Experimental Study of Load Sharing in Roller-Bearing Contact by Caustics and Photoelasticity

Raptis, K.; Papadopoulos, George Α.; Costopoulos, Theodore N.; Tsolakis, Andonios D.

doi:10.3844/ajeassp.2011.294.300

Cited by 14 publications

(9 citation statements)

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“…In the case of the plane elastic problem the method was first introduced by Manogg [1][2][3][4] for the case of Transmitted Caustics and then it was broadened by Theocaris [5,6] who included the method of Reflected Caustics, to be used soon after on numerus applications [7] keeping used uninterruptedly up to nowadays. In this context, a wide variety of problems has been confronted by the method of caustics, as, the description of the stress intensity in T elastostatic problems [8][9][10], the mechanical behaviour and crack propagation under dynamic loading conditions [11][12][13][14][15][16][17], the measurement of strain concentration in plasticity problems [18], the determination of the J-integral [19], the determination of stress-optical as well as elastic constants of materials [20][21][22], the location of the crack-tip position [23], the description of load distribution and the definition of the contact length in contact problems [24][25][26][27][28][29]. What is more, the method has been successfully applied to a wide range of materials, including birefringent ones [30], rock-like [31] and anisotropic ones [32][33][34][35], viscoelastic ones [36] and even composite [37] or graded ones [38].…”

Section: Introductionmentioning

confidence: 99%

Double initial and caustic curves in diametrically compressed transparent discs - Application to the contact length

Markides

2019

Frattura Ed Integrità Strutturale

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General formulae for double initial and caustic curves (reflected and transmitted) are obtained in the case of smooth contact of two cylindrical elastic bodies of arbitrary radii. Namely, based on the method of reflected and transmitted caustics, the conditions for the development of double initial and contact caustic curves are established as functions of six independent parameters, while easy-to-use closed-form expressions are given for obtaining the contact length. An experimental protocol is then implemented in the case a thin cylindrical transparent disc is compressed between the jaws of the International Society for Rock Mechanics suggested device for the execution of the Brazilian-disc test. The experimental method of caustics can provide the contact length quite accurately, even in the case of double curves which seem that are not always a consequence of a wide contact region. KEYWORDS. Double initial and caustic curves; Compressed discs; Contact length Citation: Markides, Ch. F., Double initial and caustic curves in diametrically compressed transparent discs-Application to the contact length, Frattura ed Integrità Strutturale, 50 (2019) 451-470.

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Section: Introductionmentioning

confidence: 99%

Double initial and caustic curves in diametrically compressed transparent discs - Application to the contact length

Markides

2019

Frattura Ed Integrità Strutturale

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“…The program has produced many advances in stealth technology and in designing and manufacturing methods. These achievements have been applied to other Boeing programs, including the F/A- Abbas, 2009;Abu-Ein, 2009;Opafunso et al, 2009;Semin et al, 2009a-c;Zulkifli et al, 2009;Ab-Rahman et al, 2009;Abdullah and Halim, 2009;Zotos and Costopoulos, 2009;Feraga et al, 2009;Bakar et al, 2009;Cardu et al, 2009;Bolonkin, 2009a-b;Nandhakumar et al, 2009;Odeh et al, 2009;Lubis et al, 2009;Fathallah and Bakar, 2009;Marghany and Hashim, 2009;Kwon et al, 2010;Aly and Abuelnasr, 2010;Farahani et al, 2010;Ahmed et al, 2010;Kunanoppadon, 2010;Helmy and El-Taweel, 2010;Qutbodin, 2010;Pattanasethanon, 2010;Fen et al, 2011;Thongwan et al, 2011;Theansuwan and Triratanasirichai, 2011;Smadi, 2011;Tourab et al, 2011;Raptis et al, 2011;Momani et al, 2011;Ismail et al, 2011;Anizan et al, 2011;Tsolakis and Raptis, 2011;Abdullah et al, 2011;Kechiche et al, 2011;Ho et al, 2011;…”

Section: Introductionmentioning

confidence: 99%

About Boeing X-32

Petrescu¹

2019

Journal of Aircraft and Spacecraft Technology

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The Boeing X-32 is a demonstration jet designed for the Joint Strike Fighter contest. He lost the Lockheed Martin X-35 demonstrator, which was further developed in the Lockheed Martin F-35 Lightning II. Boeing's competitive advantage has been to provide considerably lower costs of production and lifecycle by minimizing variations between different versions of the JSF. Therefore, the X-32 was designed around a delta wing of the carbon fiber composite. The wing had an opening of 9.15 meters, with a current of 55 degrees on the front edge and could have up to 20,000 kilograms of fuel. The purpose of the large inclination angle was to allow the use of a thick wings section while obtaining limited transonic aerodynamic resistances and a good angle for the corresponding antenna equipment installed in the wing. Wings would be a challenge to be done. The cost competition strategy also led Boeing to choose a direct traction vectoring system for the short-term STOVL landing requirement, as this would require the addition of a traction vectoring module around the main engine. However, this choice requires the engine to be mounted directly behind the cockpit and changing the center of gravity before being ordinarily positioned in the jets of the plane (behind the plane) to allow neutral movement of the attitude. Boeing proposed in the 1960s a supersonic fighter as a gravity motor with vector pushing nozzles, but never surpassed the images published in the aviation week. By comparison, Lockheed's entry showed, if not, a smaller version of the F-22 Raptor stealth fighter. The nickname of X-32, Boeing, was "Monica. " However, another direct lifting selection effect was the chrome-air intake, similar to the Vought F-8 Crusader and LTV A-7 Corsair II. This was necessary to provide sufficient air for the main engine (to provide the force of support) during the zero speed horizon when it could not exploit the ram air pressure. A blow to the effect of this large input was the direct potential visibility of the compressor blades to the radar. Among the possibilities of attenuation were the variable moments designed to lock the received radio waves without adversely affecting the air flow.

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“…It is a perfect laboratory to study the formation and evolution of rocky planets. Scientists know that Mars has low geological activity, but a Lander like InSight can reveal as long as Mars is active (Aversa et al, 2017a;and Hashim, 2009;Kwon et al, 2010;Aly and Abuelnasr, 2010;Farahani et al, 2010;Ahmed et al, 2010;Kunanoppadon, 2010;Helmy and El-Taweel, 2010;Qutbodin, 2010;Pattanasethanon, 2010;Fen et al, 2011;Thongwan et al, 2011;Theansuwan and Triratanasirichai, 2011;Tourab et al, 2011;Raptis et al, 2011;Momani et al, 2011;Ismail et al, 2011;Anizan et al, 2011;Tsolakis and Raptis, 2011;Abdullah et al, 2011;Kechiche et al, 2011;Ho et al, 2011;Rajbhandari et al, 2011;Aleksic and Lovric, 2011;Kaewnai and Wongwises, 2011;Idarwazeh, 2011;Ebrahim et al, 2012;Abdelkrim et al, 2012;Mohan et al, 2012;Abam et al, 2012;Hassan et al, 2012;Jalil and Sampe, 2013;Jaoude and El-Tawil, 2013;Ali and Shumaker, 2013;Zhao, 2013;El-Labban et al, 2013;Djalel et al, 2013;Nahas and Kozaitis, 2014).…”

Section: Introductionmentioning

confidence: 99%

Giant Success for NASA when the InSight Probe has Reached "Safety" on Mars

Petrescu¹

2019

Journal of Aircraft and Spacecraft Technology

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InSight-Studying the 'Inner Space' of Mars. InSight, short for Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, is a Mars lander designed to give the Red Planet its first thorough checkup since it formed 4.5 billion years ago. It is the first outer space robotic explorer to study in-depth the "inner space" of Mars: Its crust, mantle and core. Studying Mars' interior structure answers key questions about the early formation of rocky planets in our inner solar system-Mercury, Venus, Earth and Mars-more than 4 billion years ago, as well as rocky exoplanets. InSight also measures tectonic activity and meteorite impacts on Mars today. The lander uses cutting edge instruments, to delve deep beneath the surface and seek the fingerprints of the processes that formed the terrestrial planets. It does so by measuring the planet's "vital signs": Its "pulse" (seismology), "temperature" (heat flow) and "reflexes" (precision tracking). This mission is part of NASA's Discovery Program for highly focused science missions that ask critical questions in solar system science.

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Experimental Study of Load Sharing in Roller-Bearing Contact by Caustics and Photoelasticity

Cited by 14 publications

References 12 publications

Double initial and caustic curves in diametrically compressed transparent discs - Application to the contact length

Double initial and caustic curves in diametrically compressed transparent discs - Application to the contact length

About Boeing X-32

Giant Success for NASA when the InSight Probe has Reached "Safety" on Mars

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