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Starch Impregnation Effect of Testliner Paper on Stiffness of Honeycomb Panels with Slender Cells

Type
Journal article
Language
English
Date issued
2022
Author
Słonina, Michał
Smardzewski, Jerzy 
Faculty
Wydział Leśny i Technologii Drewna
Journal
Drvna Industrija
ISSN
0012-6772
DOI
10.5552/drvind.2022.0024
Web address
https://hrcak.srce.hr/en/clanak/406559
Volume
73
Number
3
Pages from-to
327-334
Abstract (EN)
The study aimed to determine the effect of impregnation with modified starch of recycled paper (Testliner) on elasticity constants of slender core cells and the influence on the elasticity constants and strength of honeycomb with facings made of thin particleboards. The experimental tests were carried out on beams subjected to three-point bending. It was shown that slender hexagonal cells significantly differentiate their elastic properties and elastic properties of honeycomb panels in the main directions of orthotropy. Impregnation of the Testliner paper with modified starch reduces the values of the modulus of elasticity of the cells by about 8.8 % and reduces the values of the modulus of elasticity of the honeycomb panels by at least 6.9 %. Analytical solutions that do not take into account the structural form of the core cannot be used to calculate the modulus of elasticity of sandwich panels with hexagonal core cells.
Abstract (other)
Cilj predstavljenog istraživanja bio je utvrditi učinak impregnacije recikliranog papira (testliner papira) modificiranim škrobom na konstante elastičnosti uskih ćelija papirne jezgre i učinak na konstante elastičnosti papirnog saća obostrano obloženoga tankim pločama ivericama. Eksperimentalna su ispitivanja provedena na uzorcima podvrgnutima savijanju u tri točke. Pokazalo se da vitke heksagonalne ćelije u glavnim smjerovima ortotropije znatno diferenciraju svoja svojstva elastičnosti, kao i svojstva elastičnosti ploča s jezgrom od papirnog saća. Impregnacija testliner papira modificiranim škrobom smanjuje vrijednosti modula elastičnosti ćelija za otprilike 8,8 %, ali i vrijednosti modula elastičnosti ploča sa srednjicom od papirnog saća za najmanje 6,9 %. Analitička rješenja kojima se ne uzima u obzir strukturni oblik jezgre ne mogu se upotrijebiti za proračun modula elastičnosti tzv. sendvič-ploča, čija jezgra ima heksagonalne ćelije.
Keywords (EN)
Subject (other)
License
cc-bycc-by CC-BY - Attribution
Open access date
July 15, 2022