Whiting R, Jacobsen P H
J Dent Res. 1980 Nov;59(11):1978-84. doi: 10.1177/00220345800590110901.
An ultrasonic pulse transit-time method was used to determine the Young's modulus, shear modulus, and Poisson's ratio of seven anterior-restorative materials. Small rectangular specimens were immersed in a water bath and ultrasonic pulses propagated through them. Two types of ultrasonic wave could be generated inside the specimen by altering the angle of incidence. Measurement of the pulse transit-time for these two waves enabled their velocities and, hence, the material's elastic constants to be calculated. The variation of these properties with time of conditioning and temperature was also determined.
采用超声脉冲传播时间法测定了七种前牙修复材料的杨氏模量、剪切模量和泊松比。将小矩形试样浸入水浴中，超声脉冲在其中传播。通过改变入射角，可在试样内部产生两种类型的超声波。测量这两种波的脉冲传播时间，就能计算出它们的速度，进而计算出材料的弹性常数。还测定了这些性能随老化时间和温度的变化情况。
