ITMA Materials Technology Fundacion ITMA

Llanera, Spain

ITMA Materials Technology Fundacion ITMA

Llanera, Spain

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Estrada-Martinez S.,ITMA Materials Technology Fundacion ITMA | Mollon V.,University of Oviedo | Bonhomme J.,University of Oviedo
Journal of Sandwich Structures and Materials | Year: 2017

This work deals with the durability assessment, after ageing, of wood-based sandwich panels, carried out according to the European guideline ETAG 016, Annex C7 Climatic testing cycles. ETAG 016-2 is a guideline to assess the wood-based sandwich panels for roofs. It has tests and criteria for evaluating the results of these tests. As regards durability and performance under the weather, it proposes to choose one of three different climatic cycles. The choice depends on the material of the core. Each climate cycle has assessment criteria to measure whether the cycle has been successfully overcome or not. This assessment is related to the standard EN 14509, paragraph 5.2.3.1 that contains the same climatic test cycles. In this work we subjected several types of non-metallic sandwich panels to this test and criteria. Then, a critical review of these acceptance criteria was done. As a result, some recommendations are proposed regarding the acceptance criteria and testing procedure. © 2015, © The Author(s) 2015.


Estrada-Martinez S.,ITMA Materials Technology Fundacion ITMA | Mollon V.,University of Oviedo | Bonhomme J.,University of Oviedo
Construction and Building Materials | Year: 2016

This work presents a detailed procedure for flexural testing, on two spans, of simply supported full wood-based sandwich panel subject to uniform load. This procedure improves the test described sparsely in the Annex C1 of EOTA-ETAG 016-Part 1: Guideline for European Technical Approval of Self-supporting Composite Lightweight Panels. To show the validity of the method, several tests were carried out in accordance with this procedure and the results were compared with analytical models. It was observed that the analytical models fit the experimental results with different accuracy on the prediction of the load at maximum allowed deflection, provided that the mechanical parameters of the constituent materials of sandwich panel are known accurately. It was also found that, in this type of sandwich panel, the thicknesses of the faces are not negligible, and therefore the shear stiffness of the sandwich should not be simplified in the equations. Additionally, it is included a simple method to estimate the uncertainties of some of the outcomes obtained in the test. © 2015 Elsevier Ltd. All rights reserved.

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