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固体的泊松比是一个很重要的弹性常数.对于压电陶瓷,在测定它的压电性能和弹性性能时,通常是将材料做成薄圆片子,然后利用径向振动来测算S_(11)~E,K_p,d_(31)等等基本物理常数,而这些常数的计算公式中都包含着泊松比σ这个量.因此,要测定这些常数,有必要先测准σ.随着新压电陶瓷的不断出现,特别是锆酸钛酸铅类陶瓷的出现,泊松比已超过0.350 ,根据我们目前了解,还有达0.420的.这样,如果对σ只作随便估计,则对于S_(11)~E,K_p,d_(31)等量有可能引起甚至大于10％的误差.测定σ的方法很多,但是在目前问题中,重要的是如何从薄圆片子本身准确测出σ值来.
Solid Poisson’s ratio is a very important elastic constant. For the piezoelectric ceramics, in the determination of its piezoelectric properties and elastic properties, the material is usually made of thin disc, and then use radial vibration to calculate S_ (11 ) ~ E, K_p, d_ (31), and so on, which are all included in the calculation formula of Poisson’s ratio σ Therefore, it is necessary to measure σ before measuring these constants Piezoelectric ceramics continue to emerge, especially the emergence of lead zirconate titanate ceramics, Poisson’s ratio has more than 0.350, according to our current understanding, there are up to 0.420.And so, if only σ for random estimates, then S_ (11) ~E, K_p, and d_ (31) may cause an error of even greater than 10%. There are many ways to measure σ, but in the current problem, it is important to accurately measure σ from the wafer itself Come.