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Sunday, July 26, 2020 | History

2 edition of Behaviour of surfaces under normal and tangential traction. found in the catalog.

Behaviour of surfaces under normal and tangential traction.

N. A. Arjmand

Behaviour of surfaces under normal and tangential traction.

by N. A. Arjmand

  • 246 Want to read
  • 13 Currently reading

Published by University of Salford in Salford .
Written in English


Edition Notes

Msc thesis, Aeronautical and Mechanical Engineering.

ID Numbers
Open LibraryOL21683540M

The incremental compliances, normal and tangential, of an interface between rough surfaces are considered. Contacts are assumed to be elliptic - the shape of Hertzian contacts between any two The characterization of the traction–separation law is non-trivial because a stack of bulk plies and delamination surfaces must be considered. Friction needs to be included because a higher traction is required for tangential opening if out-of-plane normal compression is present as ://

2. Double-Hertz model for adhesive contact between cylinders under inclined forces. Let us consider two cylinders in adhesive contact. They may be subjected to both normal and tangential forces as shown in figure loading direction is denoted by the angle θ between the normal of the contact interface and loading vector. Owing to the geometry and for infinitesimal deformation, the problem The pre-sliding and static friction force behaviour at asperity level between a smooth ball and a smooth flat surface at different normal loads, as well as friction behaviour during full slip has been studied. The normal load dependence of the friction force and the preliminary displacement is discussed when the mean contact pressure is kept under ://

In vivo biomechanics of the fingerpad skin under local tangential traction Article in Journal of Biomechanics 40(4) February with 22 Reads How we measure 'reads'   behaviour in so far as it determines the locked-in tangential displacements in those regions of the contact area which are stuck. Hence, if the distribu- tion of tangential displacement (and/or traction) can be approximated by a suitable series of functions, the amount of information carried through ~jbarber/Wearpdf.


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Behaviour of surfaces under normal and tangential traction by N. A. Arjmand Download PDF EPUB FB2

As it was shown above, the contact of rough surfaces under tangential and normal loads was considered in many papers. However, a majority of papers was focused on theoretical analysis of friction coefficient, in particular, in the initial state of sliding i.e. the static friction coefficient and the effect of tangential load on load   T he interfacial tractions induced by normal contact between dissimilar elastic cylinders are first re-evaluated, exploiting self-similarity and allowing for the influence of shear tractions on normal surface displacement.

Subsequently, a tangential force less than that necessary to cause sliding is applied, and the modified traction distribution ://   In that model, the coupling between tangential and normal tractions is defined based on the parameter (1) c = ϕ t ϕ n, where ϕ t and ϕ n are the tangential and normal works of separation, respectively.

van den Bosch et al. showed that by employing the Xu-Needleman model, the required normal traction at complete shear failure reduces to zero Tribological behaviour of contacting surfaces rigid sphere is using flat plate the with influence of normal and tangential loading (shear traction) is analysed using FEA model and surfaces being coated on flat plate by Titanium Alloy, Aluminium Alloy Molybdenum Di-sulphide.

The finite element model facilitates to Evaluating the surface variables like contact stress distribution with the &EaJ/abstract. The experiments along with the model can be used to analyse the tangential traction in the contact and the behaviour of the stick–slip area.

elastic spheres under combined normal and   Here the relative elastic displacement of the centre of the area caused by the traction τ is considered and when the magnitude of the traction reaches a critical amount τ c at the displacement δ c, the relative macro-slip occurs between the two asperity contact is taken to be contact model 1.

The contact model 1 is applicable to estimate the elastic tangential displacement   Thus, for each cell there are three unknowns: the normal pressure, p (acting in the z-direction), and the tangential tractions in two orthogonal directions, q x and q y.

The z-axis coincides with the common normal to the two contacting surfaces and the x-y plane is the tangent plane to the surfaces. There exists a unique set of tractions that   - tangential traction is parallel to the applied tangential load;-the contour lines for the tangential traction are concentrically circles.

The fretting is known to be able to produce partial slip conditions where a central part of the contact remains immobile under tangential displacement. Above a critical value of displacement, Issue 2. By default, the normal and tangential stiffness components will not be coupled: pure normal separation by itself does not give rise to cohesive forces in the shear directions, and pure shear slip with zero normal separation does not give rise to any cohesive forces in the normal direction.

For uncoupled traction-separation behavior, the terms K   0) ≡ 0 for both normal and tangential separation (this condition is not fulfilled exactly for all cohesive laws as will be shown later). Several cohesive laws (also called traction-separation laws, or decohesion laws) will be given in chapter The integration of the traction over separation, either in normal or in tangential direction, gives The relative motion between two surfaces under a normal load is impeded by friction.

Interfacial junctions are formed between surfaces of asperities, and sliding inception occurs when shear tractions in the entire contact area reach the shear strength of the weaker material and junctions are about to be ://   INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, VOL, () AN INTERFACE MODEL FOR ANALYSIS OF DEFORMATION BEHAVIOUR OF DISCONTINUITIES Z.

MROZ Institute of Fundamental Technological Research, Polish Academy of kzyska Warsaw, Poland G. GIAMBANCO Dipartimento di Abstract. This study provides some insights into the micro-slip behaviour of geological materials. The micromechanical experiments are conducted using a custom-built grain-scale apparatus on Leighton buzzard sand (LBS), which is a soil of relatively smooth and stiff grains, and completely decomposed volcanic (CDV) granules, which is a material composed of very rough and soft ://   surfaces takes place, and that Coulomb’s friction law holds in the form: q(x)=fp(x) (1) and complex material constitutive behaviour.

Under the assumption of linear elastic deformation, the BIEM is probably the method of choice in as far as the calculation of normal and tangential traction distributions ~engs/ For surfaces without a long wavelength cut-off, the contact stiffness k z was found to be a power function of normal load 7,8: where z is the coordinate axis perpendicular to the surface and H is the Hurst exponent.

Tangential contact of rough surfaces was studied in 9,10 and   Since natural and industrial surfaces always possess roughness under certain magnification, the contact between solid bodies occurs on the maximal tangential traction at the contact spots is proportional to the normal pressure, therefore the as well as the simulation and analysis of the frictional behaviour of the system under normal The normal contact stiffness k z of rough surfaces has been shown to be proportional to the normal load in the case of “nominally flat” surfaces (surfaces whose roughness power spectrum has a It is proved that the tangential traction under constant normal forces and increasing tangential forces is equal to the difference between the actual normal pressure and the pressure for a smaller Under certain assumptions, however, the frictional problem can be reduced to the normal problem (Jäger, [3]).

The reduced friction model assumes that each stick area H is a smaller contact area C*. According to Coulomb’s law q = f p, the tangential traction q in the slip area C – C* is proportional to the normal pressure p of the actual In order to make the procedure straightforward and as general as possible, a non-dimensional formulation, based only on the normal contact load displacement curve, is proposed.

The cyclic behaviour of the tangential contact of self-affine fractal surfaces, like those generated by fracture of concrete or rock, is described with several ://. normal and tangential components of the surface traction. The proposed approach is used to study flows in a Single rotor mixer (see Figure 1) under linear slip conditions with the thermal jump effect at the surface.

The 16 Boundary Elements and Other Mesh Reduction Methods XXXII WIT Transactions on Modelling and Simulation,   1. Introduction. Human haptic behaviour depends critically on the efficient integration of afferent tactile signals. Such signals are produced by thousands of mechanoreceptors that innervate the glabrous skin and are stimulated by skin deformation [1–5].These signals enable the central nervous system (CNS) to be aware of the properties of a touched surface, allowing the CNS to adapt its normal and tangential surface stresses are analyzed in this paper.

It is proved that the tangential traction under constant normal forces and increasing tangential forces is equal to the difference between the actual normal pressure and the pressure for a smaller contact area, multiplied by the coefficient of friction.

Every stick area corre­?doi=&rep=rep1&type=pdf.