Raisutis Renaldas, Kazys Rymantas, Mazeika Liudas, Samaitis Vykintas, Zukauskas Egidijus
Ultrasound Institute of Kaunas University of Technology, K. Barsausko 59, Kaunas Lt-51423, Lithuania.
Materials (Basel). 2016 Jun 6;9(6):451. doi: 10.3390/ma9060451.
Multi-wire ropes are widely used as load-carrying constructional elements in bridges, cranes, elevators, . 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.
多股钢丝绳作为桥梁、起重机、电梯等中的承载结构元件被广泛使用。这种钢丝绳的结构完整性可以通过无损超声技术进行检测。这项工作的目的是研究在相邻钢丝与塑料芯之间存在各种类型声学接触的情况下，超声导波（UGW）沿复合多股钢丝绳的传播情况。利用建模识别了沿多股钢丝绳传播的UGW模式，使用解析和半解析有限元（SAFE）技术计算了频散曲线。为了研究UGW传播的影响，还使用三维有限元方法（FE）模拟了相邻钢丝之间的两种声学接触类型。研究的关键问题是估计相邻钢丝之间的实际边界条件（固体或滑动）以及UGW进入钢丝绳整个横截面的实际穿透深度。因此，为了验证有限元建模的结果，对导波在多股钢丝绳股中的穿透情况进行了实验研究。所进行的建模和实验研究使我们能够选择用于无损检测的UGW的最佳参数。
