Abstract
Steel wire ropes have established as transmission, connection and safety elements in transporters such as cranes and elevators, due to their high breaking strength and operational safety as well as out of many years of experience. However, steel wire ropes have disadvantages such as high dead weight, high bending stiffness and sensitivity to corrosion. Increasing requirements on the energy-efficient and resource-saving operation of technical systems demand new materials, technologies and processes. As a result, textile machine elements like HM-HT fibre ropes (high modulus, high tenacity) come into focus of considerations. The aim of the research is to expand the level of knowledge with regard to the state of wear and aging. Another aim is to find out the influencing factors on the lifetime, discard criteria of high-strength fibre ropes and to derive methods for lifetime detection.
Highlights
Due to their favourable breaking force-mass ratio HM-HT fibre ropes are an alternative to steel wire ropes, see Figure 1
Other advantages of using HM-HT fibre ropes compared to steel wire ropes with comparable breaking strength are: – increase in lifting masses and lengths, – reduction in the required drive power, – reduction in bending stiffness, – good chemical and corrosion resistance and – good handling during replacement of the suspension element
According to DIN EN 12927-6, discard criteria for ropes are defined by the "degree of deterioration at which the rope or the rope end fastening is declared unsuitable for further use“ [1,2,3,4,5,6,7]
Summary
Due to their favourable breaking force-mass ratio HM-HT fibre ropes are an alternative to steel wire ropes, see Figure 1. Other advantages of using HM-HT fibre ropes compared to steel wire ropes with comparable breaking strength are: – increase in lifting masses and lengths, – reduction in the required drive power, – reduction in bending stiffness, – good chemical and corrosion resistance and – good handling during replacement of the suspension element. It is necessary to define discard criteria for HM-HT fibre ropes running over sheaves. According to DIN EN 12927-6, discard criteria for ropes are defined by the "degree of deterioration at which the rope or the rope end fastening is declared unsuitable for further use“ [1,2,3,4,5,6,7]. Knowledge and calculations of rope lifetime are important for the safe operation
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