چکیده مقاله
Digital shearography test is an optical and full field method that improves the ability to identify defects with the help of image processing methods In this method, the displacement derivatives are obtained directly from the fringe patterns, which require the extraction of phase information from the image One of the most important parameters of the shearography method is shear distance, choosing an inappropriate shear distance, makes the procedure of detection impossible by considering different shear distances along a curved surface contrary to a flat surface, it would be necessary to consider the correct shear distance to achieve a better result A lot of workpieces and parts especially in petroleum industry and Aerospace have a curved surface, whereas defect detection is a crucial and important matter in these areas, it must be considering that some defects cannot be seen or detected by implementing just flat surfaces’ experiment procedure, thus some correction must be applied to tests In this paper corrosion defect as a common de fect in pipes has been studied and in pvc pipes experimented Effect of angle on observation and also on shear distance has been studied Comparison between zero degree and maximum angle which could be implemented has been conducted
کلیدواژهها
نویسندگان
Shobeir Ghobadi
MSc Student, Faculty of mechanical engineering, Tarbiat modares university, Tehran, Iran
Davood Akbari
Asstistant Professor, Faculty of Mechanical Eng , Tarbiat Modares University, Tehran, Iran
Mohammad Tizmaghz Nejad
MSc Student, Faculty of mechanical engineering, Tarbiat modares university, Tehran, Iran
شیوه ارجاع
Ghobadi, Shobeir and Akbari, Davood and Tizmaghz Nejad, Mohammad,1399,Effect of shear distance on the shearography fringe patterns in the PVC curved surfaces,17th National Conference and 6th International Conference on Manufacturing Engineering,Tehran
ارائهشده در
مجموعه مقالات هفدهمین همایش ملی و ششمین کنفرانس بین المللی مهندسی ساخت و تولید12 اسفند 1399 · تهران