Application of the Moiré method in timber used on rural construction

Abstract

The wood is one of the materials most used in various fields of society and is considered an important structural element in the construction sector. Therefore, it is essential to study their responses about the physical and mechanical characteristics of the forest species for this use, and analyze new techniques to get this data. Thus, the aim of this study was to use the interferometric technique of Moire to detect the points of greatest tension in pieces of wood of macaranduba ( Manilkara sp.) and canela ( Cinnamomum zeylanicum Breyn) used in construction connected by metal screws and nails, to identify the strain points in wood subjected to different tension. Analysis of resistance to compression the of woods in the transverse direction to the fibers indicated that the macaranduba specie (Manilkara sp.) is the strongest, either with screw connector or nail connector of loads 1 and 2 ton, since presented dark color in response to optical analysis. Therefore, the use of the moire technique was capable of detecting changes on the surface of the wood studied subject to different compression forces by means of its optical phenomena involved, making it a potential tool in the study of small wooden structures.