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目的：研究试片表面粗糙度及分形维数对冰粘附强度的影响。方法通过对裸铝表面进行化学刻蚀及氟硅烷修饰,制备不同表面试片,测试试片表面的粗糙度和分形维数,应用冰粘附强度实验装置测试不同试片表面的冰粘附强度。结果粗糙度(x)与粘附强度(y)的关联式为：y=1.0966x+51.816(亲水表面), y=-0.67x+74.98(疏水表面)。分形维数(z)与粘附强度(y)的关联式为：y=-146.6z+493.5(亲水表面),y=95.45z-209.9(疏水表面)。结论亲水表面试片冰粘附强度随粗糙度的增加而增加,随分形维数的增加而减小,疏水表面试片的变化趋势则相反。冰粘附强度与粗糙度及分形维数之间存在较强的线性关系。表面粗糙度相同的试片经氟硅烷修饰后,冰粘附强度降低,且表面粗糙度越大,冰粘附强度下降越多。

ABSTRACT:Objective To study the effects of test piece surface roughness and fractal dimension on the ice adhesion strength. Methods The different surface microstructure samples were prepared by the process of chemical etching and fluorine silane modif-ying on bare aluminum surface. Surface roughness and fractal dimension of the samples were obtained by measuring surface micro-structure, and surface ice adhesion strength of the samples was measured using ice adhesion strength experimental device. Results The relationship between roughness and adhesion strength was y=1. 0966x+51. 816 (hydrophilic surface),and y=-0. 67x+74. 98 (hydrophobic surface);the relationship between fractal dimension and adhesion strength was y=-146. 6z+493. 5(hydrophilic sur-face), y=95. 45z-209. 9(hydrophobic surface). Conclusion The ice adhesion strength of hydrophilic surfaces increased with the increasing roughness, and decreased with the increasing fractal dimension, while the hydrophobic surfaces showed the opposite changing trends. There was strong linear relationship between the ice adhesion strength and roughness and fractal dimension. For
samples withthe same surface roughness, the ice adhesion strength decreased after fluorinated silane modification, and the greater the surface roughness, the more the ice adhesion strength decreased.