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Digital-Image-Correlation Technique versus Infinitely Small Element Technique for Crack Analysis of Pipe with Crevice

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3 Author(s)
Wen-Pei Sung ; Dept. of Landscape Archit., Nat. Chin-Yi Univ. of Technol., Taichung, Taiwan ; Ming-Hsiang Shih ; Chung-Huan Sui

Conduits of water pipelines are subjected to huge internal pressure for conveying water. Cracks induced by water pollution, material defects and seismic excitation may be forming on a conduit to cause damage. This phenomenon generating stress concentration threatens the safety of a conduit. Thus, techniques to monitor the strain variation of a cracked member are essential. Based on the assumption of linear elastic material, the application of the infinitely small element analysis in a crack problem for numerical simulation was validated. Herein, this research reveals that Digital Image Correlation, DIC, technique is a new manner of surveying the practical strain distribution of a member. By the cracked cylindrical pipe test, the DIC method is used to observe the strain variation in the micro-region surrounding the crack tip. Additionally, to utilize the skills of meshing digital image into subimages increases the precision of analyzing a crack problem via the DIC method. According to the experiment in this research, the capacity of DIC method for capturing a crack progress is validated.

Published in:

Fuzzy Systems and Knowledge Discovery, 2009. FSKD '09. Sixth International Conference on  (Volume:5 )

Date of Conference:

14-16 Aug. 2009

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