Capability of Digital Shearography in Crack Defect Inspection
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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
This article introduces and reviews Digital Shearography applications in the detection and measurement of crack type defects, as well as the history of activities performed in this career. Digital Shearography is a laser light-based NDT method for full-field and non-contact measurement of an object's deformation (surface displacement derivatives). This method is equivalent to a full-area strain gauge that allows you to observe the strain distribution over a large area. Shearography is used to inspect and non-destructive evaluation of different materials. However, due to the limitations of traditional methods in inspecting some materials, such as composites, and the increasing use of these materials in sensitive industries such as aerospace and military, shearography is increasingly being considered. With regard to understanding the significance and influences of the shape and geometry of defects in Shearography results, this article attempts to prove and introduce Digital Shearography as a superior method in the field of both quantitative and qualitative evaluation of sub-cracks in various materials by reviewing previous studies and researches. The results show that loading, shearing amount and direction, crack length, depth, and angle have the greatest influence on the shape of the fringe patterns. Shearography ability to estimate crack geometry has also been demonstrated and proven. For this purpose, previous studies have been reviewed after presenting the principles and foundations of the digital Shearography method.
Language:
Persian
Published:
Iranian socciety for nondestructive testing, Volume:2 Issue: 8, 2021
Pages:
41 to 61
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