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- W2000484719 abstract "The directional Young's modulus of transcrystalline isotactic polypropylene grown from the surface of high modulus carbon fibers has been measured by two types of Knoop microindentation experiments. First, static indentation tests were performed and a new data reduction procedure was used to translate the Knoop hardness data into modulus values. The technique assumes that the extent of elastic recovery of a Knoop indent is linearly related to the modulus-to-hardness ratio. The Knoop tip is sensitive to material anisotropy, which allows us to generate data for the different lamellar directions. The hardness and Young's modulus of the transcrystalline layer are found to be higher by up to 30% when the longer diagonal of the probing Knoop tip is perpendicular to the transcrystalline growth direction. Second, continuous indentation tests are performed and a different data reduction technique is used, which leads to similar results. The microindentation approach used here is found to be particularly advantageous for the assessment of Young's modulus of small-scale polymeric regions or when only small polymeric specimens are available." @default.
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- W2000484719 date "1998-10-01" @default.
- W2000484719 modified "2023-09-26" @default.
- W2000484719 title "Directional indentation of transcrystalline polypropylene" @default.
- W2000484719 doi "https://doi.org/10.1002/(sici)1521-4044(199810)49:10/11<588::aid-apol588>3.0.co;2-h" @default.
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