Observations of dry particles behaviour at the tyre/road interface

Previous studies highlighted that friction value measured on real road surface textures covered by particles depends on particle sizes. This paper focuses on identification of particles behaviours at the tyre/road interface in the presence of particles. Identification is made by visual observations through high-speed camera, focus-variation microscopy and Scanning Electron Microscopy on the contaminated surface as scratch analysis on the surface. Two particle types were collected into samples picked next to roads. They are composed of clay and quartz which have different behaviours at the interface and affect the friction. Clay has a lasting effect due to its adhesive behaviour. Quartz has a scratching and rolling behaviour and is quickly ejected to the contact area due to a pinching effect

Le dieu aux colombes

Changarnier Adolphe. Le dieu aux colombes. In: Revue des Études Anciennes. Tome 9, 1907, n°2. pp. 186-187

Utilisation des courbes de polarisation pour étudier la tenue en eau de mer des aciers inoxydables et des bronzes. Application au cas particulier de l’usine marémotrice de la Rance

Use of polarisation curves for studying the behaviour of stainless steels and bronzes in sea water. — Considering the special case of the “La Rance” tidal power plant. Introduction. I. Danger of galvanic couples forming on the “la Rance” units : a) Principle of the method of determining these couples by means of polarisation curves ; b) Experimental results affecting the “la Rance” units. II. Possibility of cancelling out galvanic couples by cathodic protection. Effect of the latter on the behaviour of stainless steels and bronzes. a) Use of polarisation curves for determining the possibility of protecting certain metals ; b) Conclusions regarding the protection of the “la Rance” units.— Introduction. — Danger de formation de couples galvaniques sur les groupes de la Rance : a) Principe de la détermination des couples par les courbes de polarisation ; b) Résultats expérimentaux concernant les groupes de la Rance. — Possibilité d'annuler les couples galvaniques par la protection cathodique. Son influence sur le comportement des aciers inoxydables et des bronzes : a) Utilisation des courbes de polarisation pour déterminer les possibilités de protection des différents métaux ; b) Conclusions concernant la protection des groupes de la Rance.Changarnier J., Legrand R. Utilisation des courbes de polarisation pour étudier la tenue en eau de mer des aciers inoxydables et des bronzes. Application au cas particulier de l’usine marémotrice de la Rance. In: Turbines et pompes hydrauliques. Compte rendu des cinquièmes journées de l'hydraulique, Aix-en-Provence, 26, 27 et 28 juin 1958. Tome 2, 1959

Un mot sur le projet de réorganisation militaire.

Mode of access: Internet