Improvements to the procedure for flexural testing, on two spans, of full wood-based sandwich panel subject to uniform load

Published Date

15 January 2016, Vol.102:281–296, doi:10.1016/j.conbuildmat.2015.10.119

Title 

Improvements to the procedure for flexural testing, on two spans, of full wood-based sandwich panel subject to uniform load

• Author 

• Salvador Estrada-Martínez ^a,,
• Victoria Mollón ^b,
• Jorge Bonhomme ^c,

• aITMA Materials Technology (Fundación ITMA), Parque Tecnólogico de Asturias S/N, Llanera 33482, Spain
• bDepartment of Material Science and Metallurgical Engineering, University of Oviedo, Calle Independencia 13, Oviedo 33004, Spain
• cDepartment of Construction and Manufacturing Engineering, University of Oviedo, Campus de Gijón, Gijón 33203, Spain

Received 27 April 2015. Revised 16 September 2015. Accepted 18 October 2015. Available online 4 November 2015.

Highlights

• •
  We improved Annex C1, ETAG 016-Part 1: flexural testing, two spans, uniform load.
• •
  This procedure was checked on four of the main types of wood-based sandwich panel.
• •
  The comparison with analytical models was made, and uncertainties were estimated.
• •
  EOTA TR 019-A3 is not considering properly the thicknesses of the faces.
• •
  Should be avoided taking data from literature, for being used in analytical models.

Abstract

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.

Graphical abstract

Keywords

• Sandwich panel
• SIPs
• Wood-based sandwich
• Flexural testing
• Two spans
• ETAG 016
• TR 019

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• ⁎ 
  Corresponding author.

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