Abstract
Ultrasonic non-destructive testing is an effective means of examining objects without destroying them. Among such testing, ultrasonic nonlinear evaluation is used to detect micro-damage, such as corrosion or plastic deformation. In terms of micro-damage evaluation, the data that comes from amplitude comparison in the frequency domain plays a significant role. Its technique and parameter are called ultrasonic nonlinear technique and nonlinearity. A certain portion of nonlinearity comes from the equipment system, while the other portion of nonlinearity comes from the material. The former is system nonlinearity, while the latter is material nonlinearity. System nonlinearity interferes with interpretation, because its source is not from the material. In this study, in order to minimize system effects, a mixing technique is implemented. To use the large area inspection ability of the guided wave, the main research issue in this paper is focused on the guided wave mixing technique. Moreover, several bulk wave mixing theory equations become good concepts for guided wave mixing theoretical study, and the conventional nonlinear technique and guided wave mixing experimental results are compared in this study to confirm the reliability. This technique can play an important role in quantitatively discriminating fine damage by minimizing the nonlinearity of the equipment system.
Highlights
Ultrasonic waves and radiation are normally used for non-destructive testing
Based on the nonlinearity derived from the second harmonic component, many research results have been widely studied for micro-damage assessments [1,2,3]
This means that reducing system nonlinearity could increase the accuracy of the results
Summary
In the case of ultrasonic testing, the velocity, time, and distance of ultrasonic waves help the user to find defects. These simple parameters do not satisfy all evidence for evaluating micro-damage in a material, such as damage from corrosion, plastic deformation, or microstructure variation. Based on the nonlinearity derived from the second harmonic component, many research results have been widely studied for micro-damage assessments [1,2,3]. Even though nonlinearity indicates good micro-damage assessment sensitivity, it usually shows relative results. Nonlinearity influenced by the system acts as an error This means that reducing system nonlinearity could increase the accuracy of the results. One of the few techniques that can reduce system nonlinearity is the wave mixing technique [4]
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