中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2014年
10期
1337-1340,1368
,共5页
激光超声%热弹性%EMAT%裂纹检测%阴影法
激光超聲%熱彈性%EMAT%裂紋檢測%陰影法
격광초성%열탄성%EMAT%렬문검측%음영법
laser ultrasound%thermo-elastic regime%electromagnetic acoustic transducer(EMAT)%inspection of crack%shadow method
为检测内裂纹，建立了一套基于脉冲激光激发、电磁超声探头接收的非接触型超声检测系统。为避免在试件表面产生烧蚀损伤，采用热弹性模式激发超声，采用 EMAT探头接收信号。利用出平面EMAT探头和内平面EMAT探头，分别研究了横波与纵波在半圆铝制试块的传播情况。最后，结合阴影法，使用该试验系统测量了试件背面的裂纹，检测得到的裂纹深度与实际深度非常接近。证明在热弹性模式下，激光激发、EMAT探头接收信号的方法对于内裂纹的检测是可行的。
為檢測內裂紋，建立瞭一套基于脈遲激光激髮、電磁超聲探頭接收的非接觸型超聲檢測繫統。為避免在試件錶麵產生燒蝕損傷，採用熱彈性模式激髮超聲，採用 EMAT探頭接收信號。利用齣平麵EMAT探頭和內平麵EMAT探頭，分彆研究瞭橫波與縱波在半圓鋁製試塊的傳播情況。最後，結閤陰影法，使用該試驗繫統測量瞭試件揹麵的裂紋，檢測得到的裂紋深度與實際深度非常接近。證明在熱彈性模式下，激光激髮、EMAT探頭接收信號的方法對于內裂紋的檢測是可行的。
위검측내렬문，건립료일투기우맥충격광격발、전자초성탐두접수적비접촉형초성검측계통。위피면재시건표면산생소식손상，채용열탄성모식격발초성，채용 EMAT탐두접수신호。이용출평면EMAT탐두화내평면EMAT탐두，분별연구료횡파여종파재반원려제시괴적전파정황。최후，결합음영법，사용해시험계통측량료시건배면적렬문，검측득도적렬문심도여실제심도비상접근。증명재열탄성모식하，격광격발、EMAT탐두접수신호적방법대우내렬문적검측시가행적。
A non-contact ultrasonic testing system using a pulsed laser for ultrasound generation and an EMAT for ultrasound detection were developed for the inner crack inspection.To avoid the la-ser-induced ablation damage on the specimen,thermo-elastic model was used to excite ultrasound, the EMAT probe was used to receive signals.The EMAT in plane and EMAT out of plane were used to study the transversed wave and longitudinal wave spreading in the half aluminum test block respec-tively.Finally,combining the shadow method,the test system was used to measure the crack on the back of the specimen,the crack depth and the actual depth are very close.It is shown that,in the ther-moelastic mode,the laser excitation,the method for EMAT probe received signals are feasible in the inspection of cracks.
