CONTRIBUTIONS TO A METHOD AND A NEW TECHNIQUE FOR DETERMINATION OF SOME IMPORTANT MECHANICAL PROPERTIES OF MASSIVE WOOD TEXTURE

Ştefan BEŞLIU, Gheorghe GUTT, Sonia AMARIEI

Abstract

This article proposes and describes a new method and tehnique for testing and determining of some important mechanical characteristics of massive wood. The method is based on the use of a loading-unloading continuous cycle of steel indenter until its penetration to a predetermined depth in the wooden material. During the cycle the force-displacement values are recorded in real time, values that are shown in a graph by an adequate software that can determine the hardness (by measuring the force in correlation to the displacement it causes) and also the following mechanical characteristics: hardness under load, modulus of elasticity, total deformation energy, elastic deformation energy, plastic deformation energy, relaxation and creep of samples. The equipment used to implement the method are a mix of field and laboratory equipment which have a constant speed of continuos loading-unloading system of indenter, an electronic sensor system made of a dynamometer cell used for measuring the force applied to the indenter and an incremental electronic displacement sensor for measuring the depth of penetration for the sperical indenter of 5.5 mm in the wooden material, as well as a PC equiped with a specialized software to interpret the experimental data.

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