竹材横向断裂的物理模型与能量吸收机制:纤维束的断裂与抽拔

竹材横向断裂的物理模型与能量吸收机制：纤维束的断裂与抽
拔
邵卓平;王福利;吴贻军
【期刊名称】《林业科学》
【年(卷),期】2012(048)008
【摘要】采用细观力学方法,研究竹材在横弯断裂过程中竹纤维束断裂与抽拔这2
种损伤模式的能量吸收机制,并实际计算基本组织开裂、界面分层、竹纤维束断裂、竹纤维束抽拔4种损伤模式对竹材横弯断裂的增韧贡献.结果表明:1)不同组织结构
在损伤演化过程中会因不同的能耗而具有不同的增韧贡献,在这4种导致竹材优良
强韧性能的主要结构因素中,单位面积上纤维束拔出功对断裂功的贡献最大,其次是
纤维束断裂；2)通过对试件的断裂总耗能试验值与按照4种损伤模型计算的耗能
理论值进行比较,二者结果很接近,表明本文对竹材不同组织结构在横弯失效中的力
学功能所建立的物理模型基本正确.%In this paper, the moso-mechanics method was applied to study the energy absorbing mechanism of the fracture pattern and pulling-out pattern of bamboo fiber during process of bamboo transverse bending fracture. The toughness contributed by the cracking pattern of ground tissue, the layering pattern of interface, the fracture pattern and pulling-out pattern of fiber was calculated actually. The results indicated that; 1 ) different organization structures contributed different toughness to the evolution of damage because of different energy wastage and among the four main structure factors that lead to the excellent toughness property of bamboo, the pulling-out of fiber
contributed most and the fracture of fiber second. 2) the comparison between the test value of the total energy wastage of fracture and the calculated theory value of the total energy wastage of the four damage patterns showed that the two values were very close. It indicated that the physical model founded for the mechanics functions of different organization structures in the process of transverse bending damage was right.
【总页数】5页(P118-122)
【作者】邵卓平;王福利;吴贻军
【作者单位】安徽农业大学林学与园林院合肥230036;安徽农业大学林学与园林院合肥230036;安徽农业大学林学与园林院合肥230036
【正文语种】中文
【中图分类】S781.9
【相关文献】
1.毛竹材层间Ⅰ型断裂能的确定 [J], 郝智;杨树桐
2.竹材横向断裂的物理模型与能量吸收机制:基本组织开裂与界面脱粘 [J], 邵卓平;吴贻军;王福利
3.竹材Ⅲ型层间的断裂韧性 [J], 李启志;王福利;邵卓平
4.团簇状缺陷对纤维束断裂过程的影响 [J], 曹振;郝大鹏;唐刚;寻之朋;夏辉
5.皮质骨在拉伸型、剪切型和撕裂型加载条件下的断裂韧性──纵向断裂和横向断裂的比较 [J], 冯祖德
因版权原因，仅展示原文概要，查看原文内容请购买。