Viscoelastic Characteristics and Creep Prediction for Laminated Veneer Lumber

The viscoelastic characteristics of Aspen laminated veneer lumber (LVD were investigated with results revealing the dynamic creep behaviour under asymmetrical cyclic loading, which is analogous to solid wood under a static load. Curves for the creep indicated that after 10s cycles, the multiple correlation coefficient R2 for the 4-element, is more than 0. 98 in any instance, overwhelmingly well fitted to the data obtained. The mean square error of the 3-element viscoelastic model was 1 - 5 times higher than of the 4-ele-ment model under various cyclic loadings within a relative large loading range. The viscoelastic curves for LVL samples are nonlinear. They were linearized at some stress levels below 60% of their limited intensities. As loading was sustained for a longer period, the viscous flow was found to have a tendency of attenuation. The work absorbed by a specimen before the occurrence of creep failure, could be estimated in terms of failure appearance. Consequently, we could calculate the

The viscoelastic characteristics of Aspen laminated veneer lumber (LVD were investigated with results revealing the dynamic creep behaviour under asymmetrical cyclic loading, which is analogous to solid wood under a static load. Curves for the creep indicated that after 10s cycles, the multiple correlation coefficient R2 for the 4-element, is more than 0. 98 in any instance, overwhelmingly well fitted to the data obtained. The mean square error of the 3-element viscoelastic model was 1 - 5 times higher than of the 4-ele-ment model under various cyclic loadings within a relative large loading range. The viscoelastic curves for LVL samples are nonlinear. They were linearized at some stress levels below 60% of their limited intensities. As loading was sustained for a longer period, the viscous flow was found to have a tendency of attenuation. The work absorbed by a specimen before the occurrence of creep failure, could be estimated in terms of failure appearance. Consequently, we could calculate the maximum creep deformation and fatigue limit under some stress levels within the creep limit .