Since the circumferential speeds can also be expressed by the rotational speeds n and pulley diameters d (v=π⋅d⋅n), the elastic slip can also be determined as follows:

Belt Slip Adhesive Spray | 400ml - Jenolite

As can be seen from the animation below, the belt is running more and more ahead due to the increasing stretching on the driven pulley. This means that the speed of an imaginary point on the belt is always slightly higher than the peripheral speed of the pulley. This corresponds to the relative motion between belt and pulley described above. The strains ε can be determined as follows using the Young’s modulus E of the belt (not to be confused with the bending modulusE b!) and the acting belt stresses σ=F/A (with A as cross-sectional area of the belt): Note: In the previous articles on belt drives, the sliding anglewas equated with the wrap anglefor reasons of conservative calculations. The statements made must then always be interpreted at the limit to sliding slip! Calculation of the elastic slip As already explained in the section Belt speeds, the belt strains ε and the belt speeds v are directly interrelated. Mathematically this can be expressed as follows:

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The peripheral speed of the driven pulley is lower than that of the driving pulley! The relative loss of speed in comparison to the driving pulley is a measure of the elastic slip! As well as increasing efficiency it can help reduce wear and tear of belts. Suitable for use with flat, ‘V’, round, rubber, leather and fabric belts. The higher the circumferential forces to be transmitted and the more elastic the belt is, the higher the elastic slip! Suitable for us on a broad range of different belts and bands, including leather, rubber and fabric, Belt Dressing spray stops slipping instantly. This long-lasting spray is available in boxes of 12 handy 400ml cans. The figure below shows schematically the distribution of the speed along the belt according to the animation above. Figure: Speed distribution along the belt

Belt slippage basics – Vulcan Grip® Belt slippage basics – Vulcan Grip®

On all applications for elimination of slip under dynamic conditions. This product is designed for use on all types of conveyors and belts including “V”, round and flat types. WHERE NOT TO USEIn the animation below, additional marking lines are attached to the pulleys for better orientation. If one compares these pulley markings with the belt markings, the relative motion between belt and pulley can be seen very clearly. Animation: Stretching and shrinking of the belt around the pulleys This product is designed to offer maximum lubrication and protection, it is not designed to deliver a shine or restore the shiny appearance of plastics. Features & Benefits: ROCOL® is part of ITW, one of the world’s leading diversified manufacturers of specialised industrial equipment, consumables and related service businesses. www.itw.com The higher the circumferential forces to be transmitted and the more elastic the belt is (e.g. low Young’s modulus!), the greater the elastic slip. With the increased elastic slip, the sliding zone also includes a larger portion of the wrap angle. Figure: Increase in elastic slip with increase in circumferential force

JENOLITE Belt Slip | Anti Slip Adhesive Spray | Dressing

S =\frac{\Delta v}{v_i} = \frac{v_i-v_o}{v_i} = \frac{v_t-v_s}{v_t} = \frac{(1+\epsilon_t) – (1+\epsilon_s)}{1+\epsilon_t} = \frac{\epsilon_t-\epsilon_s}{1+\epsilon_t} \\[5px]The relative motion on the pulleys, which is always present due to the elasticity of the belt, is called elastic slip (partial relative motion between belt and pulley)!