冰力学参数的超声波测试研究

利用非线性高能超声测试设备及超声波(纵波、横波)波速与物体力学参数的关系,对人造冰样进行了冰样力学参数(杨氏模量、泊松比、剪切模量、体积模量)随温度变化的研究。通过MATLAB进行所测数据曲线拟合,得到超声波波速在人造冰样中随温度的变化规律,进而由理论公式推导所测人造冰样力学参数随温度的变化规律。结果表明:冰样中超声波波速随温度降低而升高,冰样的杨氏模量、泊松比、剪切模量、体积模量也都随温度降低而升高。本研究有助于超声波检测法在冰样物理力学性质测量中的应用,为开展南极冰盖、海冰以及终年冻土等力学及流动特性研究提供理论模型和实验数据。

STUDY OF ULTRASONIC TEST IN THE MEASUREMENTS OF MECHANICAL PROPERTIES OF ICE

Nonlinear high-energy ultrasonic testing equipment and the relationship between ultrasonic wave velocity (longitudinal and shear waves) and mechanical parameters of objects were used to study the mechanical parameters (Young’s modulus, Poisson’s factor, shear modulus, bulk modulus) of artificial ice samples under varying temperatures. Using MATLAB for data processing, the relationship between the velocity of ultrasonic waves in the artificial ice samples and the variation of ice temperature was obtained. Then, using a theoretical formula, the relationship between the variations of the mechanical parameters of the artificial ice samples with temperature was determined. The results showed that both the longitudinal and the shear waves displayed an increasing trend with decreasing temperature. Furthermore, the Young’s modulus, Poisson’s factor, shear modulus, and bulk modulus, calculated from the experimental data of the artificial ice samples, were also found to increase with decreasing temperature. This research promotes the application of ultrasonic detection techniques for the measurements of the physical and mechanical properties of ice, and it provides theoretical models and experimental data for undertaking research into the mechanical and flow characteristics of the Antarctic ice sheet, sea ice, and permafrost.