Novel joints developed from partially un-moulded carbon-fibre-reinforced laminates

Abstract

Two novel joints made from partially un-moulded carbon-fibre-reinforced plastic plates were designed to increase the strength of joints between carbon-fibre-reinforced plastic parts. In the partially un-moulded plate, a portion of the fabric stack was moulded with resin while the rest of the fabric stack remained dry. The plate was made using a manufacturing process developed from vacuum-assisted resin-transfer moulding. A new double-lap joint sandwiched a normal carbon-fibre-reinforced plastic plate between the dry fabric layers of a partially un-moulded plate. The other laminated joint overlapped the dry fabric layers of two partially un-moulded plates. Both joints were moulded by resin transfer. Tensile testing indicated that the two novel joints were more than twice as strong as a classical double-lap joint and half as strong as a normal, joint-free carbon-fibre-reinforced plastic plate. Additionally, the joints may potentially be made much stronger by modifying their shapes. In particular, the laminated joint may be made as strong as a normal carbon-fibre-reinforced plastic plate because its strength is determined by the fibre–matrix interface rather than the bondline strength, which is a key factor in determining the strength of a normal carbon-fibre-reinforced plastic plate.

Keywords

Laminate adhesive joints strength scanning electron microscopy resin transfer moulding

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References

Lee

Jeong

Kim

. Development of the anthropomorphic robot with carbon fiber epoxy composite materials. Compos Struct 1993; 25: 313–324.

Wang

Guo

. An investigation on strain/stress distribution around the overlap end of laminated composite single-lap joints. Compos Struct 2009; 89: 589–595.

O’Dwyer

O’Dowd

McCarthy

. Micromechanical investigation of damage processes at composite-adhesive interfaces. Compos Sci Technol 2013; 86: 61–69.

Liu

Zhao

Mehmood

. A modified failure envelope method for failure prediction of multi-bolt composite joints. Compos Sci Technol 2013; 83: 54–63.

Quaresimin

Ricotta

. Stress intensity factors and strain energy release rates in single lap bonded joints in composite materials. Compos Sci Technol 2006; 66: 647–656.

Quaresimin

Ricotta

. Fatigue behaviour and damage evolution of single lap bonded joints in composite material. Compos Sci Technol 2006; 66: 176–187.

Quaresimin

Ricotta

. Life prediction of bonded joints in composite materials. Int J Fatigue 2006; 28: 1166–1176.

Tang

Sridhar

Srikanth

. Static and fatigue failure analysis of adhesively bonded thick composite single lap joints. Compos Sci Technol 2013; 86: 18–25.

Egan

McCarthy

. Static and high-rate loading of single and multi-bolt carbon–epoxy aircraft fuselage joints. Composites Part A 2013; 53: 97–108.

10.

Al-Zubaidy

Al-Mahaidi

Zhao

X-L

. Experimental investigation of bond characteristics between CFRP fabrics and steel plate joints under impact tensile loads. Compos Struct 2012; 94: 510–518.

11.

Fawzia

Al-Mahaidi

Zhao

X-L

. Experimental and finite element analysis of a double strap joint between steel plates and normal modulus CFRP. Compos Struct 2006; 75: 156–162.

12.

Fawzia

Zhao

Al-Mahaidi

. Bond characteristics between CFRP and steel plates in double strap joints. Int J Adv Steel Constr 2005; 1: 17–27.

13.

Jeong

K-W

Park

Y-B

Choi

J-H

. A study on the failure mode and load of the composite key joint. J Compos Mater 2013; 48: 1417–1427.

14.

Zhao

X-L

Zhang

. State-of-the-art review on FRP strengthened steel structures. Eng Struct 2007; 29: 1808–1823.

15.

Katnam

Comer

Stanley

. Characterising pre-preg and non-crimp-fabric composite single lap bonded joints. Int J Adhes Adhes 2011; 31: 679–686.

16.

Feih

Shercliff

. Adhesive and composite failure prediction of single-L joint structures under tensile loading. Int J Adhes Adhes 2005; 25: 47–59.

17.

Kim

K-S

Y-M

Cho

G-R

. Failure prediction and strength improvement of uni-directional composite single lap bonded joints. Compos Struct 2008; 82: 513–520.

18.

Greenhalgh

. Failure analysis and fractography of polymer composites, UK: Woodhead Publishing, 2009.

19.

Dvorak

Zhang

Canyurt

. Adhesive tongue-and-groove joints for thick composite laminates. Compos Sci Technol 2001; 61: 1123–1142.

20.

Kim

Park

Lee

. Smart cure cycle with cooling and reheating for co-cure bonded steel/carbon epoxy composite hybrid structures for reducing thermal residual stress. Composites Part A 2006; 37: 1708–1721.

21.

Sun

Jeyaraman

Sun

. Carbon-fiber aluminum-foam sandwich with short aramid-fiber interfacial toughening. Composites Part A 2012; 43: 2059–2064.

22.

Choi

Lee

. Surface modification of carbon fiber/epoxy composites with randomly oriented aramid fiber felt for adhesion strength enhancement. Composites Part A 2013; 48: 1–8.

23.

Park

Lee

. Strength of double lap joints bonded with carbon black reinforced adhesive under cryogenic environment. J Adhes Sci Technol 2009; 23: 619–638.

24.

da Silva

LFM

Adams

. Techniques to reduce the peel stresses in adhesive joints with composites. Int J Adhes Adhes 2007; 27: 227–235.

25.

Katnam

Dhôte

Young

. Experimental analysis of the bondline stress concentrations to characterize the influence of adhesive ductility on the composite single lap joint strength. J Adhes 2013; 89: 486–506.

26.

Löbel

Kolesnikov

Scheffler

. Enhanced tensile strength of composite joints by using staple-like pins: working principles and experimental validation. Compos Struct 2013; 106: 453–460.

27.

Chen

Jiang

. Tensile properties of a carbon fiber 2D woven reinforced polymer matrix composite in through-thickness direction. J Compos Mater 2012; 46: 3297–3309.