Rate sensitivity of mode II interlaminar fracture toughness in graphite/epoxy and graphite/PEEK composite materials |
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| Affiliation: | 1. Research Center for the Mechanics of Materials, Solids and Structures, Department of Aerospace Engineering and Engineering Mechanics University of Texas, Austin, TX 78712, United States;2. Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409, United States |
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| Abstract: | This paper presents results from an experimental study of the effect of rate on the Mode II interlaminar fracture toughness, GIIC, in graphite/PEEK (APC-2) and graphite/epoxy (AS4/3501-6) laminates. The end notched flexure test geometry was employed for Mode II experiments which were performed at room temperature over a range of crosshead speeds from 4·2 × 10−6 to 9¢2 × 10−2 mc−1. The APC-2 material exhibited ductile crack growth at low rates and brittle crack growth at high rates. The change in fracture mechanism resulted in a decrease in GIIC from 1·0 to 0·40 kJ m−2 at the upper range of test rates. The AS4/3501-6 material exhibited brittle crack growth at all rates. The GIIC values also decreased at higher test rates from 0·46 to 0·06 kJ m−2. |
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