Influences of out-of-plane fiber waviness on the curved beam strength of glass fiber composite laminates

Abstract

In-plane and out-of-plane waviness are inevitable defects in parts that have curved sections made of continuous fiber-reinforced composites. These defects can be located in the micro, meso (ply level) and macro-scale (part level). In this study, an artificial out-of-plane fiber waviness was generated on the outer surface of the curved section of the L-shaped laminates. The fiber waviness generated was characterized experimentally using micrographs taken from the samples. The effect of fiber waviness on curved beam strength and delamination of the samples were determined through bending tests. Also, the effect of fiber waviness on the strain distribution on the curved section was quantified using Digital Image Correlation (DIC) technique.

Keywords

• Fiber waviness,Digital image correlation (DIC),Defects,Bending testing,Glass fibers

Düzlem dışı fiber dalgalanmasının cam elyaf takviyeli tabakalı kompozitlerin kavisli kiriş dayanımı üzerindeki etkileri

Abstract

Düzlem içi ve düzlem dışı dalgalanma, sürekli fiber takviyeli kompozitlerden yapılmış kavisli bölgelere sahip parçalarda kaçınılmaz kusurlardır. Bu kusurlar mikro, mezo (katman seviyesi) ve makro ölçekli (parça seviyesi) olabilir. Bu çalışmada, L şekilli laminatların kavisli bölümünün dış yüzeyinde yapay bir düzlem dışı fiber dalgası oluşturulmuştur. Elde edilen fiber dalgalanmaları, numunelerden alınan mikrogörüntüler kullanılarak deneysel olarak karakterize edilmiştir. Fiber dalgalanmaların kavisli kiriş mukavemeti ve numunelerin delaminasyonuna etkisi eğme testleri ile belirlenmiştir. Ayrıca, fiber dalgalanmasının eğri kesitteki birim şekil değiştirme dağılımına etkisi Sayısal Görüntü Korelasyonu (SGK) tekniği kullanılarak ölçülmüştür.

Keywords

• Fiber dalgalanması,Sayısal görüntü Korelasyonu (SGK),Kusurlar,Eğilme testi,Cam fiberler

References

1. Lightfoot J, Wisnom M, Potter K. "A new mechanism for the formation of ply wrinkles due to shear between plies". Composite Part A, 49, 139-147, 2013.
2. Dodwell T, Butler R, Hunt G. "Out-of-plane ply wrinkling defects during consolidation over an external radius". Composite Science and Technology, 105, 151-159, 2014.
3. Hallender P, Sjölander J, Akermo M. "Forming induced wrinkling of composite laminates with mixed ply material properties; an experimental study". Composite Part A, 78, 234-245, 2015.
4. Sjölander J, Hallander P, Akermo M. "Forming induced wrinkling of composite laminates: a numerical study on wrinkling mechanisms". Composite Part A, 81, 41-51, 2016.
5. Hallander P, Akermo M, Mattei C, Petterson M, Nyman T. "An experimenatal study of mechanisms behind wrinkle development during forming of composite laminates". Composite Part A, 50, 54-64, 2013.
6. Farnand K, Zobeiry N, Poursartip A, Fernlund G. "Micro-level mechanisms of fiber waviness and wrinkling during hot drape forming of unidirectional prepreg composites". Composites Part A, 103, 168-177, 2017.
7. Tam A, Gutowski T. "The kinematics for forming ideal aligned fibre composites into complex shapes". Composites Manufacturing, 1(4), 219-228, 1990.
8. Prodromou AG, Chen J. "On the relationship between shear angle and wrinkling of textile composite preforms". Composite Part A, 28(5), 491-503, 1997.

9. Harrison P, Abdiwi F, Guo Z, Potluri P, Yu W. "Characterising the shear–tension coupling and wrinkling behaviour of woven engineering fabrics". Composite Part A, 43(6), 903-914, 2012.
10. Potter K, Khan B, Wisnom M, Bell T, Stevens J. "Variability, fibre waviness and misalignment in the determination of the properties of composite materials and structures". Composite Part A, 39(9), 1343-1354, 2008.
11. Boisse P, Hamila N, Vidal-Salle E, Dumont F. "Simulation of wrinkling during textile composite reinforcement forming. Influence of tensile, in-plane shear and bending stiffnesses". Composites Science and Technology, 71, 683-692, 2011.
12. Lee J, Hang S, Yu W, Kang T. "The effect of blank holder force on the stamp forming behavior of non-crimp fabric with a chain stitch". Composite Science and Technology, 67(3), 357-366, 2007.
13. Kong H, Mouritz A, Paton R. "Tensile extension properties and deformation mechanisms of multiaxial non-crimp fabrics". Composite Structures, 66(1), 249-259, 2004.
14. Arnold S, Sutcliffe M, Oram W. "Experimental measurement of wrinkle formation during draping of non-crimp fabric". Composites Part A, 82, 159-169, 2016.
15. Ferreira L, Graciani E, Paris F. "Modelling the waviness of the fibres in non-crimp fabric composites using 3D finite element models with straight tows". Composite Structures, 107, 79-87, 2014.
16. Sutcliffe M, Lemanski S, Scott A. "Measurement of fiber waviness in industrial composite components". Composite Science and Technology, 72, 2016-2023, 2012.
17. Wu C, Gu Y, Luo L, Xu P, Wang S, Li M, Zhang Z. "Influences of in-plane and out-of-plane fiber waviness on mechanical properties of carbon fiber composite laminate". Journal of Reinforced Plastics and Composites, 37(13), 877-891, 2018.
18. Zhao C, Xiao J, Li Y, Chu Q, Xu T, Wang B. "An experimental study of the influence of in-plane fiber waviness on unidirectional laminates tensile properties". Applied Composite Materials, 24, 1321-1337, 2017.
19. Christian W, DiazDelaO F, Atherton K, Patterson E. "An experimental study on the manufacture and characteriazation of in-plane fibre-waviness defects in composites". Royal Society Open Science, 5, 1-16, 2018.
20. Mizukami K, Ogi K. "Non-contact visualization of fiber waviness distribution in carbon fiber composites using eddy current testing". Advanced Composite Materials, 27(2), 135-146, 2018.
21. Nair S, Dasari A, Yue C, Narasimalu S. "Failure behaviour of unidirectional composites under compression loading:effect of fiber waviness". Materials, 10(8), 2017, doi:10.3390/ma10080909.
22. Hasiao H, Daniel I. "Elastic properties of composites with fiber waviness". Composites Part A, 27, 931-941, 1996.
23. Cinar K, Ersoy N. "Effect of fibre wrinkling to the spring-in behaviour of L-shaped composite materials". Composite Part A, 69, 105-114, 2015.
24. Wang J, Potter K, Hazra K, Wisnom M. "Experimental fabrication and characterization of out-of-plane fiber waviness in continuous fiber-reinforced composites". Journal of Composite Materials, 46(17), 2041-2053, 2012.
25. Allison B, Evans J. "Effect of fiber waviness on the bending behaviour of S-glass/epoxy composites". Materials and Design, 36, 316-322, 2012.
26. Zhu J, Wang J, Zu L. "Influence of out-of-plane ply waviness on elastic properties of composite laminates under uniaxial loading". Composite Structures, 132, 440-450, 2015.
27. Hörmann S, Adumitroaie A, Viechtbauer C, Schagerl M. "The effect of fiber waviness on the fatigue life of CFRP materials". International Journal of Fatigue, 90, 139-147, 2016.
28. El-Hajjar R, Petersen D. "Gaussion function characterization of unnotched tension behaviour in a carbon/epoxy composite containing localized fiber waviness". Composite Structures, 93, 2400-2408, 2011.
29. Elhajjar R, Shams S. "Compression testing of continuous fiber reinforced polymer composites with out-of-plane fiber waviness and circular notches". Polymer Testing, 35, 45-55, 2014.
30. Nikishkov G, Nikishkov Y, Makeev A. "Finite element mesh generation for composites with ply waviness based on x-ray computed tomography". Advances in Engineering Software, 58, 35-44, 2013.
31. HEXION Specialty Chemicals. "Laminating Resin MGS L 285 Hardeners MGS 285-287 Technical data sheet". http://www.hexion.com/products/technicaldatasheet.aspx?id=30303, (last accessed September 2016).
32. Uzal A, Sonmez FO, Oz FE, Cinar K, Ersoy N. “A composite sandwich plate with a novel core design”. Composite Structures, 193, 198-211, 2018.
33. American Society for Testing and Materials International, "ASTM D6415, Standard test method for measuring the curved beam strength of a fiber-reinforced polymer-matrix composite". West Conshohocken, PA, United States, 2013.