低温下での氷の機械的特性と付着強度に関する研究

抄録

Icing is one of important problems that have to be prevented in jet engine of airplane. If thin ice layer deposited on the surface of blade is detached in fight, the debris is scattered and then impacts to a rear stage blade. Such impact of the debris could lead to catastrophic fracture of the blades. Numerical simulation is a powerful tool to understand how the icing is grown and detached. Thus, the icing phenomenon has been focused on the point of view from fluid mechanics. However, fundamental knowledge for mechanical property of ice itself and the adhesion of the ice layer is still very poor. The aim of this study is to examine about the mechanical property including Young's modulus, fracture toughness and adhesive strength at a low temperature. First of all, as a result of bending test on ice, it was found that the Young's modulus and fracture toughness of ice was increased as ambient temperature being low and loading speed being increased. Then, a shear force test was performed using ice/aluminum alloy to evaluate the interfacial fracture toughness as adhesive strength. As a result, the interfacial fracture toughness was decreased as ambient temperature being low and loading speed being increased. Based on those results, it is concluded that the mechanical property and adhesive strength are strongly affected by ambient temperature and loading speed.