ISO 11093-8:2017 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.
NOTE For the determination of the flexural modulus by the three-point method, see ISO 11093‑7.
Letër dhe karton - Testimi i rokelit mbështjellës të letrës - Pjesa 8: Përcaktimi i frekuencës natyrore dhe moduleve përkulëse me anë të analizave eksperimentale modale
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