Revision as of 08:56, 4 March 2021

Abstract

Density is a decisive factor in determining one of the most important advantages of flax fiber-reinforced polymer (FFRP) composites, i.e. their relatively low weight leading to high specific properties. As a fundamental physical property of composites, density enters in many engineering design and quality control calculations and its value is a determining factor for several applications. Especially, we need precise material properties including density so as to develop efficient numerical models to these materials. In this work, three density measurement methods were evaluated and compared: Helium-gas pycnometry and Archimedes with two different immersing liquids, water and ethanol. The results show that Helium-gas pycnometry and Archimedes with ethanol gave similar and repeatable results, whereas using water resulted in much lower values. The density values were all in the range of reported values. However, Helium-gas pycnometry or Archimedes using ethanol are recommended for more precision in measuring the density of FFRP composites.

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References

[1] Faruk, O., et al., Biocomposites reinforced with natural fibers: 2000–2010. Progress in Polymer Science

(2012) 37(11): 1552-1596.

[2] Yan, L., N. Chouw, and K. Jayaraman, Flax fibre and its composites–A review. Composites Part B:

Engineering (2014) 56: 296-317.

[3] Zhu, J., et al., Recent development of flax fibres and their reinforced composites based on different polymeric

matrices. Materials (2013) 6(11): 5171-5198.

[4] Yan, L., N. Chouw, and X. Yuan, Improving the mechanical properties of natural fibre fabric reinforced epoxy

composites by alkali treatment. Journal of Reinforced Plastics and Composites (2012) 31(6): 425-437.

[5] Van de Weyenberg, I., et al., Improving the properties of UD flax fibre reinforced composites by applying an

alkaline fibre treatment. Composites Part A: Applied Science and Manufacturing (2006) 37(9): 1368-1376.

[6] Zhang, Y., et al., Tensile and interfacial properties of unidirectional flax/glass fiber reinforced hybrid

composites. Composites Science and Technology (2013) 88: 172-177.

[7] Arbelaiz, A., et al., Flax fiber surface modifications: effects on fiber physico mechanical and

flax/polypropylene interface properties. Polymer composites (2005) 26(3): 324-332.

[8] El Sawi, I., et al., Influence of the Manufacturing Process on the Mechanical Properties of Flax/Epoxy

Composites. Journal of Biobased Materials and Bioenergy (2014) 8(1): 69-76.

[9] Charlet, K., et al., Mechanical properties of flax fibers and of the derived unidirectional composites. Journal

of Composite Materials (2010) 44(24): 2887-2896.

[10] Lefeuvre, A., A. Bourmaud, and C. Baley, Optimization of the mechanical performance of UD flax/epoxy

composites by selection of fibres along the stem. Composites Part A: Applied Science and Manufacturing

(2015) 77: 204-208.

[11] Netravali, A.N. and S. Chabba, Composites get greener. Materials Today (2003) 6(4): 22-29.

[12] Zini, E. and M. Scandola, Green composites: An overview. Polymer Composites (2011) 32(12): 1905-

[13] Wambua, P., J. Ivens, and I. Verpoest, Natural fibres: can they replace glass in fibre reinforced plastics?

composites science and technology (2003) 63(9): 1259-1264.

[14] Gurunathan, T., S. Mohanty, and S.K. Nayak, A review of the recent developments in biocomposites

based on natural fibres and their application perspectives. Composites Part A: Applied Science and

Manufacturing (2015) 77: 1-25.

[15] Summerscales, J., et al., A review of bast fibres and their composites. Part 1–Fibres as reinforcements.

Composites Part A: Applied Science and Manufacturing (2010) 41(10): 1329-1335.

[16] Rude, T.J., L.H. Strait, and L.A. Ruhala, Measurement of Fiber Density by Helium Pycnometry. Journal

of Composite Materials (2000) 34(22): 1948-1958.

[17] Amiri, A., et al., Standard density measurement method development for flax fiber. Industrial Crops and

Products (2017) 96: 196-202.

[18] Mahmoudi, S., et al., Experimental and numerical investigation of the damping of flax-epoxy composite

plates. Composite Structures (2018) 208: 426-433.

[19] ASTM, D4892-Standard Test Method for Density of Solid Pitch (Helium Pycnometer Method).

[20] ASTM, D792- Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by

Displacement.

[21] Madsen, B., Properties of plant fibre yarn polymer composites. Technical University of Denmark, (2004).

[22] Madsen, B. and H. Lilholt, Physical and mechanical properties of unidirectional plant fibre compositesan

evaluation of the influence of porosity. Composites Science and Technology (2003) 63(9): 1265-1272.

[23] Truong, M., et al., A comparative study on natural fibre density measurement. The Journal of The Textile

Institute (2009) 100(6): 525-529.

[24] Le Gall, M., et al., Recommended flax fibre density values for composite property predictions. Industrial

Crops and Products (2018) 114: 52-58.