Dear all, what is the difference between delamination and debonding in composite materials? Are they the same?

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Saman Ghahri

Dear Ng Lin Feng,

Delamination is one of the most important factors In the layered composites like plywood and glulam. Also, delamination appears in the moisture sensitive adhesives and structural layered composites with hygroscopic properties (like wood based composites) as well. Indeed debonding causes delamination of these composites in the water or humid conditions. So, they are not same! debonding can occur in all types of glued composite materials. but delamination just happened in the layered composites. For example, there is an American national standard for plywood delamination. Please check it: ANSI/HPVA HP-1 (2004).

Regards

Saman

Ng Lin Feng

Dear all, Thank you for your feedback.

That means delamination is impossible in randomly short fibre reinforced composite. We need to define that kind of failure as fibre-matrix debonding. Am I right?

I think Yes. You should find a suitable testing method for evaluating the bonding strength. there are the standards for evaluating the internal bonding (IB) strength in wood (particle or fiber) based composites. if you just want to evaluate the mechanical properties of adhesives you can use the TMA (thermo-mechanical analysis) and ABES (Automated Bonding Evaluation System) test.

Anyway, delamination is related to debonding in some cases because delamination in laminated materials is resulted from debonding. So, debonding has a wide range compared to delamination.

Thanks for sharing.