ISO 6601-2002 pdf free download.Plastics — Friction and wear by sliding — Identification of test parameters. 3.3 Variables involved in the friction and wear process a) type of motion (sliding, rolling, impact, flow or any combination thereof); b) variation with time (continuous, oscillatory, intermittent); c) normal load, d) surface velocity, e) temperature, ; f) test duration, 3.4 Structure of tribological systems 3.4.1 Elements a) body; b) counter-body; c) interfacial medium; d) surrounding medium. 3.4.2 Properties of the elements a) bulk properties (chemical composition, physical characteristics, mechanical properties, hardness); b) surface properties (roughness and physico-chemical characteristics). 3.4.3 Interactions between the elements a) mode of contact (see Figure 1 ); b) type of friction (dry friction, boundary lubrication, mixed lubrication, hydrodynamic lubrication, gas lubrication); c) wear mechanisms, which are often classified into 1 ) adhesive wear by tearing of adhered parts from sliding surfaces, 2) abrasive wear (abrasion) by hard particles present on sliding surfaces, 3) degradative wear by a hostile environment, 4) surface fatigue wear by a process of rolling over a track, and 5) surface wearing asperities creating ploughed surface protuberances (material deposited alongside the furrow). The modes of contact shown in Figure 1 may also be classified as follows: a) conformal: radii of curvature of the two solids in the same direction; EXAMPLE 1 Cylinder-Cylinder (internal) EXAMPLE 2 Plane-Cylinder b) non-conformal (counterformal): radii of curvature of the two solids in opposite directions. EXAMPLE 3 Sphere-Cylinder EXAMPLE 4 Cylinder-Cylinder (external)ISO 6601 pdf download.
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