Termiliselt töödeldud sanglepa spoonist valmistatud vineeri katsetamine
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Kuupäev
2023
Kättesaadavus
05.09.2023
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Termiliselt töödeldut puitu on toodetud juba ammustest aegades. Termotöödeldud puit
omab head vastupanu niiskusele ning omandab puit ka omapärase värvuse. Samuti
muutub puit peale termotöötlust kergemaks ning seda on ka kergem töödelda.
Lõputöö eesmärgiks oli katsetada termiliselt töödeldud sanglepa spoonist valmistatud
vineeri. Selleks uuriti vineeri paindetugevust, kõvadust ning nihketugevust. Katsete
teostamisel kasutati seadet Instron 3369 ning programmi Bluehill Universal. Katsed
sooritati kasutades termiliselt töötlemata vineeri ning ka 10 erinevat termotöötlusastmega
vineeri. Kokku sooritati katsed 858 katsekehale.
Paindekatsetuste käigus selgus, et pikikiudu ja ristikiudu katsetkehade elastsusmoodul on
väga erinev. Näiteks töötlemata vineeri keskmine elastsusjõud pikikiudu oli 9755,66 MPa,
kuid ristikiudu oli selleks 4431 MPa. Samuti erinesid suuremal määral ka paindetugevuse
väärtused võrreldes pikikiudu ja ristikiudu katsekehasid.
Uurimustöö tulemusi saavad kasutada näiteks ettevõtted, kes toodavad või müüvad
termiliselt töödeldud musta lepa vineeri.
Thermally treated wood has been produced since ancient times. Thermally treated wood has a good resistance to moisture, and the wood also acquires a peculiar color. Also, wood becomes lighter after heat treatment and is also easier to work with. The aim of the thesis was to test the plywood made of thermally treated black alder veneer. For this purpose, the bending strength, hardness and shear strength of the plywood were studied. The Instron 3369 device and the Bluehill Universal program were used for the experiments. Tests were performed using non-thermally treated plywood as well as 10 different levels of thermally treated plywood. A total of 858 test specimens were tested. During the bending tests, it was found that the modulus of elasticity of the longitudinal fiber and cross fiber test specimens is very different. For example, the average yield strength of untreated plywood along the longitudinal grain was 9755.66 MPa, but that of the cross grain was 4431 MPa. Also, the flexural strength values differed to a greater extent when comparing longitudinal fiber and cross fiber test specimens. The results of the research can be used, for example, by companies that produce or sell thermally treated black alder plywood.
Thermally treated wood has been produced since ancient times. Thermally treated wood has a good resistance to moisture, and the wood also acquires a peculiar color. Also, wood becomes lighter after heat treatment and is also easier to work with. The aim of the thesis was to test the plywood made of thermally treated black alder veneer. For this purpose, the bending strength, hardness and shear strength of the plywood were studied. The Instron 3369 device and the Bluehill Universal program were used for the experiments. Tests were performed using non-thermally treated plywood as well as 10 different levels of thermally treated plywood. A total of 858 test specimens were tested. During the bending tests, it was found that the modulus of elasticity of the longitudinal fiber and cross fiber test specimens is very different. For example, the average yield strength of untreated plywood along the longitudinal grain was 9755.66 MPa, but that of the cross grain was 4431 MPa. Also, the flexural strength values differed to a greater extent when comparing longitudinal fiber and cross fiber test specimens. The results of the research can be used, for example, by companies that produce or sell thermally treated black alder plywood.
Kirjeldus
Rakenduskõrgharidusõppe lõputöö
Puidutöötlemise tehnoloogia õppekaval
Märksõnad
lõputööd, termiline töötlus, must lepp, paindetugevus, nihketugevus