Abstract
As a common approach to nondestructive testing and evaluation, guided wave-based methods have attracted much attention because of their wide detection range and high detection efficiency. It is highly desirable to develop a portable guided wave testing system with high actuating energy and variable frequency. In this paper, a novel giant magnetostrictive actuator with high actuation power is designed and implemented, based on the giant magnetostrictive (GMS) effect. The novel GMS actuator design involves a conical energy-focusing head that can focus the amplified mechanical energy generated by the GMS actuator. This design enables the generation of stress waves with high energy, and the focusing of the generated stress waves on the test object. The guided wave generation system enables two kinds of output modes: the coded pulse signal and the sweep signal. The functionality and the advantages of the developed system are validated through laboratory testing in the quality assessment of rock bolt-reinforced structures. In addition, the developed GMS actuator and the supporting system are successfully implemented and applied in field tests. The device can also be used in other nondestructive testing and evaluation applications that require high-power stress wave generation.
Highlights
A guided wave can propagate in many different waveguide structures, such as plates, rods, pipes, and multilayer structures [1,2]
The device can be used in other nondestructive testing and evaluation applications that require high-power stress wave generation
The excitation method of ultrasonic guided waves plays an important role in the advancement of guided wave testing technology
Summary
A guided wave can propagate in many different waveguide structures, such as plates, rods, pipes, and multilayer structures [1,2]. Those reported in the literature are normally for special purposes, and often require installation For many applications, such as the measurement of the length of embedded rock bolts and road guards, there will be a large number of involved specimens, which requires the inspection to be quick and convenient. Often, it calls for inspection upon contact without using any coupling agent. A new type of guided wave actuator device was developed for stress wave generation with a large output force, based on the giant magnetostrictive (GMS) effect. The device can be used in other NDE applications that require stress wave generation
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