Nonlinear elastic response of pan based carbon fiber to tensile loading and relations to microstructure

نویسندگان

چکیده

Abstract In this study, wide- and small-angle scattering (WAXS, SAXS) are used to analyze the structure of polyacrylonitrile (PAN) carbon fiber. Wide angle is identify lattice parameters such as d-spacings, stacking height crystalline planes (Lc), average crystallize size various other features (void content, degree graphitization). Small results show orientation distributions pores/amorphous regions. Several analysis techniques were applied small ensure accuracy. XRD Data collected correlated single fiber mechanical properties a model developed. Fiber modulus heavily related crystallite dimensions well pore structure. Authors hypothesize that non-linear elasticity observed in direction fibers arises from elastic planar motion within turbostratic carbon. As regions grow expand, improves lowering barriers for (002) quasi-graphene plane motion. This miniscule can lead large nonlinear response tensile loading especially high crystallinity underlying deformation mechanics addressed considering transverse-isotropy turbostatic graphite crystals.

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ژورنال

عنوان ژورنال: Carbon

سال: 2021

ISSN: ['0008-6223', '1873-3891']

DOI: https://doi.org/10.1016/j.carbon.2021.03.012