Fracture toughness of PAN-based carbon fibers estimated from strength-mirror size relation |
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Authors: | Kuniaki Honjo |
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Affiliation: | National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan |
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Abstract: | Fracture toughness (KIC) of representative high-strength type PAN (polyacrylonitrile)-based carbon fibers, Torayca™ T300 and T800H, with or without artificial surface defects, were estimated to be ca. 1 MPam1/2 from the tensile strength vs. fracture mirror size relation, assuming a constant crack-to-mirror size ratio. The corresponding critical energy release rate (Γ) was ca. 7.4 J m−2, which was close to the value derived from the reported surface energies for a graphite crystal. Similar KIC values were obtained for the old-type PAN-based carbon fibers from the reported data by the use of the present estimation procedure. |
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Keywords: | A Carbon fibers C Scanning electron microscopy (SEM) D Fracture Mechanical properties |
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