Abstract
Multi-wire ropes are widely used as load-carrying constructional elements in bridges, cranes, elevators, etc. Structural integrity of such ropes can be inspected by using non-destructive ultrasonic techniques. The objective of this work was to investigate propagation of ultrasonic guided waves (UGW) along composite multi-wire ropes in the cases of various types of acoustic contacts between neighboring wires and the plastic core. The modes of UGW propagating along the multi-wire ropes were identified using modelling, the dispersion curves were calculated using analytical and semi-analytical finite element (SAFE) techniques. In order to investigate the effects of UGW propagation, the two types of the acoustic contact between neighboring wires were simulated using the 3D finite element method (FE) as well. The key question of investigation was estimation of the actual boundary conditions between neighboring wires (solid or slip) and the real depth of penetration of UGW into the overall cross-section of the rope. Therefore, in order to verify the results of FE modelling, the guided wave penetration into strands of multi-wire rope was investigated experimentally. The performed modelling and experimental investigation enabled us to select optimal parameters of UGW to be used for non-destructive testing.
Highlights
Multi-wire ropes are widely used in different sectors of industry as load-carrying constructional elements in bridges, cranes, elevators, etc
Due to environmental and operational conditions and fatigue caused by rotational stresses, multiple defects may develop in the internal structure of multi-wire ropes
In the case of multi-wire ropes, the key issues are whether ultrasonic guided waves (UGW) will propagate only in one particular wire/strand, in which it had been excited, or in the whole composite multi-wire rope, and how the penetration of UGW will depend on the excitation method and the type of a mechanical contact between neighboring wires
Summary
Multi-wire ropes are widely used in different sectors of industry as load-carrying constructional elements in bridges, cranes, elevators, etc. One of the promising methods for investigation of non-homogeneities of the internal structure of wire ropes can be application of ultrasonic guided waves (UGW) [1,2,3,4,5,6,7,8,9,10]. A multi-wire steel rope to be investigated using ultrasound by itself is a complex composite structure in which multiple reflections, scattering,using and the presencebyofitself multiple wave modes of UGW. Of UGW used for non-destructive testing of the particular objects are necessary to be investigated and selected. As an object of investigation, a multi-wire steel rope consisting of six strands, each with the diameter of 11.15 mm, had been selected. 1. In order to simplify further analysis the assumption was made thatstructure the of rope consists straight strands.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
