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A Method to Improve Detection of Release Fabric in Fiber Reinforced Composite by Through Transmission Ultrasound


Title: A Method to Improve Detection of Release Fabric in Fiber Reinforced Composite by Through Transmission Ultrasound

Authors: Gary S. LeMay, Zachary T. Kral, Enkhsaikhan Boldsaikhan

DOI: 10.33599/nasampe/c.23.0086

Abstract: Subsurface defect detection depends on several factors, such as the defect type, the defect location and geometry, the inspection method, the material to be inspected, impurities, and so on. Fiber Reinforced Composite (FRC) is a ply-by-ply manufacturing process that utilizes several materials such as, bagging film, breather/bleeder cloth, parting film, release fabric, and wire systems. Such materials can be inadvertently left inside the final product, categorized as foreign. Foreign materials lead to subsurface defects that can cause premature failure and must be detected with Nondestructive Inspection (NDI). Ultrasound NDI is an industry technique used for subsurface defect detection in FRC. Ultrasound NDI techniques are fundamentally based on acoustic impedance properties and time-based resolution. Certain applications require Through Transmission Ultrasound (TTU) – where sound is transmitted from one sensor and received by another. Received TTU signals are based on differences in amplitude, as defect detection relies on dissimilarities in signal strength compared to the defect free baseline. Changes in amplitude are a function of acoustic impedance by way of transmission coefficients. The acoustic impedance between certain foreign materials and baseline FRC are similar, resulting in minimal differences in signal strength, equally affecting detection. This study was conducted to develop a process to improve the detection of release fabric defects in FRC by TTU. The original signals comparing the baseline to the release fabric defect were associated in terms of peak amplitude, arithmetic mean, and standard deviation. The signals were converted from time to the frequency domain by Fast Fourier Transform (FFT). The root mean square (RMS) was then calculated based on the frequency components for comparison. Finally, confidence intervals were calculated to establish thresholds for both the amplitude and RMS values. The result is a method to improve detection of release fabric defects in FRC laminate by TTU. Other physical factors that affect foreign material detectability remain a field of study.

References: [1] F. C. Campbell, ""Introduction to composite materials,"" Structural composite materials , vol. 1, pp. 1-26, 2010. [2] M. J. H. a. A. S. K. P. D. Soden, ""Lamina properties, Lamina properties, lay-up configurations and loading conditions for a range of fibre reinforced composite laminates,"" Failure criteria in fibre-reinforced-polymer composites, pp. 30-51, 2004. [3] R. a. K. K. S. Shrivastava, ""Interlaminar fracture toughness characterization of laminated composites: a review,"" Polymer Reviews , vol. 60, no. 3, pp. 542-593, 2020. [4] Q. T. K. G. K. S. Pervaiz S, ""3D Printing of Fiber-Reinforced Plastic Composites Using Fused Deposition Modeling: A Status Review,"" Materials, vol. 14, no. 16, 2021. [5] D. G.-N. & M. N. Askari, ""Effects of Vertically Aligned Carbon Nanotubes on Shear Performance of Laminated Nanocomposite Bonded Joints,"" Science and Technology of Advanced Materials, pp. 1-10, 2010. [6] N. a. A. B. R. Reynolds, ""High‐volume thermoplastic composite technology for automotive structure,"" Advanced composite materials for automotive applications: structural integrity and crashworthiness, pp. 29-50, 2013. [7] G. Gardiner, ""Out-of-autoclave prepregs: Hype or revolution,"" Composites World, 1 January 2011. [Online]. Available: [Accessed 2017]. [8] J. S. T. a. R. B. Ajit D. Kelkar, ""Introduction to low cost manufacturing of composite laminates,"" in American Society for Engineering Education Annual conference & Exposition, 2003. [9] ""Bagging Materials,"" Pacific Coast Composites, 2022. [Online]. Available: [Accessed 30th Feburary 2022]. [10] J. Sloan, "Out-of-autoclave processing: %lt;1% void content," Composites World, 1 June 2015. [Online]. Available: [Accessed 2017]. [11] ASTME2580-17, Standard Practice for Ultrasonic Testing of Flat Panel Composites and Sandwich Core Materials Used in Aerospace Applications1, West Conshohocken, PA: ASTM International, November 1, 2017. [12] L. H. Z. W. L. C. a. W. O. W. Yam, ""Numerical analysis of multi-layer composite plates with internal delamination,"" Computers & Structures, vol. 82, no. 7-8, pp. 627-637, 2004. [13] T. M. L. A. D. C. G. V. P. a. G. C. D’orazio, ""Automatic ultrasonic inspection for internal defect detection in composite materials,"" NDT & e International, vol. 41, no. 2, pp. 145-154, 2008. [14] B. P. H. Y. K. J. J. X. L. a. N. L. Wang, ""Ultrasonic Testing of Carbon Fiber-Reinforced Polymer Composites,"" Journal of Sensors, 2022. [15] T. E. B. a. N. G. T. Hasiotis, ""Application of ultrasonic C-scan techniques for tracing defects in laminated composite materials,"" Strojniški vestnik-Journal of Mechanical, vol. 57, no. 3, pp. 192-203, 2011. [16] ""Ultrasound Basics,"" Iowa State University Center for Nondestructive Evaluation, [Online]. Available: [Accessed 30 02 2022]. [17] Y. B.-C. e. a. P.G. Kenny, ""Basic Inspection Methods (Pulse-Echo and Transmission Methods),"" Nondestructive Evaluation and Quality Control, Vols. Vol 17, ASM Handbook, ASM International, p. 231–277, 1989. [18] R. E. Berg, ""Sound,"" 8 September 2022. [Online]. Available: [Accessed 12 November 2022]. [19] M. a. O. S. Kanerva, ""The peel ply surface treatment for adhesive bonding of composites: A review,"" International Journal of Adhesion and Adhesives, vol. 43, pp. 60-69, 2013. [20] G. S. a. D. A. LeMay, ""A new method for ultrasonic detection of peel ply at the bondline of out-of-autoclave composite assemblies,"" Journal of Composite Materials, vol. 53.2, pp. 245-259, 2019. [21] ""Material Sound Velocities,"" [Online]. Available: [Accessed 10 May 2023]. [22] Z. T. Kral, ""Development of a decentralized artificial intelligence system for damage detection in composite laminates for aerospace structures,"" December 2013. [Online]. Available: [Accessed 15 May 2023]. [23] G.-M. a. D. M. H. Zhang, ""Contemporary ultrasonic signal processing approaches for nondestructive evaluation of multilayered structures,"" Nondestructive testing and evaluation , vol. 27.1, pp. 1-27, 2012. [24] A. e. a. Abbate, ""Signal detection and noise suppression using a wavelet transform signal processor: application to ultrasonic flaw detection,"" IEEE transactions on ultrasonics, ferroelectrics, and frequency control, vol. 44.1 , pp. 14-26, 1997. [25] M. Viswanathan, ""Significance of RMS (Root Mean Square) value,"" 2023 GaussianWaves • Built with GeneratePress, 23 July 2015. [Online]. Available: [Accessed 15 May 2023]. [26] E. C. E. M. L. A. M. & A. W. J. Boldsaikhan, ""The use of neural network and discrete Fourier transform for real-time evaluation of friction stir welding.,"" Applied Soft Computing, vol. 11, no. 8, pp. 4839-4846, 2011. [27] ""Parseval's Theorem,"" Wolfram Research, 23 May 2023. [Online]. Available: [Accessed 30 May 2023]. [28] J.-i. a. M. A. Kushibiki, ""Diffraction effects on bulk-wave ultrasonic velocity and attenuation measurements,"" The Journal of the Acoustical Society of Americ, vol. 108.2, pp. 564-573, 2000.

Conference: CAMX 2023

Publication Date: 2023/10/30

SKU: TP23-0000000086

Pages: 17

Price: $34.00

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