中文摘要：

变形是管道的主要失效模式之一，变形检测是保障管道安全运营的重要措施。现有技术，如通径检测、超声检测等用于管道变形检测能够取得较好的效果，但也均有其局限性。为此，通过开展试验研究，探讨利用超声导波技术进行管道变形检测的可行性。导波模态选择轴对称的纵向模态导波L（O，2）。通过在空心铝管中模拟凹陷变形，得到铝管不同凹陷程度时的反射回波。在此基础上，进一步分析变形回波特征与变形区域的联系。结果表明，L（O，2）模态导波对管道凹陷变形敏感，试验系统能够清晰辨识由于管道变形而反射的回波信号；变形回波幅度有效反映了管道的变形程度，且其时间历程能够有效定位管道变形区域所在的轴向位置。超声导波为管道变形检测提供了一种具有潜在吸引力的新型检测技术。

英文摘要：

Deformation is one of the primary failure modes in pipes, and the deformation detection is a critical technology to ensure pipes safety. Existing technologies, such as drift diameter testing and ultrasonic testing, used for pipe deformation detection can get better effect, but also all have their limitations. The feasibility of deformation detection in pipes using ultrasonic guided wave technology is discussed by experimental investigation. For the experiments, the axisymmetric longitudinal mode L（0,2） is selected. The reflected echoes from deformation area with different extent are obtained through simulated local sunken deformations on a hollow aluminum pipe. Further, the relationship between the echoes signal features with reflector is analyzed. The results show that the L（0,2） mode is sensitive to these sunken deformations, and the deformation echoes can be clearly identified. The amplitude of deformation echoes can effectively characterize the extent of pipe deformation, and the time of flight can also locate the deformation area along axial of pipe.