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缆索体系作为主要承载部件被现代土木建设广泛应用，其在役使用有效金属承载面积直接关系到整体结构的安全和使用寿命。磁致伸缩导波检测由于具有诸多检测优点在缆索损伤检测方面逐渐成为应用广泛的缆索新型无损检测方法。本文在钢丝缺陷检测的基础上对拉索断丝磁致伸缩导波检测信号特性的进行研究，通过对平行钢丝拉索制作断丝缺陷，详细分析研究不同断丝数量下导波检测信号的特性，得到缺陷回波反射系数与拉索缺陷截面损失率（即断丝根数）的关系，断丝根数越多缺陷回波信号幅值越大，可对拉索金属承载面积进行检测，避免出现重大损失，也为钢丝拉索的损伤磁致伸缩导波无损检测的工程实际应用提供了数据基础。
As the main bearing component, cable system is widely used in modern civil engineering. The effective bearing area in service of the cable system is directly related to the safety and service life of the whole structure. Magnetostrictive guided wave detection has become a widely used new nondestructive testing method for cables due to its many advantages in cable damage detection. In this paper, based on the detection of steel wire defects, the characteristics of magnetostrictive guided wave detection signal of cable broken wire are studied. By analyzing the characteristics of wire detection signal with different broken wires, , Get the relationship between the defect echo reflection coefficient and the loss rate of the cable defect (ie, the number of broken wires). The larger the number of broken wires, the larger the amplitude of the defect echo signal, which can detect the metal bearing area of the cable and prevent it from appearing Great loss, but also provide a data foundation for the actual application of the engineering of the magnetostrictive guided wave nondestructive testing of the steel cable.