Effect of Microstructures on the Shear Strength of Larix kaempferi

Shear strength is important for the application of Larix kaempferi (Lamb) Carr. The structural difference between earlywood and latewood affects its mechanical properties, especially shear strength. microstructures in kaempferi, however, are different. In this study, we investigated failure mode RL direction 40 specimens. results demonstrated that initial crack appears any location a growth ring, whereas concentrated earlywood, as well junction latewood. destruction tear destruction, when happened latewood, one to three cells usually adhered At cell wall level, was mostly observed microfibril angle (MFA). When occurs also intercellular layer preserves complete morphology tracheids. wood ray, ray detach intact from determined by microstructure Our research suggests density, thickness, MFA have significant differences found an 25.4°, thickness 6.36 µm, density 0.39 g/cm3. MFA, were 17.60°, 12.37 0.78 g/cm3, respectively. However, there no crystallinity (43.97%) (42.79%). correlation showed with thin wall, large low had poor performance, while thicker tracheid, smaller higher better performance. Therefore, occurred, it occurred earlywood. We thus deduced synergically affect L. kaempferi.