Research on composite mechanical properties of larch under perpendicular-to-grain tension/compression and transversal shear

The majority of wood within the actual wooden structure experiences a combination of normal stress along the grain and transverse shear stress. A lever-loading device and specimen were developed and manufactured to assess the composite mechanical properties of wood under tension/compression and shear stress. Experiments were conducted to evaluate longitudinal tension/compression, transverse shear, longitudinal normal stress, and transverse shear stress under combined loading conditions. The uniaxial testing machine supplied the shear load, while the lever device facilitated tension/compression loading. The investigation delved into failure modes, stress-strain curves, and composite strength characteristics of wood specimens under various normal-shear combined stresses. Furthermore, the study explored the efficacy of classical orthotropic strength criteria in determining the normal-shear composite strength of wood. Results indicate that Hill criterion and Hasebe criterion exhibited superior performance.These findings serve as crucial reference for the precise stress analysis of wooden structures.