creep marks

creep

creepi. The gradual rotation of a tire around a wheel. To detect creeping, white index marks are made on tires and wheels and are called creep marks. Some tires have two molded arrows in between which creep marks are painted.
ii. The property of a metal that allows it to be permanently deformed when subject to stress (e.g., turbine blades that operate at temperatures at which creep can become serious). Creep increases with temperature, duration, and magnitude of force.
Primary creep, stage 1, is a period of decreasing creep rate. Primary creep is a period of primarily transient creep. During this period deformation takes place and the resistance to creep increases until stage 2. Secondary creep, stage 2, is a period of roughly constant creep rate. Stage 2 is referred to as steady state creep. Tertiary creep, stage 3, occurs when there is a reduction in cross sectional area due to necking or effective reduction in area due to internal void formation.

slippage mark

A small white mark (1” to 1½” wide) painted on the sidewalls of a newly fitted tire and continued to the wheel rim. This white mark detects the movement of the tire in relation to the wheel. If the mark on the tire is not aligned with the mark on the wheel, it shows that the tire has slipped on the wheel. In such a case, the tire should be removed, as the valve in the tube is likely to be damaged. Also called creep marks