Chen Xiaohui, Xu Jiang, Li Yong, Wang Shenghuai
School of Mechanical Engineering, Hubei University of Automotive Technology, Shiyan 442002, China.
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Materials (Basel). 2023 Jul 25;16(15):5215. doi: 10.3390/ma16155215.
Steel strands are widely used in structures such as bridge cables, and their integrity is critical to keeping these structures safe. A steel strand is under the working condition of an alternating load for a long time, and fatigue damage is unavoidable. It is necessary to find characteristic parameters for evaluating fatigue damage. In this study, nonlinear coefficients and attenuation coefficients were employed to evaluate fatigue damage based on magnetostrictive guided wave testing. Unlike pipe and steel wire structures, there is a phenomenon of a notch frequency when guided waves propagate in steel strands. The influence of the notch frequency on the nonlinear coefficient and attenuation coefficient is discussed. The relationship between the nonlinear coefficient, attenuation coefficient, and cyclic loading times was obtained through experiments. The amplitudes of the nonlinear coefficient and attenuation coefficient both increased with the increase in cyclic loading times. The experiments also showed the effectiveness of using these two characteristic parameters to evaluate fatigue damage.
钢绞线广泛应用于桥梁缆索等结构中，其完整性对于确保这些结构的安全至关重要。钢绞线长期处于交变载荷的工作条件下，疲劳损伤不可避免。有必要找到评估疲劳损伤的特征参数。在本研究中，基于磁致伸缩导波检测，采用非线性系数和衰减系数来评估疲劳损伤。与管道和钢丝结构不同，导波在钢绞线中传播时存在切口频率现象。讨论了切口频率对非线性系数和衰减系数的影响。通过实验得到了非线性系数、衰减系数与循环加载次数之间的关系。非线性系数和衰减系数的幅值均随循环加载次数的增加而增大。实验还表明了使用这两个特征参数评估疲劳损伤的有效性。
