A mathematical model describing the law of contact gliding friction, taking into account changes in sliding states, is proposed for consideration. The generalization classical linear models friction carried out by putting more additive components allowing new state transitions frictional interaction.
 developed makes it possible to give analytic description schematic diagram slip coefficie...

The thesis focuses on the solution of both coercive and semi–coercive contact problems by using the Boundary Element Tearing and Interconnecting (BETI) method, which represents a boundary element counterpart of the Finite Element Tearing and Interconnecting (FETI) method. The BETI approach, which uses “tearing” the domain into non–overlapping subdomains and subsequent “gluing” along the artific...

In this paper, static indentation and low velocity impact responses of a fully backed composite sandwich plate subjected to a rigid flat-ended cylindrical indenter/impactor are analytically investigated. The analysis is nonlinear due to nonlinear strain-displacement relation. In contrast to the existed analytical models for the indentation of composite sandwich plates, the stacking sequence of ...

Pirrotta L et al. Patients with allergic contact dermatitis to nickel and nonallergic individuals display different nickel-specific T cell responses. Evidence for the presence of effector CD8+ and regulatory CD4+ T cells. J Invest Dermatol 1998; 111: 621–628. 2 Artik S, von Vultée C, Gleichmann E, Schwarz T, Griem P. Nickel allergy in mice: enhanced sensitization capacity of nickel at higher ox...

Shape memory alloys are well recognized functional and smart materials, which have been exploited to develop intelligent structures and devices in many fields. Of particular importance is its exciting application in the field of biomechanical engineering. In addition, further potential applications of shape memory alloys are being investigated, such as shape memory alloys-based functional compo...

The paper adopts a geometric approach to stabilization and tracking of a spherical robot actuated by three internal rotors mounted on three mutually orthogonal axes inside the robot. The system is underactuated and subject to nonholonomic constraints. Initially, the equations of motion are derived through Euler-Poincaré reduction. Then two feedback control laws are synthesized: the first contro...

The present investigations on sealability evaluation for tubing and casing premium connections depend the FEM with testing. This paper proposed a theoretical model to evaluate of sphere-type connection based make-up torque, which combines Hertz contact pressure von Mises yield criterion calculating elastic–plastic distribution sealing interface adopts gas obtained from Murtagian’s experimental ...

Within this paper we explore transition paths firms can take to become product service system (PSS) innovators. Applying the dynamic capability approach we study how three firms have developed PSS innovations in the mobility sector (Car2Go by Daimler AG, Connect by Hertz by The Hertz Corporation, Better Place). We explore the different paths the firms have taken originating from different capab...

T h e frict,ion behavior of rubber materials on various contact surfaces is strongly affected by the contact pressure and the relative sliding velocity. Based on a great number of experiment,^ of rubber block moving on concrete surfaces. a friction law is present,ed in this paper. It is characterized b~ a dependence on contact pressure and sliding velocity. The identification of the required pa...

We investigate next-nearest-neighbor correlations of the contact number in simulations of polydisperse, frictionless packings in two dimensions. We find that disks with few contacting neighbors are predominantly in contact with disks that have many neighbors and vice versa at all packing fractions. This counterintuitive result can be explained by drawing a direct analogy to the Aboav-Weaire law...