Mode I interlaminar fracture behavior and mechanical properties of CFRPs with nanoclay-filled epoxy matrix |
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| Affiliation: | 1. Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;2. Department of Civil Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;3. National Engineering and Scientific Commission, P.O. Box 2801, Islamabad, Pakistan;1. International Islamic University Malaysia, Malaysia;2. DRIVE EA1859, Univ. Bourgogne Franche-Comté, F-58000 Nevers, France;3. Université de Toulouse ICA (Institut Clément Ader), CNRS UMR 5312, UPS, France;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China;1. Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia;2. Department of Mechanical Engineering, École Polytechnique, P.O. Box 6079, Station Centre Ville, Montréal, Qc, H3C 3A7, Canada |
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| Abstract: | The mechanical properties and fracture behavior of nanocomposites and carbon fiber composites (CFRPs) containing organoclay in the epoxy matrix have been investigated. Morphological studies using TEM and XRD revealed that the clay particles within the epoxy resin were intercalated or orderly exfoliated. The organoclay brought about a significant improvement in flexural modulus, especially in the first few wt% of loading, and the improvement of flexural modulus was at the expense of a reduction in flexural strength. The quasi-static fracture toughness increased, whereas the impact fracture toughness dropped sharply with increasing the clay content.Flexural properties of CFRPs containing organoclay modified epoxy matrix generally followed the trend similar to the epoxy nanocomposite although the variation was much smaller for the CFRPs. Both the initiation and propagation values of mode I interlaminar fracture toughness of CFRP composites increased with increasing clay concentration. In particular, the propagation fracture toughness almost doubled with 7 wt% clay loading. A strong correlation was established between the fracture toughness of organoclay-modified epoxy matrix and the CFRP composite interlaminar fracture toughness. |
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