Chemnitz, GermanySince the early 2000s efforts have been made to introduce a new way to calculate the lifetime for a rope in rope drives, nowadays implemented in EN 13001-3-2. This elaborated standard uses a cycle-based approach instead of a time-based approach, previously well-established for many years in DIN 15020-1 for example. Since its introduction, many discussions arose towards the cycle-based approach, especially regarding safety and multi-layer spooling. In 2015, a working group in TC96/SC3 has been established to revise ISO 16625 to adopt the cycle-based approach of EN 13001-3-2 and beyond that to enhance it. The enhancement addresses the special requirements of multi-layer spooling and provides a new foundation for the proof of fatigue strength. This “New Method” for the proof of fatigue strength is based on the Feyrer formula. The “New Method” was developed and verified in a collaboration between the Universities of Karlsruhe, Dresden, and Stuttgart. Combining the “New Method” with the cycle-based approach implemented in EN 13001-3-2 leads to the new approach for ISO 16625. The paper will report the initial situation, the developments of the “New Method” and describes the new approach for ISO 16625 subsequently.

Markus Golder
Professor
Technischen Universität Chemnitz
Chemnitz, Germany