Bonding strength test method assessment for Cross-Laminated Timber Derived Stressed-Skin Panels (CLT SSP)

Luengo, Emilio; Hermoso, Eva; Cabrero, Juan Carlos; Arriaga, Francisco J.

doi:10.1617/s11527-017-1069-8

Cited by 5 publications

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“…Shear strength values in wood-glued elements are expected to change with the size of the specimen [31], which can lead to doubts regarding the assessment of this property depending on the test method chosen. However, in this case, the shear mechanical efficiency of the panels has been assessed using the same methodology and specimen size used to obtain the declared shear properties of the insulation core material, which has proven to be adequate for use in bending models for wood-based sandwich panels [28].…”

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Mechanical Efficiency and Quality Control Preliminary Analysis of Incompletely Bonded Wood-Based Sandwich Panels

Luengo

Martitegui

Bobadilla

et al. 2023

Forests

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Wood-based sandwich panels are building products composed of two skins attached to a lightweight continuous core in which at least one skin is made of wood-based products, contributing to the use of renewable forest goods. Since the connection between the skins and the core is often provided by adhesive bonding, its characteristics affect the mechanical behavior of the sandwich and, therefore, must be thoroughly assessed. Full adhesion is often considered the standard situation, although some batches of the commercial product show incompletely glued surfaces, and scarce data is available with regard to their bonding performance. For this reason, analyses were performed using tensile tests with a load perpendicular to the skins and specific shear tests with a load parallel to the longitudinal direction of the panel. The test samples were obtained from wood-based sandwich panels with extruded polystyrene cores and different skin materials. The tensile tests proved to be suitable only for panels with adequate skin material cohesion, their functionality improving as a control method when the glued surface percentage assessment is used together with the tensile strength. The results of the shear tests provided non-linear models relating the effect of the glued surface to the mechanical properties, revealing that the mechanical efficiency of the incompletely bonded specimens is better than that which might be expected if the core only worked in proportion to the glued surface, due to the help of the adjoining non-glued core material.

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confidence: 99%