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仿生棱纹几何结构表面的土壤磨料磨损

ISSN号：1004-0595
期刊名称：《摩擦学学报》
时间：0
分类：TH117.3[机械工程—机械设计及理论]
作者机构：[1]吉林大学地面机械仿生技术教育部重点实验室,吉林长春130022
相关基金：国家自然科学基金资助项目（50675087,50635030）;国家杰出青年科学基金资助项目（50025516）.

关键词：栉孔扇贝壳, 几何结构表面, 仿生表面, 土壤, 磨料磨损性能, shell of Farrer＇ s scallop, geometrical textured surface, biomimetic surface, soil, abrasive wear

中文摘要：

利用逆向工程技术，对栉孔扇贝壳外表面几何结构进行扫描测量和处理并获得数据点云，采用最小二乘法拟合数据而设计了3种分布的棱纹型仿生几何结构表面，与相同材料和基本尺寸平板试样对比，在转盘式土壤磨料磨损试验机上进行磨料磨损试验．结果表明：栉孔扇贝壳外棱纹轮廓几何结构表面具正弦函数特征；棱纹轮廓方程为．f（x）=3sin（0．4x），棱纹高度为3mm，棱纹底宽为7．854mm．棱纹间距分别为15．71mm、12．56mm和9．42mm的3种仿生棱纹型几何结构表面的耐磨性能均优于平板；相对于平板试样，在相对滑动速度为1．68m／s时，棱纹型仿生几何结构表面的磨损质量损失减少29．84％～43．28％：在相对滑动速度为2．35m／s时，棱纹型仿生几何结构表面的磨损质量损失减少16．23％-21．91％．这是由于仿生棱纹结构能够改变磨料在磨损表面流场的接触和运动状态，增加剪切层厚度．减小剪切层内的磨料密度，改变磨粒的运动轨迹，从而提高其耐磨性．

英文摘要：

Reverse engineering method was employed to examine the contour of the surface of shell of Farrer＇ s scallop, and the cloud points of the surface were obtained. The geometry of the surface was featured by means of laser scanning measurement, error processing, smoothing processing and simplifying processing of the cloud points. The cloud points of the contour orthogonal to the ridges on the surface were fitted by the recursive least-square method. The orthogonal contour of the outside surface of the shell of Farrer＇ s scallop to the ridges possessed sinusoidal feature. Three biomimetic ridge structural surfaces were designed. The contours of the ridges were determined by a ridge contour equation as, with a height of 3 mm, and a bottom width of 7. 854 mm. Three kinds of biomimetic specimens with varied distance between adjunct two ridges were prepared. The materials used for biomimetic surface specimens were made from bakelite and light calcium carbonate, and zinc stearate for demolding under 20 MPa at 165 ℃ for hot pressing. The abrasive wear was run on a rotary-disk type abrasive wear tester. All three biomimetic surfaces exhibited better abrasive wear resistance than the common smooth plate under the identical condition. The effect of geometrical textured structure of the biomimetic surfaces on the interracial flow field between biomimetic surface and abrasive material were discussed. The contact and movement of the abrasive material with the biomimetic surface at the interfacial flow field was changed by the biomimetic surface as shear layer was thicker as compared with the common smooth plate, the abrasive material within shear layers was loosened and abrasive particle trajectory was altered, which would be the main mechanism that the biomimetic surfaces exhibited higher abrasive wear resistance than the common smooth surface.

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