The friction and wear of Kevlar 49 sliding against aluminium at low velocity under high contact pressures
✍ Scribed by I.F Brown; C.J Burgoyne
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 380 KB
- Volume
- 236
- Category
- Article
- ISSN
- 0043-1648
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✦ Synopsis
The friction and wear behaviour of Kevlar 49 sliding against aluminium under large contact pressures at low sliding velocities was examined. Kevlar 49 on aluminium friction is measured using yarns on capstans, and compared with literature results for Kevlar 49 on itself. A modified version of Howell's equation is presented in terms of stresses, t s as b , to allow finite element modelling of rope terminations. For Kevlar 49-on-aluminium this takes the form t s 0.099s 0.91 and t s 0.095s 0.91 . Kevlar 49-on-Kevlar 49 friction is s d Ž . not so critical in the mechanics of the terminations as it is greater m ™ 0.22 at high pressures . Medium scale tests using yarns of 1000 filaments around capstan discs of radii 10-80 mm were performed; these are compared with large scale tests on 6 and 60 tonne rope terminations. In both situations the wear rate is calculated from the number of cycles to failure for a given severity regime. The wear rate Ž . is found to be directly proportional to the normal load for five orders of magnitude of load 6-40000 N , so Kevlar 49-on-aluminium abrasion can be expressed in terms of the Archard wear equation. The dimensional wear coefficient is found to depend strongly on the y5 3 Ž . y1 y2 3 Ž . y1 amplitude of slip present, rising from 1.0 = 10 mm Nm at 40 mm to 1.0= 10 mm Nm at 3 mm peak to peak displacement.