Details

Autor(en) / Beteiligte

• Bonhomme, J.
• Viña, J.
• Argüelles, A.
• Viña, I.
• Mollón, V.

Titel

Influence of the Matrix Toughness in Carbon-Epoxy Composites Subjected to Delamination under Modes I, II, and Mixed I/II

Ist Teil von

• Mechanics of advanced materials and structures, 2013-09, Vol.20 (8), p.679-686

Ort / Verlag

Taylor & Francis Group

Erscheinungsjahr

2013

Quelle

Taylor & Francis

Beschreibungen/Notizen

• In this work, the fracture behavior under modes I, II, and mixed mode I/II has been studied for two different AS4 carbon fiber epoxy laminates. One of the laminates was produced with a Hexcel 3501-6 epoxy resin while the other was laminated with a tougher modified Hexcel 8552 epoxy resin. Both laminates were experimentally tested in modes I, II, and mixed I/II with different mixity ratios by means of DCB (double cantilever beam), ENF (end notch flexure), and MMB (mixed mode bending) specimens, respectively. Finite element modeling (FEM) was used in order to analyze modes I, II, and mixed I/II and to compare experimental and numerical results. The modified 8552 resin matrix presented the best behavior in mode I and mixed mode I/II as the critical energy release rate was higher than that for the 3501-6 matrix composites. In mode II, the best performance was reached for the 3501-6 matrix laminates. It was also found that the critical energy G c and the scatter increased as the mode ratio G II /G c increased. Finally, experimental and numerical results showed a good agreement as the differences obtained from both procedures were generally lower than 10%.