落叶松锯屑在木粉加工过程中的断裂分析

范长胜; 杨冬霞; 杨春梅; 张宏

doi:10.3969/j.issn.1000-2006.2013.06.025

落叶松锯屑在木粉加工过程中的断裂分析

范长胜,杨冬霞,杨春梅,张宏

南京林业大学学报（自然科学版） ›› 2013, Vol. 37 ›› Issue (06) : 127-131.

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南京林业大学学报（自然科学版） ›› 2013, Vol. 37 ›› Issue (06) : 127-131. DOI: 10.3969/j.issn.1000-2006.2013.06.025

研究论文

落叶松锯屑在木粉加工过程中的断裂分析

范长胜¹,杨冬霞^1,2,杨春梅^1*,张宏^1,3

作者信息 +

Fracture analysis of larch softwood sawdust in the wood flour processing

FAN Changsheng¹, YANG Dongxia^1,2, YANG Chunmei^1*, ZHANG Hong^1,3

Author information +

文章历史 +

摘要

以干燥后的落叶松锯屑为研究对象,在落叶松锯屑被加工成木粉的过程中,用显微镜分析了不同粒径锯屑颗粒的断裂形态和大小。试验结果表明:粒径为0.08 mm木粉形态主要呈棒状,放大40倍后可见管胞径壁上的纹孔和任意排列的纤丝; 颗粒内裂纹的产生和扩展是引起锯屑颗粒断裂的主要原因。基于干燥后的锯屑为脆性板层材料的基本假设,运用断裂力学理论,结合试验分析结果,研究了锯屑断裂过程中木粉颗粒内裂纹间的相互作用机理,得到了适用于锯屑颗粒的断裂判据。

Abstract

The fracture criterion of wood flour is proposed based on the experimental and theoretical results from the dried larch sawdust. The fracture morphology and size of the different mesh sawdust were observed by the microscope in the preparing process of the dried larch sawdust into wood flour. The experimental result shows that the 0.08 mm wood flour mostly is in the form of sticks and includes the pits and arbitrarily arranged filaments on the radial wall of the tracheid observed clearly after enlarged 40 times. The experimental phenomenon presents that the main reason resulting in the fracture of the sawdust grain is the initiation and propagation of the crack in the sawdust grain. The interactive mechanism between cracks in the sawdust grain during the fracture process of sawdust was investigated by using the theory of fracture mechanics and the experiment results. The fracture criterion of the sawdust grain was obtained based on the interactive mechanism and a fundamental assumption that the dried sawdust is the brittle plate layer material.

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范长胜,杨冬霞,杨春梅,张宏. 落叶松锯屑在木粉加工过程中的断裂分析[J]. 南京林业大学学报（自然科学版）. 2013, 37(06): 127-131 https://doi.org/10.3969/j.issn.1000-2006.2013.06.025

FAN Changsheng, YANG Dongxia, YANG Chunmei, ZHANG Hong. Fracture analysis of larch softwood sawdust in the wood flour processing[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2013, 37(06): 127-131 https://doi.org/10.3969/j.issn.1000-2006.2013.06.025

中图分类号： S781

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基金

收稿日期:2012-08-24 修回日期:2013-01-18
基金项目:国家自然科学基金项目(31070500,31170517,31160196); 黑龙江省教育厅科学技术研究项目(12533043); 中央高校基本科研业务费专项资金项目(DL12C B05)
第一作者:范长胜,讲师,博士生。*通信作者:杨春梅,副教授。E-mail: 823961935@qq.com。
引文格式:范长胜,杨冬霞,杨春梅,等. 落叶松锯屑在木粉加工过程中的断裂分析[J]. 南京林业大学学报:自然科学版,2013,37(6):127-131.