DeterminingK and related stress-field parameters from displacement fields |
| |
Authors: | D B Barker R J Sanford R Chona |
| |
Institution: | (1) Department of Mechanical Engineering, University of Maryland, 20742 College Park, MD |
| |
Abstract: | A general algorithm is presented that computes the stress-field parameters for opening-mode crack problems in a least-squares
sense from full-field moiré or speckle-displacement fringe patterns. The algorithm can be used in the presence of rigid-body
rotation and does not require absolute fringe numbering. Extensive numerical experiments were conducted with the algorithm
to determine the sensitivity of the method to experimental errors. Small random position errors in locating the fringe maxima
were found to have a negligible influence on the stress-intensity-factor calculation when the number of data points was about
ten times greater than the number of unknown stress-field parameters. It was also found that systematic position errors due
to an incorrectly specified crack-tip location could be minimized by assuming various crack-tip locations in the vicinity
of the actual crack tip and selecting the best fit results. Bothu andv fields were found to be equally suitable for determination of the stress-intensity factor.
Paper was presented at 1983 SESA Spring Meeting held in Cleveland, OH on May 15–19, 1983. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |