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OALib Journal期刊
ISSN: 2333-9721
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落叶松锯屑在木粉加工过程中的断裂分析
DOI: 10.3969/j.issn.1000-2006.2013.06.025, PP. 127-131
Keywords: 落叶松锯屑,木粉,断裂分析
Abstract:
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0.08mm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。
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