用超声波确定应力强度因子时对波型的选择  

Requirement for Wave-mode to Determine Stress Intensity Factor by Ultrasonic Wave

作　　者：张忠平[1] 车俊[1] 刘志毅[1] 杨尊袍[1] 张建邦[1] 

机构地区：[1]空军工程大学工程学院,陕西西安710038

出　　处：《空军工程大学学报（自然科学版）》2001年第2期64-66,共3页Journal of Air Force Engineering University(Natural Science Edition)

摘　　要：利用与超声纵波相应的材料声折射率和应力强度因子的关系 ,并考虑到横波、纵波在材料中的传播速度及其与入射角、反射角的关系 ,研究了用超声波确定应力强度因子时对波型的选择。发现 :一列超声纵波入射于含裂纹的受力试件表面时 ,由于反射与折射 ,将有两列超声纵波透过试件后表面 ,四列超声纵波穿出试件前表面。要用超声波确定应力强度因子 ,只能采用透出试件前(或后 )The requirement for wave-mode to determine stress intensity factor (SIF) by ultrasonic wave is studied. The relationship between SIF and acoustic refractive index corresponding to longitudinal wave is used. The propagating velocities of both transverse and longitudinal waves in specimen and the refractive law are taken into account. It is found that, if a beam of ultrasonic longitudinal wave incidents upon the front surface of a loaded specimen with crack, two beams of ultrasonic longitudinal waves will pass through the rear surface of the specimen and four beams of them will pass through the front surface of the specimen since the reflection and the refraction. So, if ultrasonic wave is used to determine SIF, only the first one passing through the front (or rear) surface of the specimen can be used.

关 键 词：应力强度因子 超声纵波 声速 波型转换 声折射率 超声无损评价 

分 类 号：TB553[理学—物理]