4 March 2015 Research on inner defect detection of pressure vessels with digital shearography
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Proceedings Volume 9302, International Conference on Experimental Mechanics 2014; 93023J (2015) https://doi.org/10.1117/12.2083822
Event: International Conference on Experimental Mechanics 2014, 2014, Singapore, Singapore
Abstract
The digital shearograghy method has shown strong cutting edge in the whole-field measurement, the simple optical road, the easy modulation and the low demand for environment. Also the phase-shifting method which is used in digital shearograghy can improve the precision of the measurement greatly. And therefore these methods are used in Non Destructive Testing (NDT) widely. In this paper, the inner defect detection of pressure vessels was studied via the theoretical mode, the numerical simulation (finite element method) and the experiment in which the digital shearograhy and phase-shifting method was used. The first-order derivative maximum of the out-of-plane displacement in the defect which have different diameters and depths under the various pressures were obtained and compared with each other. And the results obtained with the three different means mentioned above are consistent. According to the maximum number of 1st derivation, the defect of pressure vessels is detected when the proportion of the diameter and the thickness of defect is the more than 9. In addition, the phase diagrams and the out-of-plane displacement gradients were also gained. Based on the phase diagram, it is easily determined whether the defect exists, and the defect relative size can be qualitatively obtained. It is proved that there is feasibility and advantage of the digital shearograghy when it is used in inner defect detection of pressure vessels. This study can provide a new method that is able to detect inner defects of pressure vessels and widen the application of the digital shearograghy.
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X. Feng, X. Feng, X. Y. He, X. Y. He, Ch. P. Tian, Ch. P. Tian, H. H. Zhou, H. H. Zhou, } "Research on inner defect detection of pressure vessels with digital shearography", Proc. SPIE 9302, International Conference on Experimental Mechanics 2014, 93023J (4 March 2015); doi: 10.1117/12.2083822; https://doi.org/10.1117/12.2083822
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