Transactions of the Japan Society of Mechanical Engineers Series A
Online ISSN : 1884-8338
Print ISSN : 0387-5008
Fracture Behavior Observation of Wall-Thinned Pipes by Image Strain Measurement System
Masataka TSUJIToshiyuki MESHII
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2010 Volume 76 Issue 772 Pages 1667-1673

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Abstract

This paper describes fracture behavior evaluation of wall-thinned pipes by image processing strain measurement system. Regular grids with nominal size of 10×10mm were marked on the 100 A carbon steel pipes and the images taken with 6 CCD cameras of 15 million pixels were correlated to realize resolution of 0.3% strain. Strain of the cylinder outer surface was evaluated by 1) modeling the grids as a cylindrical shell, 2) measuring deformation of the grid on a projected plane, and 3) by applying updated Lagrangian method. The results indicate that the method is effective for analyzing fracture modes and fracture criterions.

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© 2010 The Japan Society of Mechanical Engineers
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