竹材在压缩大变形下的力学行为__微观变形特征.pdfVIP

18 1 2004 1 Vol. 18No. 1 CHINA WOOD INDUSTRY J anuary 2004 . 邵卓平 ( , 230036) : 以毛竹小试件为对象, 使用显微加载装置研究了竹材在三 个方向的压 大变形下微观结构的变化特征。研究表 明, 竹材在径向受压和弦向受压时具有相同的屈服极限, 这主要取决于薄壁基本组织在横向具有相同的屈服行为。由于 竹材基本组织是传递荷载的优良基体, 竹壁在径向压 和弦向压 下具有相同的宏观力学行为, 可视为两相纤维复合材 料; 在轴向压 大变形下, 竹材承载的主体是竹纤维, 轴压屈服极限是横压屈服极限的3 倍。 : 毛竹; 压 大变形; 微观特征 中图分类号: 795　　文献标识码: 　　文章编号: 1001-8654( 2004) 01-0027-03 S A Mechan cal Behav or of Bamboo w th Large Def ormat on . The Character st cs of M crocosm c Deformat on - SHAO Zhuo ping ( Dep rtment of Forest Products Indu stry, Anhui Agricultur l University, Hefei 230036, Chin ) Abstract: The rel tionship betw een the ch nges of microstructure nd mech nic l beh vior of M oso B mboo ( P hyl lostachys p ubesc ens) w ith l rge compressive deform tion w ere determined with - . : , micr oscope lo ding device B mboo s mples w ere compressed in thr ee dir ections r di l t ngenti l nd longitudin l. The results indic ted th t : 1) under r di l nd t ngenti l compr ession, p renchy - m tous gr ound tissue w s the b sic component for tr nsferring lo ds. It exhibited the s me yield perform nce nd, ther efore, bore the s me y ield limit . In the s me w y, the b mboo w ll reve led , - the s me m cro mech nic l beh vior w hich show ed b mboo could be reg rded s tw o dimension l composite m teri l. 2) Under longitudin l compr ession, the lo ds were