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ISO 11093-8:1997 Paper and board -- Testing of cores -- Part 8: Determination of natural frequency and flexural modulus by experimental modal analysis
standard by International Organization for Standardization, 12/01/1997
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This part of ISO 11093 specifies a method for the determination of the flexural modulus by using experimentally measured natural frequencies in the free-free mode of transverse vibration of cylindrical paper and board cores, which meet the following criteria:
internal diameter: 50 mm to 350 mm;minimum wall thickness: 0,02 internal diameter or not less than 2,0 mm;minimum length of core: 8 internal diameter.