Closure to “Discussion of ‘The Friction of Lead Films in Spherical Contact’” (1973, ASME J. Lubr. Technol., 95, p. 331)

1973 ◽  
Vol 95 (3) ◽  
pp. 332-332 ◽  
Author(s):  
E. F. Finkin
Keyword(s):  
Spherical Contact ◽  
Lead Films

The Friction of Lead Films in Spherical Contact

1973 ◽  
Vol 95 (3) ◽  
pp. 328-331 ◽  
Author(s):  
E. F. Finkin
Keyword(s):  
Film Thickness ◽  
Experimental Results ◽  
Applied Mechanics ◽  
Spherical Contact ◽  
Real Area Of Contact ◽  
Recent Advances ◽  
Lead Films ◽  
Real Area

Recent advances in applied mechanics are utilized to show that Rabinowicz’s experimental results for the friction of lead films as a function of film thickness can be related to the dependence of real area of contact on film thickness.

scholarly journals Analysis of surface cracking in lubricated rolling/ sliding spherical contact.

1985 ◽  
Vol 51 (468) ◽  
pp. 2167-2173
Author(s):  
Motohiro KANETA ◽  
Minoru SUETUGU ◽  
Yukitaka MURAKAMI
Keyword(s):  
Spherical Contact ◽  
Surface Cracking

scholarly journals The optimization of pressure controller for deep earth drilling

2019 ◽  
Vol 23 (Suppl. 3) ◽  
pp. 877-885 ◽  
Author(s):  
Zhi He ◽  
Ling Chen ◽  
Tong Lu ◽  
Jing Xie
Keyword(s):  
Contact Surface ◽  
The Finite Element Method ◽  
Spherical Contact ◽  
The Earth ◽  
In Situ Conditions ◽  
Strength Material ◽  
Pressure Controller ◽  
Optimization Schemes ◽  
Deep Exploration

Obtaining samples of deep in-situ conditions is first step to explore the mysteries of the earth requires. In view of the current problems of insufficient pressure maintaining capacity of the existing equipment, we independently developed the in-situ fidelity coring system and designed the osmotic pressure controller based on the geometry of square cover. The finite element method is used to analyze the pressure maintaining capacity of the pressure controller. It is found that it would produce large deformation and stress concentration when the pressure was applied on, resulting in low pressure maintaining capacity. Then the structural optimization schemes of conical sealing contact surfaces with 25?, 35?, 40?, and 45? apex angles and spherical sealing contact surface are proposed, and the spherical contact surface structure is found to be optimal. Finally, the material is optimized, and a higher strength material such as 45CrNiMoVA alloy is used. Based on the pressure controller with spherical contact surface, the pressure maintaining capacity increased to nearly 70 MPa. The research results obtained in this paper provide the basis for the development of the coring system, the deep exploration of the earth and the establishment of rock mechanics theory.

scholarly journals Contact and Chord Length Distribution Functions of the Poisson-Voronoi Tessellation in High Dimensions

2010 ◽  
Vol 42 (1) ◽  
pp. 48-68 ◽  
Author(s):  
L. Muche
Keyword(s):  
Voronoi Tessellation ◽  
Length Distribution ◽  
Distribution Functions ◽  
Chord Length ◽  
Dimensional Euclidean Space ◽  
Spherical Contact ◽  
Chord Length Distribution ◽  
Special Cases ◽  
Contact Distribution ◽  
Contact Distribution Function

In this paper we present formulae for contact distributions of a Voronoi tessellation generated by a homogeneous Poisson point process in the d-dimensional Euclidean space. Expressions are given for the probability density functions and moments of the linear and spherical contact distributions. They are double and simple integral formulae, which are tractable for numerical evaluation and for large d. The special cases d = 2 and d = 3 are investigated in detail, while, for d = 3, the moments of the spherical contact distribution function are expressed by standard functions. Also, the closely related chord length distribution functions are considered.

scholarly journals EVALUATION OF STRENGTH OF SPHERICAL CONTACT PAIRS OF AVIATION STRUCTURES

Aviation ◽  
2010 ◽  
Vol 14 (2) ◽  
pp. 33-37
Author(s):  
Antanas Žiliukas ◽  
Bronius Merkys
Keyword(s):  
Strength Criterion ◽  
Contact Pair ◽  
Spherical Contact ◽  
Suggested Criterion

The strength criterion is used to evaluate the spherical contact pairs of the aviation structures. The strength criterion helps evaluate triaxial tension in the contact pair. Calculations reveal the acceptability of the suggested criterion. Santrauka Kontaktiniu poru stiprumui ivertinti taikomas stiprumo kriterijus, kuris naudojamas sudetingo itempiu būvio atvejais. Ši metodika leidžia skaičiavimuose atsisakyti empiriniu koeficientu. Gauti skaičiavimu rezultatai rodo kriterijaus priimtinuma, palyginti su eksperimentiniais.

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