A novel bending approach for crack determination and location

• Main Author: Wong, Wei Song
• Other Authors: Lye Sun Woh
• Format: Final Year Project
• Language: English
• Published: 2018
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/74711
• Institution: Nanyang Technological University

The objective of this project is to determine and test a new non-destructive method of crack detection on aircraft structures. The method used was to observing minute deflection in structures with and without cracks. Three point bending tests using SAE 304 stainless steel plates with machined cracks were studied. Theoretical deflection of the plate was derived using standard formula for uniform load and point load and compared to experimental deflection of the plate with loads keeping the material in its plastic region. Plates with and without existing cracks were measured for deflection at various points when subjected to loading followed by machining a crack along the material. Subsequently, post-crack deflection values were compared against its pre-crack deflection values to verify the assumption that a change in value indicates a change in material condition. Finally, limitations of the experiment were discussed and possible future work such as use of other materials and accuracy and size of crack detection were recommended