چکیده مقاله
Digital shearography is a laser interferometry based method that is used to detect defects non destructively by obtaining the surface response of the specimen to the external loading Despite the possibility of estimating the size of defect in this method, access to quantitative information is very difficult In this study, shearography with lock in technique was investigated in order to obtain quantitative depth information For this purpose, planar defects were modeled in different depths and phase images were simulated in different modulation frequencies using finite element method The results showed that the ability to detect defects decreases by increasing the depth of defects Also, defects detectability is improved in lower frequencies By thermal loading withdifferent modulation frequencies, it is possible to control the thermal wave penetration depth, which makes it possible to measure the depth of defect Linear regression showed that there is a correlation between defect depth and the penetration depth related to blind frequency
کلیدواژهها
نویسندگان
Sina Sabbaghi Farshi
Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
Davood Akbari
Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
شیوه ارجاع
Sabbaghi Farshi, Sina and Akbari, Davood,1400,Non-destructive Evaluation of Defects Depth by Lock-in Shearography,4th International Conference on Welding and Non Destructive Testing & 22nd National Conference on Welding & Inspection & 11th National Conference on NDT,Isfahan
ارائهشده در
مجموعه مقالات چهارمین کنفرانس بین المللی جوشکاری و آزمایش های غیرمخرب و بیست و دومین کنفرانس ملی جوش و بازرسی و یازدهمین کنفرانس ملی آزمایش های غیرمخرب18 اسفند 1400 · اصفهان