. The code carries out a series of simulations to generate bubbles between two planar solid surfaces for different wettabilities. In our simulation, the surface wettability affects the bubble contact angle and curvature. The pair potential for the liquid–liquid and liquid-solid interaction is considered using Lennard-Jones model. Density profiles are locally calcula

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Nassar, Sayed A., Ramanathan M. Ranganathan, Saravanan Ganeshmurthy, and Gary C. Barber. "Effect of Tightening Speed on the Torque-Tension and Wear Pattern in Bolted Connections." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93211.

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This experimental study investigates the effect of tightening speed and coating on both the torque – tension relationship and wear pattern in threaded fastener applications. The fastener torque – tension relationship is highly sensitive to normal variations in the coefficients of friction between threads and between the turning head and the surface of the joint. Hence, the initial level of the joint clamp load and the overall integrity and reliability of a bolted assembly is significantly influenced by the friction coefficients. The effect of repeated tightening and loosening is also investiga

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Zaki, Amro M., Sayed A. Nassar, Meyer Shillor, and Serge Kruk. "Inverse Solution for Bolt Preload Using Joint Surface Deformation." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97145.

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In this paper, an inverse bi-harmonic axisymmetric elasticity problem is solved by invoking measured out-of-plane surface deformation values at discrete locations around a preloaded bolt head, in order to calculate the under head contact stress and joint clamp load that would have caused that out-of-plane surface deformation. Solution of this type of inverse problem promises to improve the automation process of bolted joint system assembly, especially in critical and safety related applications. For example, a real-time optically measured joint surface deformation can be utilized for automatin

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Shirakawa, Atsushi, Toshiyuki Sawa, and Tomohiro Naruse. "FEM Contact Stress Analysis at the Bearing Surfaces in Bolted Joints Under External Loadings." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84086.

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The higher bolt preload is better for increasing the integrity of bolted joints. However, the bearing surface could be permanently deformed with too much high preload and the bolt preload decreases with permanent deformation. Thus, an upper limit of bolt preload per contact area at the bearing surfaces, which is called as the critical contact stress, must be examined for various materials of clamped parts. In the previous research, the critical contact stresses were obtained by compressing a cylindrical bar. However, the contact stress distribution of compressing a cylindrical bar is much diff

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Nassar, Sayed A., Marco Gerini Romagnoli, and Joon Ha Lee. "Bearing Friction Torque in Threaded Fasteners With Non-Flat Underhead Contact." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84015.

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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 testi

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Davies, C. M., P. Sandmann, T. Ronneberg, P. A. Hooper, and Saurabh Kabra. "Residual Stress Measurements in a 316L Uniaxial Samples Manufactured by Laser Powder Bed Fusion." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21704.

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Abstract Uniaxial samples have been manufactured for tension/compression testing from 316L stainless steel by laser powder bed fusion (LPBF). Samples manufactured by LPBF are known to contain high levels of residual stresses. These uniaxial samples were built from a solid cylindrical rod and subsequently machined to reduce the central cross section of the sample to the required gauge diameter and improve the surface finish. Finite element (FE) models have been developed to simulate the LPBF process of the rods, their removal from the build plate and subsequent machining into the tension/compre

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Reports on the topic "Pressure and Tension in the Contact Surface"

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Warrick, Arthur, Uri Shani, Dani Or, and Muluneh Yitayew. In situ Evaluation of Unsaturated Hydraulic Properties Using Subsurface Points. United States Department of Agriculture, 1999. http://dx.doi.org/10.32747/1999.7570566.bard.

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The primary information for accurately predicting water and solute movement and their impact on water quality is the characterization of soil hydraulic properties. This project was designed to develop methods for rapid and reliable estimates of unsaturated hydraulic properties of the soil. Particularly, in situ methodology is put forth, based on subsurface point sources. Devices were designed to allow introduction of water in subsurface settings at constant negative heads. The ability to operate at a negative head allows a direct method of finding unsaturated soil properties and a mechanism fo

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Wu, Qihau, Kathryn Kremer, Stephen Gibbons, and Alan Kennedy. Determination of contact angle and surface tension of nanomaterial solutions by optical contact angle system. Engineer Research and Development Center (U.S.), 2019. http://dx.doi.org/10.21079/11681/33395.

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Wilkowski, Gery, and Ken Bagnoli. PR-276-223814-R02 Pragmatic Application of MegaRule RIN 1-192.712 Toughness Values L2 and L3 Procedures. Pipeline Research Council International, Inc. (PRCI), 2024. http://dx.doi.org/10.55274/r0000081.

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This project addresses pragmatic application of the new DOT/PHMSA MegaRule RIN 1 - 192.712 for recommended toughness values for determining if an ILI detected axial flaw needs repair or can instead be observed for any future growth. The MegaRule toughness is expressed as the Charpy energy value, which came from Charpy test data at 50�F. However, the fracture toughness of a surface-cracked pipe is quite different than Charpy impact toughness values, especially if the Charpy data is in the brittle-to-ductile transition region. The surface-cracked pipe burst-pressure transition temperature can be

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Lever, James, Emily Asenath-Smith, Susan Taylor, and Austin Lines. Assessing the mechanisms thought to govern ice and snow friction and their interplay with substrate brittle behavior. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/1168142742.

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Sliding friction on ice and snow is characteristically low at temperatures common on Earth’s surface. This slipperiness underlies efficient sleds, winter sports, and the need for specialized tires. Friction can also play micro-mechanical role affecting ice compressive and crushing strengths. Researchers have proposed several mechanisms thought to govern ice and snow friction, but directly validating the underlying mechanics has been difficult. This may be changing, as instruments capable of micro-scale measurements and imaging are now being brought to bear on friction studies. Nevertheless, gi

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Choudhary, Siddhant, Ross Underhill, and Thomas Krause. PR652-203801-R05 The Lab study Effect of Earth�s Field and Line Pressure on Magnetization of Pipeline. Pipeline Research Council International, Inc. (PRCI), 2024. http://dx.doi.org/10.55274/r0000073.

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Large standoff magnetometry is an emerging non-destructive magnetic test method, which is remote, passive, and non-contact. It is based on the inverse magnetostrictive effect and, therefore, has potential for detection of magnetic anomalies produced by elevated stresses in steel pipelines and ferromagnetic structures. Changes in the local pipeline stress state may arise due to corrosion, cracking, mechanical damage, ground movement (geohazards), or external loading. Laboratory measurements were performed on macroscopic steel samples in the elastic stress regime to investigate the potential for

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Lever, James, Austin Lines, Susan Taylor, Garrett Hoch, Emily Asenath-Smith, and Devinder Sodhi. Revisiting mechanics of ice–skate friction : from experiments at a skating rink to a unified hypothesis. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42642.

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The mechanics underlying ice–skate friction remain uncertain despite over a century of study. In the 1930s, the theory of self-lubrication from frictional heat supplanted an earlier hypothesis that pressure melting governed skate friction. More recently, researchers have suggested that a layer of abraded wear particles or the presence of quasi-liquid molecular layers on the surface of ice could account for its slipperiness. Here, we assess the dominant hypotheses proposed to govern ice– skate friction and describe experiments conducted in an indoor skating rink aimed to provide observations to

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Palkovic, Steven, Yasamin Salamat, Brendon Willey, and Simon Bellemare. PR-610-183867-R01 Fracture Toughness via In-ditch Non-destructive Testing - Validation. Pipeline Research Council International, Inc. (PRCI), 2020. http://dx.doi.org/10.55274/r0011802.

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A challenge for many pipeline operators is missing or incomplete records for sections of their transmission pipeline networks, especially regarding fracture toughness properties. These toughness values are necessary for performing fitness for service calculations and engineering critical assessment. New regulations for gas transmission pipelines stipulate conservative default values for applicable assets when traceable, verifiable, and complete (TVC) records are not available. The new rules allow for the use of nondestructive techniques within material verification programs to measure the actu

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Galili, Naftali, Roger P. Rohrbach, Itzhak Shmulevich, Yoram Fuchs, and Giora Zauberman. Non-Destructive Quality Sensing of High-Value Agricultural Commodities Through Response Analysis. United States Department of Agriculture, 1994. http://dx.doi.org/10.32747/1994.7570549.bard.

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The objectives of this project were to develop nondestructive methods for detection of internal properties and firmness of fruits and vegetables. One method was based on a soft piezoelectric film transducer developed in the Technion, for analysis of fruit response to low-energy excitation. The second method was a dot-matrix piezoelectric transducer of North Carolina State University, developed for contact-pressure analysis of fruit during impact. Two research teams, one in Israel and the other in North Carolina, coordinated their research effort according to the specific objectives of the proj

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Alchanatis, Victor, Stephen W. Searcy, Moshe Meron, W. Lee, G. Y. Li, and A. Ben Porath. Prediction of Nitrogen Stress Using Reflectance Techniques. United States Department of Agriculture, 2001. http://dx.doi.org/10.32747/2001.7580664.bard.

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Commercial agriculture has come under increasing pressure to reduce nitrogen fertilizer inputs in order to minimize potential nonpoint source pollution of ground and surface waters. This has resulted in increased interest in site specific fertilizer management. One way to solve pollution problems would be to determine crop nutrient needs in real time, using remote detection, and regulating fertilizer dispensed by an applicator. By detecting actual plant needs, only the additional nitrogen necessary to optimize production would be supplied. This research aimed to develop techniques for real tim

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STABILITY PERFORMANCE AND WIND TUNNEL TEST OF STEEL HYPERBOLIC COOLING TOWER CONSIDERING SKINNED EFFECT. The Hong Kong Institute of Steel Construction, 2023. http://dx.doi.org/10.18057/ijasc.2023.19.3.10.

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With the development of industry, cooling towers play a very important role in thermal power generation, and steel cooling towers are being used more widely. The surface of cooling towers is covered with profiled panels, and the skinned effect on the mechanical performance and stability of the structure should be considered. At present, most studies on steel cooling towers have not considered the skinned effect. In steel cooling towers, the skin panels are usually connected to members by self-tapping screws., the shearing test of self-tapping screw connection is carried out considering differe

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