Test specimens shall be taken after all non-destructive testing (NDT) has been carried out and which has passed the relevant inspection criteria for the NDT method(s) used.
试样的截取应在所有非破坏性试验（NDT）已经完成并已经通过所用NDT方法的相关检查依据后进行。
2
The popular nondestructivetest methods for the foam-cored sandwich structure are reviewed; including air coupled ultrasonic method, pulse-echo ultrasonic method and shearogragh method.
回顾了泡沫夹层结构常用的无损检测方法：空气耦合超声方法、脉冲回波超声方法以及激光错位散斑干涉方法。
3
The testmethod employed is non-destructive, so that only one model is needed for investigating stresses in a rotating disc at various speeds, and for determining the static shrink fit stresses.