Direct measurement of strain distribution along a wood bond line. Part 1: Shear strain concentration in a lap joint specimen by means of electronic speckle pattern interferometry
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Ulrich Müller
Abstract
Phenol-resorcinol-formaldehyde (PRF) and one-component polyurethane (PUR) resins were used to manufacture single lap joint samples corresponding to EN 302-1. 3D electronic speckle pattern interferometry (ESPI), which enables measurement of spatial displacement of less than 0.1 μm, was used during tensile shear experiments to observe full-field in-plane and out-of-plane deformation of the lap joint samples and to detect strain concentrations in the vicinity of glue lines. Finite element analysis was performed to validate ESPI measurements. In general, ESPI measurements showed that in a lap joint experiment a very small volume of material close to the ends of the overlapping area is highly strained. ESPI and finite element analysis pointed out that PUR glue lines are characterised by much higher shear deformations than PRF glue lines, especially at the ends of the overlapping area. However, due to the lower Young's modulus of PUR resin compared to PRF, higher shear strains but lower shear stress concentrations can be expected in PUR, which was confirmed by the FE model.
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Artikel in diesem Heft
- Molecular dynamics study of lignin constituents in water
- Oxidative cellulose degradation by cellobiose dehydrogenase from Phanerochaete chrysosporium: A model compound study
- Characterization of active oxygen species under oxygen-alkali bleaching conditions
- Erythro/threo ratio of β-O-4-5 structures as an important structural characteristic of lignin. Part 4: Variation in the erythro/threo ratio in softwood and hardwood lignins and its relation to syringyl/guaiacyl ratio
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- Liquefaction of CCA-treated wood and elimination of metals from the solvent by precipitation
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- Chemical composition and antifungal activity of essential oil isolated from Chamaecyparis formosensis Matsum. wood
- Direct measurement of strain distribution along a wood bond line. Part 1: Shear strain concentration in a lap joint specimen by means of electronic speckle pattern interferometry
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- Resistance of thermo-hygro-mechanically densified wood to colonisation and degradation by brown-rot fungi
- Microbial colonizers of freshly sawn yellow-poplar (Liriodendron tulipifera L.) lumber in two seasons. Part 3: Yeasts
- Efficacy of a copper(II)/oxine copper wood preservative mixture after 69 months of outdoor ground-contact exposure and a proposed mechanism to explain the observed synergism
- Differentiation of indoor wood decay fungi with MALDI-TOF mass spectrometry
- Horst H. Nimz celebrates his 75th birthday on April, 21st, 2005
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