Ensaios uniaxiais e biaxiais para avalição de criterio de resistencia de materiais anisotropicos aplicado a madeira / Uniaxial and biaxial tests for avaliation of failure criterion of anisotropic material applied to wood

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The completion of the uniaxial and biaxial tests permits a better understanding of the mechanical behavior of a material that has main failure directions and it is undoubtedly a method that researchers identified to achieve consistent results with the actual situation that a particular structure presents. This study aimed at studying the strength criterion proposed by Tsai and Wu, performing uniaxial and biaxial tests. The evaluation of this criterion was restricted to compression biaxial tests due to the difficulties presented by tension biaxial tests. With a compression biaxial test, the stresses in two main directions were simultaneously carried out, using a standard equipment test for one direction and for the perpendicular direction an equipment type pliers especially developed for this purpose. The failure parameter studied was 12 F , which evaluates the possibility of failure surface to be opened or closed, also considering that for the safety of design it is essential to obtain a closed surface for the failure criterion adopted. Furthermore, it was noted that in the compression biaxial test the parameter 12 F was obtained directly. For the species of wood Pinus elliottii and Goupia glabra (Cupiúba), the experimental values obtained were satisfactory with some inconsistencies observed in the light of the heterogeneity of the material

ASSUNTO(S)

madeira anisotropia wood wood materia - propriedades madeira - testes strenght of materials anisotropy matters resistencia de materiais

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