| 稻谷吸湿性应力裂纹分形模型的动力学分析 |
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| 引用本文： | 杨国峰,陈江. 稻谷吸湿性应力裂纹分形模型的动力学分析[J]. 中国粮油学报, 2011, 26(9): 6-13 |
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| 作者姓名： | 杨国峰 陈江 |
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| 作者单位： | 南京财经大学食品科学与工程学院,南京,210003 |
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| 基金项目： | 国家科技支撑计划(2009BAD0B03) |
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| 摘 要： | 将稻谷裂纹的生成看作籽粒内微缺陷扩展而成,建立了裂纹扩展分形模型,给出了分形模型背景下裂纹扩展的判据,推导出吸湿情况下断裂面的表面能,分析了分形模型的动力学特性。结果表明:吸湿性裂纹扩展路径通过淀粉颗粒,且宏观扩展方向受分形效应影响;分形效应降低了微裂纹扩展不规则程度;在吸湿膨胀情况下,淀粉对稻谷抗裂能力影响的本质是淀粉平均相对分子质量Mr存在差异,由于淀粉颗粒的Mr与直链淀粉含量的非线性关系的存在,使得裂纹率与直链淀粉的线性相关性并不显著。
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| 关 键 词： | 稻谷 吸湿裂纹 分形几何 淀粉颗粒 直链淀粉含量 相对分子质量 |
Dynamic Analysis of Fractal Model in Rice Moisture - adorption Crack |
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| Yang Guofeng,Chen Jiang. Dynamic Analysis of Fractal Model in Rice Moisture - adorption Crack[J]. Journal of the Chinese Cereals and Oils Association, 2011, 26(9): 6-13 |
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| Authors: | Yang Guofeng Chen Jiang |
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| Affiliation: | Yang Guofeng Chen Jiang (College of Food Science and Engineering,Nanjing University of Finance and Economics,Nanjing 210003) |
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| Abstract: | In this paper,the potential of resistance to rice cracks was studied by the fractal theory.Four types of propagating models of stress cracks were established.Under moisture-adsorption condition,criterion for fissure propagation was given and surface energy of fractures was also deduced.The propagating kinetics of stress cracks was investigated as well.The results showed the propagating movement of rice moisture-adsorption crack was influenced by fractal effect and the potential of resistance to cracks depen... |
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| Keywords: | rice moisture-adsorption crack fractal geometry starch granule content of amylose molecular weight |
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