Experimental determination of the notch stress intensity factor for sharp V-notched specimens by using the digital image correlation method

•DIC method is used to determine the notch stress intensity factor of sharp V-notch.•Two different specimens are tested under pure opening mode via tension and bending.•Material examined is PMMA and various V-notch angles are considered in the tests.•Over-deterministic method is employed to derive t...

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Bibliographic Details
Published in:Theoretical and applied fracture mechanics 2019-10, Vol.103, p.102244, Article 102244
Main Authors: Torabi, A.R., Bahrami, B., Ayatollahi, M.R.
Format: Article
Language:English
Subjects:
Digital image correlation (DIC) method
Digital imaging
Displacement
Mode I loading condition
Notch stress intensity factor
Polymethyl methacrylate
Sharp V-notch
Stress distribution
Stress intensity factors
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Summary:•DIC method is used to determine the notch stress intensity factor of sharp V-notch.•Two different specimens are tested under pure opening mode via tension and bending.•Material examined is PMMA and various V-notch angles are considered in the tests.•Over-deterministic method is employed to derive the notch stress intensity factor.•Results are compared with those already published and good agreement is revealed. Digital image correlation (DIC) method is used to experimentally determine the notch stress intensity factor for sharp V-notched samples under mode I loading conditions. First, two well-known test specimens, namely the single edge notch tension (SENT) and the single edge notch bending (SENB) specimens are chosen. The specimens are made of Polymethyl-methacrylate (PMMA) and for each specimen, five different notch opening angles are considered. Then, the experimental displacement fields in the specimens are derived by using DIC method. Afterward, the over-deterministic method is employed to derive the mode I notch stress intensity factors for the samples tested. According to the over-deterministic method, the analytical displacement field is fitted to a large amount of experimentally obtained local displacement values. Finally, the results obtained from DIC are compared with the results available in the literature. The good accuracy of the results obtained demonstrates the ability of DIC method in derivation of the stress field for sharp V-notched structures.
ISSN:0167-8442
1872-7638
DOI:10.1016/j.tafmec.2019.102244