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玉米種子內(nèi)部機(jī)械裂紋產(chǎn)生與擴(kuò)展的微觀機(jī)理
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國家自然科學(xué)基金資助項(xiàng)目(50675143),、高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金資助項(xiàng)目(200801570007)和遼寧省自然科學(xué)基金資助項(xiàng)目(20082124)


Micromechanism of Inner Mechanical Cracks Generation and Expansion of Corn Seed Kernel
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    摘要:

    應(yīng)用Cottrell位錯(cuò)塞積模型分析了玉米種子內(nèi)部機(jī)械裂紋產(chǎn)生機(jī)理，采用Griffith能量平衡理論和分形幾何理論推導(dǎo)了機(jī)械裂紋擴(kuò)展速度與擴(kuò)展路徑維數(shù)計(jì)算公式，并對(duì)內(nèi)部機(jī)械裂紋擴(kuò)展速率進(jìn)行分形分析。結(jié)果表明：當(dāng)玉米種子局部所受應(yīng)力達(dá)到一定時(shí)，其內(nèi)部即產(chǎn)生機(jī)械裂紋,；根據(jù)玉米種子內(nèi)部機(jī)械裂紋擴(kuò)展運(yùn)動(dòng)學(xué)公式,，內(nèi)部裂紋擴(kuò)展宏觀速度小于分形擴(kuò)展速度,；由玉米種子內(nèi)部機(jī)械裂紋擴(kuò)展路徑的分形維數(shù)公式求出其維數(shù)為1.1395,；淀粉顆粒尺寸相同時(shí),，裂紋沿淀粉顆粒擴(kuò)展的速率最快。

    Abstract:

    Mechanism of inner mechanical cracks of corn seed kernel was researched by means of Cottrell piling up of dislocation theory. The formula of expanding speed and propagation route dimension of inner mechanical cracks were inferred based on theory of Griffith energy balance and fractal geometry. Crack growth rate was analyzed through fractal method. The results showed that inner mechanical cracks of corn seeds formed when part stress increased to a certain level. According to phoronomics formula of inner cracks propagation, the macro speed propagation was less than fractal propagation speed. Fractal dimension of 1.1395 was calculated by path formula of mechanical cracks propagation. The speed of cracks propagation along starch particles extending was faster than same size of starch particles.

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張新偉,李心平,楊德旭,劉德軍,高連興.玉米種子內(nèi)部機(jī)械裂紋產(chǎn)生與擴(kuò)展的微觀機(jī)理[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2012,43(12):72-76. Zhang Xinwei, Li Xinping, Yang Dexu, Liu Dejun, Gao Lianxing. Micromechanism of Inner Mechanical Cracks Generation and Expansion of Corn Seed Kernel[J]. Transactions of the Chinese Society for Agricultural Machinery,2012,43(12):72-76.

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  • 在線發(fā)布日期: 2012-12-13
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