Mesomechanical Model for Fibre Composites

摘要

Carbon fibre interfaces with epoxy resins have been examined using the pull outmethod. This method can now be reliably and reproducibly used to measured the bond strength. Shear strengths can be very high, up to nearly 150 MPa in individual experiments, with average values for 50 or more tests of up to 100 MPa. The strengths are little different for Hercules AS1, AS2 and AS4. The sizing appears to have little effect (but this needs to be confirmed). The strengths observed are up to three times the shear strength of the polymer. Carbon and glass interfaces with thermoplastics (polyethylene and nylon) can also be measured using this method. Results here are up to four times the estimated shear strength of the polymer. To explain the high results an equivalent work of fracture is involved. This has never exceeded 300 Jm-2, indicating that the interphases are quite brittle. Keywords: Fibre reinforces polymers, Composites. (js)