Performance of Non-Crimp Fabric Composites in Shear

Abstract:

Experimental results of performance of non-crimp fabric composites are presented in this paper. In order to characterize in-plane shear properties of these composites, tensile and compression tests of [±452]S specimens were carried out. Two directions of loading are considered: warp (Shear warP: SP) and weft (Shear wefT: ST). This corresponds to laminates with the following lay-up: SP = [+45/-45/+45/-45]S; ST = [-45/+45/-45/+45]S. Although both types of laminates are cut from the same plate, mechanical performance in tension is rather different: laminate cut in weft direction exhibit higher shear modulus, shear strength and shear strain at failure than samples cut in warp direction. Fractography showed that different behavior of the materials is caused by much earlier damage initiation and accumulation in SP laminates. Analysis of images obtained from optical microscopy indicated that premature failure is most likely caused by stitches that prevent free rotation of bundles (shear deformation).

• Periodical: Key Engineering Materials (Volume 425)
• Pages: 45-59
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.425.45
• Online since: January 2010
• Authors: Roberts Joffe
• Keywords: Damage, Non Crimp Fabric (NCF), Shear Modulus, Shear Strength

References

[1] D. Mattsson, R. Joffe, J. Varna: Composites: Part B Vol 38 (2007), pp.44-57.

[2] E. Greenhalgh, M. Hiley: Composites: Part A Vol 34 (2003), pp.151-161.

[3] F. Edgren: Physically Based Engineering Models for NCF Composites (PhD thesis, KTH Stockholm, SWEDEN, TRITA-AVE 2006: 17, ISBN 91-7178-316-4).

[4] H. Haberkern: Reinforced Plastics Vol. 50 (2006), pp.28-33.

[5] S.V. Lomova, E.B. Belov, T. Bischoff, S.B. Ghosh, T. Truong Chi, I. Verpoest: Composites: Part A Vol 33 (2002), pp.1171-1183.

DOI: 10.1016/s1359-835x(02)00090-8

[6] F. Edgren, D. Mattsson, L.E. Asp, J. Varna: Compos. Sci. Technol. Vol. 64 (2004), p.675692.

[7] D. Mattsson, R. Joffe, J. Varna: Eng. Fracture Mech. Vol. 75 (2008), pp.2666-2682.

[8] F. Edgren, L.E. Asp, R. Joffe: Compos. Sci. Technol. Vol. 66 (2006), pp.2865-2877.

[9] R. Joffe, D. Mattsson, J. Modniks, J. Varna: Composites: Part A Vol 36 (2005), p.10301046.

[10] Gonzalez, E. Graciani, F. Paris: Compos. Sci. Technol. Vol. 68 (2008), pp.121-131.

[11] T.C. Truonga, M. Vettori, S. Lomov, I. Verpoest: Composites: Part A Vol 36 (2005), p.12071221.

[12] EN 6031 Aerospace series - Fibre reinforced plastics - Test method; determination of inplane shear properties (±45° tensile test).

DOI: 10.3403/30298658u

[13] ASTM D3518/D3518M-94 Standard Test Method for In-Plane Shear Response of Polymer Matrix Composite Materials by Tensile Test of a ±45° Laminate.

DOI: 10.1520/d3518_d3518m-94e01

[14] R. Joffe Effect of Test Methods on Measured Compressive Strength of Polymer Composites, 3rd Nordic Meeting on Materials and Mechanics, 8-11 May 2000, Ålborg (Denmark).