Influence of Tailored Waveguides on the Ultrasonic De-Icing Stresses of Aluminum Panels
A new concept to concentrate ultrasonic transverse shear stresses responsible for the ice delamination is introduced in this paper. The concept, described as tailored waveguide structures, is designed to maximize delaminating stresses due to the introduction of discontinuities on a given structure. Discontinuities located on the opposite surface to where ice accretes promote ice interface shear stresses concentrations. These discontinuities allow the shear stresses at the ice/substrate interface to be focused on the specific de-icing areas. The results of finite element analyses presented in this paper show that the interface shear stresses at interface between 12 in. x 12 in. aluminum plates and ice with and without tailored waveguides. The introduction of tailored waveguides creates three to four times greater interface stresses than the ones predicted for equivalent mass structures without tailored waveguide. A parametric study of the tailored waveguide demonstrates that the ice/substrate interface shear stresses double when the spacing between the tailored waveguides is reduced, reaching a steady interface stress when the spacing approaches a certain distance governed by the shape of the structure. De-icing experiments were conducted to validate ice interface predictions modelled at the ultrasonic vibration modes created by a PZT-4 disk with radial resonance frequency of 28.5 kHz.
Yun Zhu Jose L. Palacios Edward C. Smith Joseph L. Rose
国际会议
南京
英文
1-10
2009-10-14（万方平台首次上网日期，不代表论文的发表时间）