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Mechanical performance of linseed oil impregnated pine as correlated to the take-up level
Luleå tekniska universitet.
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
Luleå tekniska universitet.
2002 (English)In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 36, no 1, p. 1-18Article in journal (Refereed) Published
Abstract [en]

The mechanical performance of pine sapwood (pinus sylvestris), impregnated with linseed oil to different take-up levels, is evaluated using several test methods. SEM is used to study morphological changes following the impregnation procedure. The reduction of mechanical properties is attributed to a) localized cell wall damage in the ray region that facilitates longitudinal inter-cell split in L-R plane (macrocrack) initiation and propagation; b) submicroscopical cracking in the S1 sublayer that reduces the resistance to Mode I and Mode II inter-cell splitting at any location where the oil front has passed. Mechanical testing shows the following effect of the impregnation on failure a) the Mode I fracture toughness GIc in L-T and L-R planes, determined in DCB test, is significantly lowered with no significant difference in fracture resistance reduction in between planes; b) 3-point flexural test for specimen geometry leading to cracking in R-L and T-L planes show that the flexural strength as well as flexural modulus are reduced due to impregnation; c) 3-point flexural tests on longitudinal specimens used to determine the impregnation effect on longitudinal modulus EL and shear moduli GLT and GLR, reveal only minor changes. Fracture surfaces in mechanical tests are analyzed using SEM, and differences are explained by described microdamage mechanisms.

Place, publisher, year, edition, pages
2002. Vol. 36, no 1, p. 1-18
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-14912DOI: 10.1007/s002260100120ISI: 000174538700001Scopus ID: 2-s2.0-0036487748Local ID: e5a34ab0-b51b-11db-bf94-000ea68e967bOAI: oai:DiVA.org:ltu-14912DiVA, id: diva2:987885
Note
Validerad; 2002; 20070205 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Varna, Janis

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