The interrelationship of the properties of the base material and the ?third body? in powder metallurgy antifriction materials from the point of view of the theory of fatigue wear

1989 ◽  
Vol 28 (6) ◽  
pp. 475-479
Author(s):  
G. Kh. Karapetyan
Keyword(s):  
Powder Metallurgy ◽  
Base Material ◽  
Point Of View ◽  
Third Body ◽  
Fatigue Wear ◽  
The Third ◽  
Antifriction Materials

scholarly journals AN ANALYTICAL APPROACH TO THE THIRD BODY MODELLING IN FRETTING WEAR CONTACT: A MINIREVIEW

2021 ◽  
Vol 19 (1) ◽  
pp. 125
Author(s):  
Ivan I. Argatov ◽  
Young Suck Chai
Keyword(s):  
Contact Mechanics ◽  
Wear Debris ◽  
Analytical Approach ◽  
Point Of View ◽  
Analytical Modelling ◽  
Fretting Wear ◽  
Third Body ◽  
The Third ◽  
Recent Developments

In fretting wear contact, the third body is defined as the wear debris bed between two contacting bodies. The problem of third-body modelling is considered from a point of view of contact mechanics. This paper is restricted to a discussion of recent developments in analytical modelling of fretting wear contact.

Thermal Study of the Dry Sliding Contact With Third Body Presence

2008 ◽  
Author(s):  
David Richard ◽  
Mathieu Renouf ◽  
Yves Berthier ◽  
Ivan Iordanoff
Keyword(s):  
Thermal Study ◽  
Point Of View ◽  
Sliding Contact ◽  
Dry Sliding ◽  
Third Body ◽  
Contact Conditions ◽  
Microscopic Scale ◽  
The Third ◽  
Local Cohesion

The objective of this paper is to highlight the influence of the rheology of a third body in dry sliding contact conditions. It has been shown that the local cohesion of the third body can create an asymmetric dissipative field through its thickness. The present study puts forward the consequences from a thermal point of view, overcoming the inherent experimental difficulties at this microscopic scale.

Thermal Study of the Dry Sliding Contact With Third Body Presence

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
David Richard ◽  
Ivan Iordanoff ◽  
Mathieu Renouf ◽  
Yves Berthier
Keyword(s):  
Theoretical Study ◽  
Contact Problems ◽  
Thermal Study ◽  
Point Of View ◽  
Sliding Contact ◽  
Contact Interface ◽  
Third Body ◽  
The Third ◽  
The Past ◽  
Numerical Predictions

When the thermal aspect of sliding contacts is investigated, few models take into account the presence of a third body at the contact interface. Moreover, when the presence of the third body is considered, its rheology is neglected. For this reason, the thermal study of such contact configuration is not fully understood and relies on strong hypothesis or even important simplifications. To fill this lack of knowledge, a thermal model has been developed embedded in a discrete element scheme. Such investigations highlight the key role played by both thermal and mechanical properties of the contact elements. If the third body rheology can affect the localization of the heat generation leading to important thermal asymmetries, the diffusive nature of the first bodies can also strongly control the phenomenon and accentuate or diminish the initial differences of surfaces temperature for the contacting volumes. The goal of this paper is to bring information or complete existing theories (Blok, H. A., 1937, “Theoretical Study of Temperature Rise at Surface at Actual Contact Under Oilness Lubricating Conditions,” I. Mech. E. Conf. Publ., 2, pp. 222–235;Ryhming, I. L., 1979, “On Temperature and Heat Source Distributions in Sliding Contact Problems,” Acta Mech., 32, pp. 261–274;Dragon-Louiset, M., and Stolz, C., 1999, “Approche Thermodynamique des Phénomenès liés à l’Usure de Contact,” Acad. Sci. Paris, C. R., 327, pp. 1275–1280) but also to bring a new point of view on the differences observed in the past between the numerical predictions and experimental measurements.

scholarly journals Analysis of surface structure of zirconia crystals in case of friction against steel

2020 ◽  
Vol 329 ◽  
pp. 02008
Author(s):  
Valery Alisin ◽  
Mikhail Borik ◽  
Alexey Kulebyakin ◽  
Elena Lomonova ◽  
Irina Suvorova
Keyword(s):  
Dry Friction ◽  
Friction Surface ◽  
Friction Pair ◽  
Base Material ◽  
Electron Microscopic Examination ◽  
Third Body ◽  
Electron Microscopic ◽  
The Third ◽  
Transfer Films ◽  
Friction Surfaces

The article considers the formation of the third body during dry friction of the nanostructured zirconia crystals partially stabilized with yttria against steel. The assumption is substantiated that the tribological properties of the studied friction pair are determined by the properties of the films formed on the surface of the crystals. Friction tests under sliding conditions were performed according to the “disk-finger” scheme. The results of electron microscopic examination of the friction surfaces of crystals are presented. The elemental composition was determined, and the phase composition of the transfer films of various sections of the crystal friction surface was calculated. At high magnifications, it was found that the friction surface of samples with 2-4 mol.% of Y2O3 has the sufficiently homogeneous structure of the films with traces of boundaries of smaller particles of the transferred material. Destruction of the friction surface of a sample with a Y2O3 content of 8 mol.% occurs at a deeper level and affects not only the layer of secondary structures, but also the underlying layers of the base material.

Dental Inclusion of Canine and Wisdom Tooth in Orthodontics Chemical Necroses

2018 ◽  
Vol 69 (8) ◽  
pp. 2191-2196
Author(s):  
Cristian Constantin Budacu ◽  
Nicoleta Ioanid ◽  
Cristian Romanec ◽  
Mihail Balan ◽  
Liliana Lacramioara Pavel ◽  
...  
Keyword(s):  
Third Molar ◽  
Point Of View ◽  
Separate Entity ◽  
Wisdom Tooth ◽  
Facial Aesthetics ◽  
The Third ◽  
Edentulous Mandible ◽  
Canine Guidance ◽  
Upper Jaw ◽  
Functional Point

Canine plays an important role in the dento-maxillary system. From a functional point of view, it provides the canine guidance, by positioning it in the frontal area, has a role in facial aesthetics. It plays an important prosthetic role by having the longest root and one of the longest arcade teeth. Three molars represent the last teeth that erupt in the arches both in the jaw and in the mandible, which is why they remain the most frequently included.Canine incidence is quite common following the wisdom tooth. It can be unilateral or bilateral and is more common in the upper jaw. The canine may remain included at the vestibular, palatal or between the two bones. A separate entity is the incision of the canine in the edentulous mandible or jaw. The study included 213 cases with dento-alveolar pathology, of which 128 patients were selected with dental inclusion. Our study reports that the first three molars are frequent, followed by the canine as opposed to other studies conducted by Guzduz K in 2011 and Fardi A of the same year bringing the canines first (Fardi, Guzduz). Some studies attribute the first place to the superior canine in terms of frequency, but they are abstracted from the molar three inclusion that they consider as most frequently (Compoy). The most common tooth in inclusion is the third molar (lower and upper) followed by the upper canine; the most commonly affected are women for both canine and molar.

The Limit Situation And The Narrative Of War (On The Material Of The Novel “My Lieutenant” By Daniil Granin)

2020 ◽  
Vol 6 (1) ◽  
pp. 90-104
Author(s):  
Anatoly S. Kuprin ◽  
Galina I. Danilina
Keyword(s):  
20Th Century ◽  
Scientific Work ◽  
Point Of View ◽  
Continuous Limit ◽  
The Novel ◽  
Term Limit ◽  
Abstract Author ◽  
The Third ◽  
Definition Of

The purpose of this study is the analysis of limit situation in the narrative of war. The material of the study is the novel of Daniil Granin “My Lieutenant” and related texts. In the first part of the paper, the authors explore existing approaches to the term “limit situation” and similar concepts into scientific and philosophical traditions; limits of its applicability in literary studies and its relation to the categories of “narrative instances” and “event”. Proposed a literary-theoretical definition of the limit situation, which can be used in the analysis of fiction texts. Existing approaches to the examination of the situation of war are analyzed: philosophical-existential, psychoanalytic, sociological, literary. In the second part of the paper, the authors propose their method for analyzing limit situations in texts about war, which basis on existing approaches and preserves the text-centric principle of studying the structure of the story. Two interrelated areas of research have been identified: the study of war as a continuous limit situation in the intertextual aspect (the discourse of war); the study of limit situations (death, suffering, guilt, accident) in the narrative of war as part of a specific text. In the third part of the scientific work,the analysis of war as a continuous limit situation results in the study of the concept of “limit” (border) in a fiction text. The role of “limit” (border) concept in the texts about the war is studied, the possible types of limits in the discourse of war are examined. Limit situations in the narrative of war are analyzed on the basis of the novel “My Lieutenant” by Daniil Granin. A review of journalistic and scientific works about the novel revealed both the continuity and the differences between the novel and the “lieutenant” prose of the 20th century. An analysis of the limit situations in the novel revealed their key position in the narrative. These situations are independent of the fiction time, of the fluctuation of the point of view’; the function of the abstract author is to build the narrative as a “directive” immersion of the hero and narrator in these situations.

Presentation

2014 ◽  
Vol 2 (3) ◽  
Author(s):  
Redacción CEIICH
Keyword(s):  
Cultural History ◽  
Social Reality ◽  
Point Of View ◽  
The Body ◽  
Literary Studies ◽  
The Third ◽  
The Social ◽  
Feminist Theories ◽  
History Of

<p class="p1">The third number of <span class="s1"><strong>INTER</strong></span><span class="s2"><strong>disciplina </strong></span>underscores this generic reference of <em>Bodies </em>as an approach to a key issue in the understanding of social reality from a humanistic perspective, and to understand, from the social point of view, the contributions of the research in philosophy of the body, cultural history of the anatomy, as well as the approximations queer, feminist theories and the psychoanalytical, and literary studies.</p>

scholarly journals Extended analytical formulae for the perturbed Keplerian motion under low-thrust acceleration and orbital perturbations

2021 ◽  
Vol 133 (3) ◽  
Author(s):  
Marilena Di Carlo ◽  
Simão da Graça Marto ◽  
Massimiliano Vasile
Keyword(s):  
Gravitational Perturbation ◽  
Low Thrust ◽  
Orbital Elements ◽  
Third Body ◽  
The Third ◽  
Orbital Perturbations ◽  
Analytical Formulae ◽  
Numerical Orbit ◽  
Body Potential

AbstractThis paper presents a collection of analytical formulae that can be used in the long-term propagation of the motion of a spacecraft subject to low-thrust acceleration and orbital perturbations. The paper considers accelerations due to: a low-thrust profile following an inverse square law, gravity perturbations due to the central body gravity field and the third-body gravitational perturbation. The analytical formulae are expressed in terms of non-singular equinoctial elements. The formulae for the third-body gravitational perturbation have been obtained starting from equations for the third-body potential already available in the literature. However, the final analytical formulae for the variation of the equinoctial orbital elements are a novel derivation. The results are validated, for different orbital regimes, using high-precision numerical orbit propagators.

scholarly journals William II of Hauteville (1171–1189)

Encyclopedia ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 542-551
Author(s):  
Mirko Vagnoni
Keyword(s):  
Point Of View ◽  
The Third

William II of Hauteville King of Sicily (1171–1189). William II of Hauteville was the third king of the Norman dynasty on the throne of Sicily. He ruled independently from 1171 (from 1166 to 1171 he was under the regency of his mother) to 1189. From an iconographic point of view, he is particularly interesting because he was the first king of Sicily who made use of monumental images of himself. In particular, we have five official (namely, commissioned directly by him or his entourage) representations of him: the royal bull, the royal seal, and three images from the Cathedral of Monreale (near Palermo): two mosaic panels and one carved capital.

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