On the use of digital image correlation method for determining the stress field at blunt V-notch neighborhood

•DIC technique is utilized to determine the NSIFs of blunt V-notches experimentally.•Single edge notch tension (SENT) specimen is tested under pure mode I loading.•Material studied is PMMA and various notch geometries are considered in the tests.•Least square approach is used to calculate the NSIFs...

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Bibliographic Details
Published in:Engineering fracture mechanics 2020-01, Vol.223, p.106768, Article 106768
Main Authors: Torabi, A.R., Bahrami, B., Ayatollahi, M.R.
Format: Article
Language:English
Subjects:
Blunt V-notch
Data points
Digital image correlation (DIC) method
Digital imaging
Exact solutions
Finite element method
Mathematical analysis
Mode I loading
Notch stress intensity factor (NSIF)
Notches
Stress distribution
Stress intensity factors
Test procedures
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Summary:•DIC technique is utilized to determine the NSIFs of blunt V-notches experimentally.•Single edge notch tension (SENT) specimen is tested under pure mode I loading.•Material studied is PMMA and various notch geometries are considered in the tests.•Least square approach is used to calculate the NSIFs from the DIC data points.•DIC results are compared to numerical results and good agreement is shown to exist. This paper investigates the ability of digital image correlation method (DIC) in determining accurate stress field around blunt V-notches. The polymeric material of PMMA is selected as the testing material and the well-known specimen of single edge notch tension (SENT) as the testing specimen. The experimental method of DIC is used and pure mode I tests are conducted on blunt V-notched samples with five different notch opening angles and two various notch tip radii. The data points obtained from DIC are used to calculate the notch stress intensity factors (NSIFs). To do so, the experimental data points are fitted to the asymptotic analytical solution of blunt V-notches by using the least square approach. The NSIFs obtained from DIC tests are also compared with those calculated from the finite element (FE) analysis of the specimens and good accuracy of the procedure is proved. Finally, a discussion on the effects of different DIC parameters on the calculated results is presented.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2019.106768