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Characterizing Mode I Fatigue Delamination of Composite Materials

by Roderick H. Martin, Analytical Services and Materials, Hampton, United States,



Document Type: Proceeding Paper

Part of: Mechanics Computing in 1990's and Beyond

Abstract:

Evaluation of two techniques to characterize fatigue delamination using the double cantilever beam (DCB) specimen are presented. The two techniques were the delamination growth onset (G-N) method and the delamination growth the arrest (da/dN-G) method. Two glass/epoxy systems, S2/SP250 and S2/CE9000, were tested at R=0.1 and R=0.5. The values of strain energy release rate threshold, ?G_Ith for no onset of delamination growth until one million cycles were compared with the values of ?G_I at delamination arrest. The values of ?G_I at delamination arrest were consistently higher than the values of ?G_Ith. The ?G_I results were normalized by the value of mode I Interlaminar fracture toughness at the corresponding ?a and gave values at delamination arrest closer to the ?G_Ith/G_Ic values obtained from the G-N technique. However, this normalization does not represent a generic materials characterization technique and does not allow for delamination onset predictions at loads above the threshold.

Subject Headings: Delaminating | Materials characterization | Composite materials | Composite beams | Material mechanics | Fatigue (material) | Construction materials

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