Academic literature on the topic 'Impact with friction'

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Journal articles on the topic "Impact with friction"

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Keller, J. B. "Impact With Friction." Journal of Applied Mechanics 53, no. 1 (1986): 1–4. http://dx.doi.org/10.1115/1.3171712.

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A theory of the impact or collision of two rigid bodies, taking account of friction, is presented. It determines how the direction of sliding varies during the impact, which must be known to calculate the direction of the frictional force and thence the frictional impulse. This is accomplished by analyzing the equations of motion of the bodies during the collision. The normal impulse is determined by using a coefficient of restitution. When the direction of sliding is constant throughout the collision, the theory agrees with that given by Whittaker, which is correct only in this case.
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Arya, V. S., B. Binu Aswathy, Pradeep Jyothi, Thomas Greena, A. Suminamol, and V. Aparna. "Impact of Side Friction on Urban Roads." Journal of Transportation Engineering and Traffic Management 1, no. 2 (2020): 1–9. https://doi.org/10.5281/zenodo.3953698.

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Urban roads in India operate under mixed traffic conditions. They are subjected to side friction factors such as slow-moving vehicles, interference of buses, pedestrian traffic, trading activities, frequent side roads, vehicles parked along the carriage way, entry and exit through approach road. But the side friction factors are not considered while designing roads as per IRC guidelines. Hence, the present work aims to determine the effect of side friction parameters on speed reduction. A road side friction index (RSFI) has been developed to quantify side frictions. Percentage speed reduction
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Huang, Ruoxi, Jiajing Li, and Jiatong Yu. "The Impact of China: U.S Trade Frictions on Chinese Enterprise Innovation." Academic Journal of Management and Social Sciences 9, no. 1 (2024): 25–32. http://dx.doi.org/10.54097/vhcrg319.

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The trade frictions between the United States and China has brought great uncertainty and risk to the global economic development environment. Using the panel data of Chinese listed firms from 2009 to 2023, the Difference in Difference (DID) panel model and mediation effect model are employed to study the impact of the US-China trade frictions on firms' innovation. The empirical results show that the US-China trade friction has a negative impact on R&D innovation of Chinese firms. Further research finds that US-China trade friction has a stronger negative effect on R&D innovation of no
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Tiwari, Ashish. "The Role of Friction in Athletic Performance: A Descriptive Analysis." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 04 (2024): 1–5. http://dx.doi.org/10.55041/ijsrem31958.

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Friction is a fundamental force that has a substantial impact on athletic performance across all sports disciplines. This descriptive research investigates the varied impact of friction in building athletic skill. This study looks at how friction affects running, jumping, throwing, and other sports activities by examining static and kinetic frictional forces, as well as elements that influence frictional interactions. The research examines the interaction of athletes, footwear, surfaces, and equipment to explain how friction governs propulsion, stability, and efficiency in sports activity. The
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ANDERSON, KEN, and MARIA CURY. "Friction into Traction: A Case Study of Frictions in Strategic Ethnography." Ethnographic Praxis in Industry Conference Proceedings 2023, no. 1 (2023): 346–68. https://doi.org/10.1111/epic.12173.

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This case study highlights the transformative power of strategic ethnography in shaping frameworks that gain traction within organizations, facilitated by three frictions: research friction, analysis friction, and path‐to‐action friction. By embracing frictions as productive movements, we not only witnessed the profound impact of ethnographic research on the future of a product category but also experienced the convergence of previously competing divisions, fostering innovation, collaboration, and organizational growth. Through an analysis of these frictions, we distill lessons for applied eth
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Sun, Wuxiang, Yanwei Liu, Xuan Li, Zhi Xu, Zhaojun Yang, and Hu Huang. "An Inertial Impact Piezoelectric Actuator Designed by the Asymmetric Friction Principle and Achieved by Laser Texturing of the Driving Feet." Actuators 11, no. 8 (2022): 211. http://dx.doi.org/10.3390/act11080211.

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An asymmetric friction principle is newly proposed for the design of inertial impact piezoelectric actuators. There are two ways to achieve asymmetric frictions: either by tuning the positive pressure or by tuning the friction coefficient. Compared with tuning the positive pressure by an asymmetric structure, the structural parameters can be reduced by employing a symmetric structure and tuning the friction coefficient. In this study, an asymmetric friction inertial impact actuator was developed using a symmetric compliant mechanism (SCM), and the asymmetric frictions were realized by laser te
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Alhasan, Ahmad, Omar Smadi, Georges Bou-Saab, Nacu Hernandez, and Eric Cochran. "Pavement Friction Modeling using Texture Measurements and Pendulum Skid Tester." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 40 (2018): 440–51. http://dx.doi.org/10.1177/0361198118774165.

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Pavement frictional behavior affects pavement performance in terms of vehicle safety, fuel consumption, and tire wear. Comprehending and interpreting pavement friction measurements is a challenging task, because of friction sensitivity to several uncontrollable factors. These factors include: pavement surface conditions, such as the type and thickness of contaminants and fluids on the surface and their interaction with friction forces; and the device operating conditions, such as sliding speed, material properties and geometry of the rubber slider used, and operating temperature. Despite the e
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Han, Inhwan, and B. J. Gilmore. "Multi-Body Impact Motion with Friction—Analysis, Simulation, and Experimental Validation." Journal of Mechanical Design 115, no. 3 (1993): 412–22. http://dx.doi.org/10.1115/1.2919206.

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When a multi-body system collides with a single body or with another multi-body system, impact dynamics with friction should be considered. This paper presents a general computer oriented analysis of impact dynamics incorporating friction. The presence of friction between sliding contacts during the impact makes the problem difficult since the events such as reverse sliding or sticking, which may occur at different times throughout the impact, must be determined. The boundary representations of the bodies are used to solve for the velocities at the points of contact. Using this information and
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Wang, Yu, and Matthew T. Mason. "Two-Dimensional Rigid-Body Collisions With Friction." Journal of Applied Mechanics 59, no. 3 (1992): 635–42. http://dx.doi.org/10.1115/1.2893771.

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This paper presents an analysis of a two-dimensional rigid-body collision with dry friction. We use Routh’s graphical method to describe an impact process and to determine the frictional impulse. We classify the possible modes of impact, and derive analytical expressions for impulse, using both Poisson’s and Newton’s models of restitution. We also address a new class of impacts, tangential impact, with zero initial approach velocity. Some methods for rigid-body impact violate energy conservation principles, yielding solutions that increase system energy during an impact. To avoid such anomalie
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Cojocaru, Dorian, and Dan B. Marghitu. "Impact Behavior of a Rotating Rigid Body with Impact and Viscous Friction." Mathematical Problems in Engineering 2020 (November 3, 2020): 1–11. http://dx.doi.org/10.1155/2020/5471629.

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The impact between a rotating link and a solid flat surface is considered. For the impact, we consider three distinct periods: elastic period, elastoplastic period, and restitution period. A Hertzian contact force is considered for the elastic period. Nonlinear contact forces developed from finite element analysis are used for the remaining two phases. The tangential effect is taken into account considering a friction force that combines the Coulomb dry friction model and a viscous friction function of velocity. Simulations results are obtained for different friction parameters. An experimenta
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Dissertations / Theses on the topic "Impact with friction"

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REDDA, BOYNA ROHITH. "IMPACT OF FRICTION TEST SCALE ON BRAKE FRICTION PERFORMANCE." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/2051.

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It is well known that the friction performance is a system property. The coefficient of friction and its stability, wear rate and the propensity to vibration and noise are always characteristics of a system and it is not easy to predict their performance based on smaller scale friction tests. This paper discusses the relation between performances of different-scale testers and possibility to model the friction performance of real systems in small simpler testers. It addressed the application of “scaling laws,” the application of typically adopted scaling strategies in friction industry and the
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Bonfanti, Andrea. "Low-impact friction materials for brake pads." Doctoral thesis, Università degli studi di Trento, 2016. https://hdl.handle.net/11572/369289.

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State-of-the-art friction materials for applications in disc brake systems are constituted by composite materials, specifically formulated to ensure proper friction and wear performances, under the sliding contact conditions of braking events. The bases of typical friction compound formulations usually include 10 to 30 different components bonded with a polymeric binder cross-linked in situ. Main requests to be fulfilled during braking are an adequate friction efficiency and enough mechanical resistance to withstand the torque generated by forces acting on the disc brake. Generally, each compo
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Bonfanti, Andrea. "Low-impact friction materials for brake pads." Doctoral thesis, University of Trento, 2016. http://eprints-phd.biblio.unitn.it/1808/1/Low-impact_friction_materials_for_brake_pads.pdf.

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State-of-the-art friction materials for applications in disc brake systems are constituted by composite materials, specifically formulated to ensure proper friction and wear performances, under the sliding contact conditions of braking events. The bases of typical friction compound formulations usually include 10 to 30 different components bonded with a polymeric binder cross-linked in situ. Main requests to be fulfilled during braking are an adequate friction efficiency and enough mechanical resistance to withstand the torque generated by forces acting on the disc brake. Generally, each compo
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Nordlund, Erling. "Impact mechanics of friction joints and percussive drills." Doctoral thesis, Luleå tekniska universitet, Geoteknologi, 1986. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16974.

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Impact-loaded conical and cylindrical friction joints are studied theoretically and experimentally. The system considered consists of a long, straight, cylindrical and linearly elastic rod which is impacted axially at one end, and which has a body attached by means of a friction joint at the opposite end. The conditions are such that the wave propagation is 1-D in the rod and can be neglected in the attached body. Slip and energy dissipation due to an impact load are determined. The theoretical results of the impact-loaded conical friction joints exhibit phenomena which sometimes have spectacu
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Osakue, Edward E. "A study of friction during low-velocity impact." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq54598.pdf.

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Ismail, K. A. "Impact of hard bodies with friction and compliance." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604971.

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The importance of tangential compliance and friction has been realised in order to explain phenomenon of slip reversal at the contact point observed during bounce of sports balls. An impact model that accounts for physical behaviour of the bodies during impact is required in order to accurately calculate motion of the bodies during and after impact, especially to explain the former behaviour. The present analysis incorporates effect of friction at the contact surface and tangential compliance for the contact region using lumped parameter model with discrete compliant elements oriented in the d
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Pilgrim, Michael. "The impact of differential friction on curve negotiation speed." Thesis, University of Canterbury. Engineering, 2014. http://hdl.handle.net/10092/10276.

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This thesis considers the impact of differential skid resistance between wheel paths on the speed at which a vehicle can safely negotiate a curve. Currently the New Zealand Transport Agency undertakes measurement of the co-efficient of friction on the state highway network by measuring both wheel paths, but taking the average value to represent the level of skid resistance available. Part of the basis for this approach is that modern cars have Electronic Stability Control that has historically been considered to negate the effects of any differential friction. Aside from straight line braking
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Lim, Chwee-Teck. "Effects of compliance and friction on elastic-plastic impact." Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/273133.

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Daei, Amir Reza. "IMPACT OF SOLID LUBRICANTS ON FRICTION PERFORMANCE OF ADVANCED AUTOMOTIVE BRAKE MATERIALS." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/1900.

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Automotive brake lining materials are complex composites consisting of numerous ingredients allowing for their optimal performance. Different types of carbons have been used in all types of brake pad formulations for more than century. The role of carbon, however, does not seem to be completely understood, since carbon materials possess a wide variety of characteristics and properties and they interact with other ingredients present in the friction process. Carbons/graphites are commonly considered to be solid lubricants but this role is only available at relatively low temperatures and at a s
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Wang, Wei. "Simulation of hard projectile impact on friction stir welded plate." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/7213.

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A numerical simulation is conducted using LS-DYNA to simulate hard projectile impact on a friction stir welded (FSW) plate. As the hard projectile has a wide range of velocity, mass and shape, when referring to AMC 25.963(e) of CS-25, ―Fuel Tank Access Cover‖, the hard projectile can be defined as 9.5 mm cubic-shaped steel engine debris with an initial impact velocity of 213.4 m/s (700 ft/s). This preliminary study was to evaluate whether the fuel tank adjacent skin panel joined by FSW would pass the regulation. First, the geometry and Johnson-Cook material model of the FSW joint were develope
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Books on the topic "Impact with friction"

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A, Guran, and Panagiotopoulos P. D. 1950-, eds. Proceedings of the first International Symposium on Impact and Friction of Solids, Structures and Intelligent Machines: In memoriam P. D. Panagiotopoulos (1950-1998), Ottawa Congress Centre, Ottawa, Canada, 27-30 June 1998. World Scientific, 2000.

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1950-, Mason T. David, Turay Abdul M, and Mississippi State University. Center for International Security and Strategic Studies., eds. US-Japan trade friction: Its impact on security cooperation in the Pacific Basin. MacMillan, 1991.

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1950-, Mason T. David, Turay Abdul M, and Mississippi State University. Center for International Security and Strategic Studies., eds. US-Japan trade friction: Its impact on security cooperation in the Pacific Basin. St. Martin's Press, 1991.

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Barbara, Blazejczyk-Okolewska, ed. Chaotic mechanics in systems with impacts and friction. World Scientific, 1999.

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Bank, World, ed. Sticky feet: How labor market frictions shape the impact of international trade on jobs and wages. World Bank, 2014.

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(Editor), Ardeshir Guran, ed. Friction Mechanics, Vibro - Impact Systems and Control - 2. Birkhauser Verlag AG, 2002.

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Pawel, Olejnik. Modeling, Analysis and Control of Dynamical Systems with Friction and Impacts. World Scientific Publishing Co Pte Ltd, 2017.

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Guran, Ardéshir, B. F. Feeny, A. Klarbring, and Y. Ishida. Impact And Friction Of Solids, Structures And Intelligent Machines. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/4480.

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Guran, Ardeshir. Impact and Friction of Solids, Structures and Intelligent Machines. World Scientific Publishing Co Pte Ltd, 2000.

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Mason, T. David. Us-Japan Trade Friction: Its Impact on Security Cooperation in the Pacific Basin. Palgrave Macmillan, 1991.

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Book chapters on the topic "Impact with friction"

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Weinstein, Martin E. "The Impact of Trade Problems on US-Japan Security Cooperation." In US-Japan Trade Friction. Palgrave Macmillan UK, 1991. http://dx.doi.org/10.1007/978-1-349-10788-9_6.

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Liu, Yang. "The Impact of Bacterial Surface Polymers on Bacterial Adhesion." In Polymer Adhesion, Friction, and Lubrication. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118505175.ch14.

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Cora, Sofía A., M. Marcela Vergne, and Juan C. Muzzio. "Effect of Chaotic Orbits on Dynamical Friction." In Impact of Modern Dynamics in Astronomy. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4527-5_54.

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Nikitin, L. V. "Multiple impacts of a bar with external dry friction." In Dynamics of Vibro-Impact Systems. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60114-9_25.

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Slatter, T., R. Lewis, and M. Broda. "The Influence of Induction Hardening on the Impact Wear Resistance of Compacted Graphite Iron." In Friction, Wear and Wear Protection. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch14.

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Pfeiffer, Friedrich. "On Impacts with Friction in Engineering Systems." In Vibro-Impact Dynamics of Ocean Systems and Related Problems. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00629-6_22.

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Marghitu, Dan B., and Dorian Cojocaru. "Dynamics of the Impact with Benson Friction Model." In Springer Proceedings in Physics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54136-1_2.

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La, Ngoc-Tuan, Thanh-Toan Nguyen, Ky-Thanh Ho, Quoc-Huy Ngo, and Van-Du Nguyen. "Vibro-Impact Capsule Under Different Conditions of Friction." In NODYCON Conference Proceedings Series. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-81170-9_13.

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Sanderson, Sam, and Tracy W. Nelson. "Effect of Processing Parameters on Friction Stir Welded HSLA-65 Charpy V-Notch Impact Toughness." In Friction Stir Welding and Processing VI. John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062302.ch3.

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Zhong, Zhi-Hua. "Frictional Contact-impact Problems." In Finite Element Procedures for Contact-Impact Problems. Oxford University PressOxford, 1993. http://dx.doi.org/10.1093/oso/9780198563839.003.0006.

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Abstract In Chapters 4 and 5, tangential contact forces between two contacting boundaries were not considered, i.e. frictional effects were neglected. In reality, however, friction phenomena exist wherever contacts occur. In many engineering applications, the effects of friction may play very important roles. In metal-forming processes, for example, frictional effects between the work piece and the die will strongly influence the forming process and the quality of the product. This chapter is thus devoted to discussion of numerical procedure for contact problems with friction.
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Conference papers on the topic "Impact with friction"

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Li, J., F. Lu, P. Zhao, R. Chen, and Y. Lin. "Impact friction test for friction materials." In DYMAT 2009 - 9th International Conferences on the Mechanical and Physical Behaviour of Materials under Dynamic Loading. EDP Sciences, 2009. http://dx.doi.org/10.1051/dymat/2009033.

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Braga, A., and C. Connolly. "Introduction to Permeable Friction Course (PFC) Asphalt." In Low Impact Development International Conference (LID) 2010. American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41099(367)11.

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Ostermeyer, Georg. "Dynamic Friction Laws and Their Impact on Friction Induced Vibrations." In SAE 2010 Annual Brake Colloquium And Engineering Display. SAE International, 2010. http://dx.doi.org/10.4271/2010-01-1717.

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Sullenberger, Greg A. "Pedestrian Impact on Low Friction Surface." In SAE 2014 World Congress & Exhibition. SAE International, 2014. http://dx.doi.org/10.4271/2014-01-0470.

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Fu, Li, Ying Ba, and Shu Sun. "Impact of Coulomb friction on resonance." In The 2nd Annual 2016 International Conference on Mechanical Engineering and Control System (MECS2016). WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813208414_0012.

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Pelak, Robert A. "Friction in high-speed impact experiments." In Shock compression of condensed matter. AIP, 2000. http://dx.doi.org/10.1063/1.1303681.

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Sable, Peter A., Christopher H. Neel, and John P. Borg. "High Strain-rate Shear and Friction Characterization of Fully-Dense Polyurethane and Epoxy." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-047.

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Abstract The characterization of polymer behavior at high strain-rates is a critical area of research driven by the use of polymers as adhesives, structural components, or as binders for energetic systems. Previous investigations have successfully defined Hugoniot equations-of-state for many relevant polymers such as epoxy, polycarbonate, and polyether ether ketone [1]–[4].Several studies have also explored the ramifications of polymer viscoelasticity at high strain-rates and pressures. This has been observed as nonlinearities in both propagating stress wave structure and Hugoniot state spaces
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Pfeiffer, Friedrich. "Impacts With Friction: Theory and Experiments." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8346.

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Abstract Various models for impacts with friction have been proposed, the most successful ones taking into consideration a compression and an expansion phase in normal and tangential direction. Impulses are stored during compression and released with frictional losses during expansion. Stick-slip and detachment phenomena during the impact can be considered by complementarity rules. A corresponding model for impacts with friction is presented and verified by measurements with an impact machine. In addition, some industry applications confirm the theory.
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Pelak, Robert A. "Erratum: Friction in High-Speed Impact Experiments." In Shock Compression of Condensed Matter - 2001: 12th APS Topical Conference. AIP, 2002. http://dx.doi.org/10.1063/1.1483756.

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Pfeiffer, Friedrich. "Friction and Impact Induced Vibrations in Machines." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0434.

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Abstract Paper considers friction and impacts as contact events with unilateral character. Many interconnections in machines show this behavior. Problems of modeling and practical examples are discussed.
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Reports on the topic "Impact with friction"

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Wang, P. S., and G. F. Hall. Friction, impact, and electrostatic discharge sensitivities of energetic materials. Office of Scientific and Technical Information (OSTI), 1985. http://dx.doi.org/10.2172/5667780.

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Zhang, Duan Zhong, Xia Ma, and Paul T. Giguere. NSR&D FY14 Final Report: Friction/Impact Modeling. Office of Scientific and Technical Information (OSTI), 2014. http://dx.doi.org/10.2172/1159061.

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Van Velkinburgh, J. H. HE friction sensitivity oblique impact sensitivity of explosives (the skid test). Quarterly report, July--September 1971. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/525019.

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Van Velkinburgh, J. H. HE friction sensitivity oblique impact sensitivity of explosives (the SKID test). Progress report, October 1971--December 1971. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/563857.

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Akst, I. B., B. M. Washburn, and J. K. Rigdon. Oblique impact sensitivity of explosives: The skid test the snatch friction sensitivity test. Quarterly report, April--June 1964. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/531120.

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Van Velkinburgh, J. H. HE friction sensitivity oblique impact sensitivity of explosives the skid test & half-inch gap sensitivity test. Quarterly report, April 1970--June 1970. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/527930.

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Wilfred, Wan. Nuclear Escalation Strategies and Perceptions: The United States, the Russian Federation, and China. UNIDIR, 2021. http://dx.doi.org/10.37559/wmd/21/nrr/02.

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This study is the first in a series that profiles different “friction points” among nuclear-armed and nuclear-allied States, examining issues of contention in their relations that can spark potential conflict and nuclear escalation. It considers the multipolar dynamics between the United States, the Russian Federation, and China, and examines how fundamental mistrust among the three filters into their readings of each other’s nuclear strategies, with the potential to have an impact on escalatory risk scenarios. It then outlines a series of recommendations for the ‘great powers’ to bridge strat
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Borda, Patrice, and Allan Wright. Macroeconomic Fluctuations Under Natural Disaster Shocks in Central America and the Caribbean. Inter-American Development Bank, 2016. http://dx.doi.org/10.18235/0011778.

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This paper examines the role of disaster shock in a one-sector, representative agent dynamic stochastic general equilibrium model (DSGE). First, it estimates a panel vector autoregresive (VAR) model for output, investment, trade balance, consumption, and country spread to capture the economic effects of output, country risk, and exogenous natural disaster shocks. The study determines the empirical dynamic responses of ten Caribbean countries and seven countries in Central America. Second, by taking into account rare events and trend shocks, this paper also provides a baseline framework of the
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Mahajan, Aprajit, Shekhar Mittal, Ofir Reich, and Taha Barwahwala. Using Machine Learning to Catch Bogus Firms. Institute of Development Studies, 2024. http://dx.doi.org/10.19088/ictd.2024.050.

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We investigate the use of a machine learning algorithm to identify non-existent(fraudulent) firms that are used for tax evasion. Using a rich dataset of tax returns in an Indian state over several years, we train a machine learning-based model to predict fraudulent firms. We then use the model predictions to carry out field inspections of firms identified as suspicious by the machine learning tool. We find that the machine learning model is accurate in both simulated and field settings in identifying non-existent firms. Withholding a randomly selected group of firms from inspection, we estimat
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Rahman, Shahedur, Rodrigo Salgado, Monica Prezzi, and Peter J. Becker. Improvement of Stiffness and Strength of Backfill Soils Through Optimization of Compaction Procedures and Specifications. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317134.

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Abstract:
Vibration compaction is the most effective way of compacting coarse-grained materials. The effects of vibration frequency and amplitude on the compaction density of different backfill materials commonly used by INDOT (No. 4 natural sand, No. 24 stone sand, and No. 5, No. 8, No. 43 aggregates) were studied in this research. The test materials were characterized based on the particle sizes and morphology parameters using digital image analysis technique. Small-scale laboratory compaction tests were carried out with variable frequency and amplitude of vibrations using vibratory hammer and vibrato
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