Relative influence of cellular morphology and microfibrillar angle on longitudinal/tangential elastic anisotropy of softwood tissues

Microfibrillar angle (MFA) influence on elastic anisotropy Longitudinal/Tangential (L/T) of softwood wooden tissues is illustrated through a multi scale modelling. Elastic anisotropy results in the one hand from a geometric effect of cellular morphology and, in the other hand, from double cell wall anisotropy controlled by microfibrillar angle in S-2 sub layer. As a result, it is shown here that tissular anisotropy of early wood is mainly governed by the geometry of cellular network, whereas MFA is an essential parameter to explain the latewood tissue anisotropy.