Abstract
The large amount of wood in Brazil related to the numerous uses of this material stimulates many studies to be carried out in order to use this raw material increasingly in a rational and adequate way. Compared with concrete and steel, wood presents an excellent relation between mechanical strength and its mass, beauty, low energy consumption for its processing, good thermal insulation and easy workability. In order to make the best use of wood, this work proposes to study the correlation between the values of the longitudinal modulus of elasticity (E) obtained in the 3-point bending test with a 14H and 21H (H = height of cross-sectional area) of specimen measurement between the supports. The data were analyzed through linear regression analysis, thus, three correlations were calculated between values from 14H of span length to the other 21H of span length in the test for a particular correlation of each hardwood species (Peroba Rosa and <i>Eucalyptus Tereticornis</i>) and the third one was generalized for the use in more hardwood species. Thus, the correlation of the longitudinal modulus of elasticity for the species of the hardwood group was possible for: Peroba Rosa (<i>Aspidosperma polyneuron</i>) with 35 specimens and Eucalyptus Tereticornis (<i>Eucalyptus tereticornis</i>) with 33 specimens.
Highlights
IntroductionBrazil is one of the most important countries in the world in relation to the forest sector, since it has a certified forest area equals to 6, 378, 006 ha (hectare) in its different biomes, each one with specific characteristics of the flora [1]
Brazil is one of the most important countries in the world in relation to the forest sector, since it has a certified forest area equals to 6, 378, 006 ha in its different biomes, each one with specific characteristics of the flora [1].In relation to other materials such as concrete, plastic, steel and aluminum, wood has a number of advantages, such as beauty, high mechanical resistance to mass, low energy consumption for its processing, good thermal insulation, easy workability [2].The physical and mechanical characteristics and relative abundance of this material enable its application for uses in interior finishes to large structures such as pavilions, roofs and bridges
This study is performed by linear regression analysis, which considers correlation equations for each studied species in order to take advantage of previous studies to the standard NBR 7190 (1997) [8], as well as a generalized equation for the hardwood group, from the two species data presented in the work
Summary
Brazil is one of the most important countries in the world in relation to the forest sector, since it has a certified forest area equals to 6, 378, 006 ha (hectare) in its different biomes, each one with specific characteristics of the flora [1]. Babiak et al [12] prepared specimens made of spruce wood (Picea Abies L.) and oak wood (Quercus robur L.) with dimensions of 20 (radial) × 20 (tangential) × 300 cm (longitudinal) to be tested in a Three and four point bending test to find out some mechanical properties of the species studied, between them, the modulus of elasticity, according to the standard EN 310 [13], for measurements in three-point bending, the support span was adjusted to l0=12×H. This work objectify the study of the correlation between the longitudinal modulus of elasticity determined in the 3-point static bending test with a span length between supports of 14H and 21H (H = height of the cross-sectional area of the specimen). This study is performed by linear regression analysis, which considers correlation equations for each studied species in order to take advantage of previous studies to the standard NBR 7190 (1997) [8], as well as a generalized equation for the hardwood group, from the two species data presented in the work
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