给出了它们的弹性刚度常数和压电应力常数。
The elastic stiffness constants and piezoelectric stress constants of these crystals have been obtained.
分析了复合材料面层的弹性常数、泡沫芯层的模量和夹层结构的刚度；
The elastic modulus of foam core and composite skins and the stiffness of sandwich are analyzed.
基于刚度体平均方法，建立了相应的刚度预报模型，得到了三维四向编织复合材料的工程弹性常数。
The model to predict stiffness was then established based on the stiffness volume average method. The elasticity constants of the material were obtained.
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