杨木压缩应力-应变关系研究  

Stress-strain relationship with compression of poplar

作　　者：张红为[1] 胡兵[1] 邵卓平[1] 

机构地区：[1]安徽农业大学林学与园林学院,合肥230036

出　　处：《安徽农业大学学报》2010年第4期665-668,共4页Journal of Anhui Agricultural University

基　　金：国家自然科学基金项目(30571452);安徽农业大学创新团队共同资助

摘　　要：研究杨木在不同温度条件下径向压缩大变形的力学行为,建立杨木在压缩大变形下的应力-应变关系,并观察横压过程中的杨木细胞变形特征。结果表明,杨木在径向施压下,其整个大变形过程可分为3个阶段,即线弹性阶段、屈服后弱线性强化阶段和幂强化阶段。但由于木材在横压大变形实验中压密点不易确定,故以一个线性方程描述其弹性阶段和一个3次多项式描述其屈服后的整个压缩大变形下的应力-应变关系更为方便。The mechanical behavior in poplar at different temperatures along the radial compression under large deformation was studied. Stress-strain relationship of poplar was established in compression under large deformation, and the process of cross-pressure deformation characteristics of the poplar cells was observed. The results show that under pressure from poplar wood in the radial, the entire process of large deformation can be divided into three stages ： linear elastic stage, the weak linear hardening after yielding stage and the power hardening stage. It is difficult to determine compression dense point, so a linear equation was used to describe its elastic phase, and a 3 times polynomial description of the compression stress-strain relationship of its post-yield deformation is more convenient.

关 键 词：杨木 压缩大变形 应力-应变关系 

分 类 号：S781[农业科学—木材科学与技术]