Publication: Publication Date: 2 January 2020Testing Method:
A Framework for Computational Nondestructive Evaluation of Degraded Composites with Microscale Discontinuities
Ultrasonic nondestructive evaluation (NDE) of composites is performed to detect and quantify material damages. The estimation of degraded material properties is not generally performed using NDE. However, if successfully done, it has the potential to illuminate the progressive failure models for estimation of composite failure and predict remaining useful life more accurately. It could be done through multiple experiments with controlled degraded material properties due to microscale discontinuities to understand the signals and use that understanding for estimation of equivalent material properties. However, it is not practical to perform all the possible experiments with various damage scenarios and geometries. An alternate way is to obtain a physics-based under-standing of the perturbation of the ultrasonic wavefield. Through virtual experiments, signals could be evaluated in the presence of microscale discontinuities compared to the pristine materials as fast as possible. In this paper, a framework with computational NDE (CNDE) is proposed to visualize the effect of microscale discontinuities on an ultra-sonic wavefield to generate a database to compute the ultrasonic wavefield in degraded composites. The framework will help clarify the effect of micro discontinuities on the ultrasonic probing energy. Distributed point source method (DPSM) is a newly developed CNDE approach used herein to boost computational efficiency, which requires elastody-namic Green’s function in the material. Materials with micro discontinuities show the effect on the Green’s function and thus they affect the computed ultrasonic wavefield in CNDE. To obtain the degraded material properties for the CNDE, representative volume elements (RVEs) are studied to understand the effect of distributed discontinuities on the effective constitutive properties. Finally, the acquired effective properties were utilized to calculate perturbed Green’s function and consequently, the affected CNDE response. With the available technology at this time, it is challenging to validate a high-frequency NDE problem in the time domain; however, frequency domain results are presented in this paper and the effect of microscale discontinuities is enumerated.
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