摘要
以马尾松为研究对象,运用原位成像纳米压痕技术测试了两种不同微纤丝取向（微纤丝角）下马尾松细胞壁纵向弹性模量和硬度之间的差异,由此探索微纤丝角对其细胞壁力学性能的影响,结果表明,上述两种力学性能指标与微纤丝角之间存在负相关关系,微纤丝角从13.5°增加到21.7°,马尾松管胞细胞壁纵向弹性模量降低了18.77%,硬度减少了18.37%。纳米压针从细胞壁的纵向压入时,细胞壁变形机制以塑性变形为主,微纤丝角越大,最大压入深度也越大,残余变形量也越大,但残余变形占总变形的比例几乎相同,约为73%。
This article takes the masson pine as the object of study, has tested the difference between the longitudinal elasticity module and hardness in different micro？bril angle（MFA）of masson pine cell wall, and explores relations between the MFA and masson pine cell wall. The results show that these two mechanical properties have all decreased with the MFA increase, and there is negative correlation between the longitudinal elasticity module and hardness of masson pine cell wall and the MFA, but elastic modulus more dependent on the MFA than hardness, as MFA increase from 13.5° to 21.7°, the elastic modulus of the Massoniana tracheid cell wall has decreased 18.77%, and the hardness has reduced 18.37%.When the Nano-pressure needle presses vertically in the cell wall, plastic deformation is the mainly deformation mechanism. Meanwhile, with the MFA increase, maximum indentation depth and the residual deformation all increase, but the residual deformation accounts for the total deformation almost the same, about 73%. The above results indicates that MFA within the limit of 13.5°to 21.7°,the viscoelasticity of the masson pine cell wall is analogous.
基金
国家自然科学基金项目（30730076）
国家科技支撑项目（2006BAD19B04）
