Shear strength parallel to grain with distinct ray orientation on four Brazilian wood species

Abstract

Ray orientation (perpendicular, parallel and diagonal) was compared with respect to shear strength parallel to grain and specific gravity in four Brazilian wood species. Higher absolute strengths occurred with ray oriented perpendicular to the shear plane, and lower ones for parallel orientation for almost all species. In particular, specimens with parallel ray orientation to shear plane did not differ statistically from shear values when compared to specimens having perpendicular and diagonal orientation to shear plane.

Relationship between anatomy and shear strength in wood of Larix sibirica

“…However, these small effects occur simultaneously and thus correlations between ray numbers and SS are difficult to observe. Longui et al (2017) made similar observations in terms of SS of some Brazilian wood species.…”

Root to branch wood anatomical variation and its influence on hydraulic conductivity in five Brazilian Cerrado species

“…Burgert et al (1999) and Reiterer et al (2002) emphasize the biomechanical role of rays. Longui et al (2016) studied shear strength parallel to grain with distinct ray orientation on four Brazilian wood species (Balfourodendron riedelianum (Engl.) Engl., Dipteryx alata Vogel, Myracrodruon urundeuva Allemão and Peltophorum dubium (Spreng.)…”

Proposta de modelo para a estimativa da resistência característica à tração inclinada de madeiras de folhosas

“…Alternativamente, modelos empíricos foram desenvolvidos por pesquisadores diversos das áreas de madeira e de estruturas de madeira para estimar a resistência desse material em função do ângulo de inclinação das fibras (θ), em diversas formas de solicitação (LONGUI et al, 2017). As Equações de 1 a 4 expressam alguns dos modelos empíricos, em que f0, f 45 e f 90 consistem nos valores de resistência (f) determinados experimentalmente com base nas solicitações mecânicas aplicadas paralelamente às fibras (0º), a 45º e a 90º de inclinação respectivamente, e n é o expoente de ajuste dos termos trigonométricos considerado inteiro (1, 2 e 3).…”