نتایج جستجو برای: shear friction

تعداد نتایج: 103786  

Journal: :Physical review letters 2014
A Fall B Weber M Pakpour N Lenoir N Shahidzadeh J Fiscina C Wagner D Bonn

We show experimentally that the sliding friction on sand is greatly reduced by the addition of some-but not too much-water. The formation of capillary water bridges increases the shear modulus of the sand, which facilitates the sliding. Too much water, on the other hand, makes the capillary bridges coalesce, resulting in a decrease of the modulus; in this case, we observe that the friction coef...

2013
Nicolas Fernandez Roman Mani David Rinaldi Dirk Kadau Martin Mosquet Hélène Lombois-Burger Juliette Cayer-Barrioz Hans J. Herrmann Nicholas D. Spencer Lucio Isa

We propose a simple model, supported by contact-dynamics simulations as well as rheology and friction measurements, that links the transition from continuous to discontinuous shear-thickening in dense granular pastes to distinct lubrication regimes in the particle contacts. We identify a local Sommerfeld number that determines the transition from Newtonian to shear-thickening flows, and then sh...

Journal: :Physical review letters 2013
Nicolas Fernandez Roman Mani David Rinaldi Dirk Kadau Martin Mosquet Hélène Lombois-Burger Juliette Cayer-Barrioz Hans J Herrmann Nicholas D Spencer Lucio Isa

We propose a simple model, supported by contact-dynamics simulations as well as rheology and friction measurements, that links the transition from continuous to discontinuous shear thickening in dense granular pastes to distinct lubrication regimes in the particle contacts. We identify a local Sommerfeld number that determines the transition from Newtonian to shear-thickening flows, and then sh...

Journal: :Journal of the Royal Society, Interface 2011
C Pailler-Mattei C Guerret-Piécourt H Zahouani S Nicoli

The present study deals with the modification of the human skin biotribological behaviour after tape stripping. The tape-stripping procedure consists in the sequential application and removal of adhesive tapes on the skin surface in order to remove stratum corneum (SC) layers, which electrically charges the skin surface. The skin electric charges generated by tape stripping highly change the sk...

Ring rolling is one of the most significant methods for producing rings with highly precise dimensions and superior qualities such as high strength uniformity, all accomplished without wasting any materials. In this article, we have achieved analytical formulas for calculating the pressure and shear friction over the contact arcs between the rollers and ring in the ring rolling process for the ...

2009
Pedro J. Arrazola Tuğrul Özel

Accurately predicting the physical cutting process variables, e.g. temperature, velocity, strain and stress fields, plays a pivotal role for predictive process engineering for machining processes. These predicted field variables, however, are highly influenced by workpiece constitutive material model (i.e. flow stress), thermo-mechanical properties and contact friction law at the tool–chip–work...

2017
Krisztián Kotrocz György Kerényi

One of the most common methods to measure soil mechanical properties (namely cohesion and internal friction angle) is direct shear box test. In this paper the development of a three-dimensional (3D) discrete element soil model for simulation of a cohesive soil’s direct shear test is presented. The aim was to calibrate the properties of the Hertz-Mindlin with bonding contact model available in E...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2003
Caroline Pujolle-Robic Laurence Noirez

The recent identification of shear-induced phases in the isotropic melts of liquid crystal polymers shows that these materials are expected to display original nonlinear behaviors. We have investigated the flow behavior of a nematic sidechain polymer above its isotropic-nematic transition temperature. Nonlinear rheology and birefringence measurements indicate the appearance, above a critical sh...

2006
Hamid Ullah M. A. Irfan V. Prakash

In the present paper the applicability of state and rate dependent friction laws in describing the phenomena of high speed slip at metal-on-metal interfaces is investigated. For the purpose of model validation, results of plate-impact pressure-shear friction experiments were conducted by Irfan in 1998 and Irfan and Prakash in 2000 using a Ti6Al4V and Carpenter Hampden tool-steel tribo pair are ...

2009
Yong Zhu Qingquan Qin Yi Gu Zhong Lin Wang

The friction and shear strength of nanowire (NW)-substrate interfaces critically influences the electrical/mechanical performance and life time of NW-based nanodevices. Yet, very few reports on this subject are available in the literature because of the experimental challenges involved and, more specifically no studies have been reported to investigate the configuration of individual NW tip in ...

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