Abstract
In this paper, the manufacturing of carbon fibre reinforced plastic laminates with intentionally, reproducibly and mathematically defined high quality out-of-plane waviness made from unidirectional prepreg material is described. This methodology is employed to manufacture tension test specimens with included controlled out-of-plane ply waviness. The waviness ratio is A/L = 0.09, where A and L denote the wave amplitude and the wavelength, respectively. A number of quality assurance verifications is carried out on these specimens before the tension test. These verifications are to corroborate that the realised graded waviness is consistent with the theoretically defined waviness function. The manufacturing process of these specimens is described in detail. The tension test of the specimens is performed by means of a hydraulic testing device. The force–displacement curves of the tension test are plotted to analyse the material behaviours. Experimental investigations are carried out in conjunction with non-destructive 3D optical measurement methodology to identify the failure mechanisms. The results of quality assurance verifications on the specimens exhibit a perfect matching between the geometrically graded shapes and the theoretical function. Furthermore, the results of tension qualification tests show that all specimens have very similar damage behaviour and the failure events have occurred in the waviness area.
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Hexcel T800/M21.
References
Bradley, D.J., Adams, D.O., Gascoigne, H.E.: Interlaminar strains and compressive strength reductions due to nested layer waviness in composite laminates. Reinf. Plast. Compos. 17(11), 989–1011 (1998)
Adams, D.O., Hyer, M.W.: Effects of layer waviness on the compression strength of thermoplastic composite laminates. Reinf. Plast. Compos. 12, 414–429 (1993)
Mandell, J.F., Samborsky, D.D., Wang, L., Wahl, N.K.: New fatigue data for wind turbine blade materials. ASME J. Solar Energy Eng. 125(4), 506–514 (2003)
El-Hajjir, R.F., Peterson, D.R.: Gaussian function charaterization of unnotched tension behavior in a carbon/epoxy composite containing localized fiber waviness. Compos. Struct. 93(9), 2400–2408 (2011)
Hsiao, H.M., Wooh, S.C., Daniel, I.M.: Fabrication methods for unidirectional and crossply composites with fiber waviness. J. Adv. Mater. 26(2), 19–26 (1995)
Hsiao, H.M., Daniel, I.M.: Elastic properties of composites with fiber waviness. Compos. Part A 27(10), 931–941 (1996)
Hsiao, H.M., Daniel, I.M.: Effect of fiber waviness on stiffness and strength reduction of unidirectional composites under compressive loading. Compos. Sci. Technol. 56(5), 581–593 (1996)
Hsiao, H.M., Daniel, I.M.: Nonlinear elastic behavior of unidirectional composites with fiber waviness under compressive loading. Eng. Mater. Technol. 118, 561–570 (1996)
Hsiao, H.M., Daniel, I.M.: Effect of fiber waviness on the high-strain-rate behavior of composites. Thermoplast. Compos. Mater. 12, 412–422 (1999)
Chun, H., Shin, J., Daniel, I.M.: Effects of material and geometric nonlinearities on the tensile and compressive behavior of composite materials with fiber waviness. 61(1), 125–134 (2001)
Wang, J., Potter, K.D., Hazra, K., Wisnom, M.R.: Experimental fabrication and characterization of out-of-plane fiber waviness in continuous fiber-reinforced composites. Compos. Mater. 46(17), 2041–2053 (2012)
Hexcel.: HexPly M21, publication FTA002 (2007)
Huntsman.: Advanced materials: Araldite LY564/Aradur22962 (2007)
Scotch-Weld 9323-2 B/A.: Structural adhesive. Product data sheet (June) (2002)
Schulz, M., Chrupalla, D., Khattab, IA.: Experimentelle Untersuchung und numerische Modellierung des Einflusses von Faserwelligkeiten auf das Materialverhalten von CFK-Laminaten. In: DLR-internal report. DLR-IB 131-2011/49, 61 pages (2011)
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Khattab, I.Ad., Kreikemeier, J. & Abdelhadi, N.S. Manufacturing of CFRP specimens with controlled out-of-plane waviness. CEAS Aeronaut J 5, 85–93 (2014). https://doi.org/10.1007/s13272-013-0091-y
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DOI: https://doi.org/10.1007/s13272-013-0091-y