The development of a method for the measurement of delamination in unsaturated polyester resin laminates is described. A laminate is wedge-opened in a tensile testing machine, and the load at break is taken as a measurement for delamination. The results are compared with the delamination measured by the degree of fibre pull-out on the surface of laminates opened by hand. By testing a large sample series with both methods it could be shown by statistical analysis that wedge-opening in a tensile testing machine is more sensitive towards differences in laminate properties, and therefore gives more reliable results.
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References
1.
Standard Test Method for Apparent Interlaminar Shear Strength of Parallel Fiber Composites by Short-Beam Method, ASTM D 2344, American Society for Testing and Materials, Philadelphia, PA, USA (1984).
2.
WhitneyJ.M., “Experimental Characterization of Delamination Fracture”, in: Interlaminar Response of Composite Materials, ed. PaganoN.J., Elsevier Science Publishers, Amsterdam, Netherlands (1989).
3.
SuzukiY., MaekawaZ., HamadaH., KibuneM., HojoM. and IkutaN., J. Mater. Sci.27, (1992), 6782–6790.
Standard Test Method for Strength Properties of Adhesives in Cleavage Peel by Tension Loading, ASTM D 3807-79, American Society for Testing and Materials, Philadelphia, PA, USA (1979).
HeilemanH. and CopeD.E., SPI Composites Institute 41st Annual Conference, Session 26-D, Atlanta, GA, USA (1986).
8.
RusselR.F., SPI Composites Institute 36th Annual Conference, Session 19-E, Washington D.C., USA, (1981).
9.
NylanderP., SPI Composites Institute 34th Annual Conference, Session 6-B, New Orleans, LA, USA, (1979).
10.
Report by Scott Bader & Co., Wollaston, Leics, UK, Reinf. Plast.24, (1980), 46–47.
11.
Assessment of Degree of Interlaminar Adhesion in Polyester Resin Glass Fibre Laminates, Publication 302, British Plastics Federation, London, United Kingdom (1984).
12.
BoxG.E.P., HunterW.G. and HunterJ.S., Statistics for Experimenters, John Wiley & Sons, New York, USA (1978).
