Effect of specimen thickness on mode I stress intensity factor in photoelastic investigations

✍ Scribed by N.Srinivasa Murthy; N. Rakesh; L.S. Srinath

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 244 KB
• Volume: 18
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(83)90013-9

✦ Synopsis

FOR THE determination of Mode I S.I.F for cracks and geometrical discontinuities in three dimensional photoelastic models, the usual practice is to freeze or lock the stresses in the model and analyse a slice containing the region of interest cut from the model. While several methods have been proposed to determine the S.1.F from the photoelastic data pertaining to a given slice, there are two open questions. These are: (i) What should be the acceptable thickness of the slice in order to obtain a satisfactory or consistent value for S.1.F from photoelastic data? (ii) What is the domain (i.e. the radial distance from the notch tip) within which the observed photoelastic data give reasonably consistent values for S.I.F? In this brief note, some of the findings pertaining to the above questions are reported. Among the host of equations and methods proposed by different investigators, the commonly used ones are those suggested by Irwin[l]. Referring to Fig. I. the equations are: K, % % 3% 7^Y=d2nr = sm -2 cos -2 cos -. 2