冰力学参数的超声波测试研究

摘要

Nonlinear high-energy ultrasonic testing equipment and the relationship between ultrasonic wave velocity ( lon-gitudinal 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 tem-peratures .Using MATLAB for data processing , the relationship between the velocity of ultrasonic waves in the arti-ficial ice samples and the variation of ice temperature was obtained .Then, using a theoretical formula , the relation-ship between the variations of the mechanical parameters of the artificial ice samples with temperature was deter -mined.The results showed that both the longitudinal and the shear waves displayed an increasing trend with decrea -sing temperature.Furthermore, the Young’s modulus, Poisson’s factor, shear modulus, and bulk modulus, cal-culated from the experimental data of the artificial ice samples , were also found to increase with decreasing temper-ature.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 .%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。