Nondestructive Characterization of Fiber Orientation in Long Fiber Thermoplastic Composites Using Vibration-Based Method
Conference: Publication Date: 16 March 2015Testing Method:
Long Fiber Thermoplastic (LFT) composites are formed by combining reinforcement fibers of 0.5 to 1.5 inch in length with a variety of thermoplastic polymer resin systems. LFTs enable higher mechanical performance than short-fiber equivalents; however, prediction of the effect of processing parameters on the performance of LFTs is less well understood. In discontinuous fiber reinforced composites, the fiber orientation is the most significant variable that determines its mechanical and physical properties. Stiffness and strength are maximized when the fibers are preferentially oriented in a single direction. The proportion and direction of fiber orientation depends strongly on the flow of the material. To characterize and optimize the effects of various processing parameters, an effective method to determine fiber orientation is required. In this paper, LFT glass fiber/polypropylene (PP) (20 wt. %, 14” x 14”) composite plates were processed using Extrusion-Compression Molding (ECM) technique. Samples of the plate were extracted at orientation angles of 0°, 45°, and 90° from the charge squeeze-flow direction. The samples were analyzed using continuous vibration excitation. The Frequency Response Function (FRF) was used to characterize the sample stiffness and damping capacity. The results showed that the 0° samples oriented parallel to the flow direction, exhibited the highest natural frequencies and the lowest damping capacity. The results were validated with destructive mechanical tests to construct an empirical model to predict the effective fiber orientation.
- Chung, D.D.L., Review: Materials for vibration damping. Journal of materials science, 2001. 36(24): p. 5733-5737.
- Akonda, M.H., C.A. Lawrence, and B.M. Weager, Recycled carbon fibre-reinforced polypropylene thermoplastic composites. Composites Part A: Applied Science and Manufacturing, 2012. 43(1): p. 79-86.
- Yang, S.W. and W.K. Chin, Mechanical Properties of Aligned Long Glass FiberReinforced Polypropylene. I: Tensile Strength. Polymer Composites, 1999. 20(2): p. 200-206.
- Advani, S.G. and C.L. Tucker III, A Numerical Simulation of Short Fiber Orientation in Compression Molding. Polymer composites, 1990. 11(3): p. 194-173.
- Folgar, F.P. and C.L. Tucker, Orientation behavior of fibers in concentrated suspensions. Journal of Reinforced Plastics and Composites, 1984. 3(2): p. 98-119.
- Kastner, J., et al., Advanced X-Ray Tomographic Methods for Quantitative Characterisation of Carbon Fibre Reinforced Polymers, in 4th International Symposium on NDT in Aerospace. 2012: Augsburg, Germany.
- Rokhlin, S.I. and W. Wang, Double through-transmission bulk wave method for ultrasouic phase velocity measurement and determination of elastic constants of composite materials. Journal of Acoustical Society of America, 1992. 91(6): p. 3303-3312.
- Kim, J.-W., et al., Study on the Measurement of Fiber Orientation during Press Molding of Long Fiber-Reinforced Thermoplastic Composites Using Counting Method, in 9th International Conference on Fracture & Strength of Solids. 2013: Jeju, Korea.
- Kastner, J., B. Plank, and D. Salaberger, High resolution X-ray computed tomography of fibre- and particle-filled polymers, in 18th World Conference on Nondestructive Testing. April, 2012: Durban, South Africa.
- Thomas Riedel. Evaluation of 3D fiber orientation analysis based on x-ray computed tomography data. in Conference on Industrial Computed Tomography (ICT). 2012. Wels, Austria.
- Ahmed Arabi Hassen, et al. Tracing Defects in Glass Fiber/Polypropylene Composites Using Ultrasonic C-Scan and X-Ray Computed Tomography Methods. in ASNT Annual Conference. October, 2014. Charleston, SC, USA: ASNT.
- Tita, V., J. de Carvalho, and J. Lirani, Theoretical and experimental dynamic analysis of fiber reinforced composite beams. Journal of the Brazilian Socity of Mechanical Science and Engineering, 2003. 25(3): p. 306-310.
- Mallick, P.K., Fiber reinforced composites. 2008, New York, USA: Taylor and Francis Group.
- Fuller, C.R., S.J. Elliott, and P.A. Nelson, Active control of vibration. 1st ed. 1996, San Francisco: Academic Press.
- Singiresu, S.R., Mechanical Vibrations. 5th edition ed. 2010, USA: Prentice Hall.
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