Numerical study and experimental validation of the size effect of smooth and mode I cracked semi-circular bend specimens
The edge-cracked semi-circular bend (SCB) specimen subjected to three-point bending loading is used in many applications to measure the fracture behavior of quasi-brittle materials. The main objective of the present work was to study the effect of the crack length to SCB specimen radius ratio ( a/R...
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Veröffentlicht in: | Scientific reports 2023-05, Vol.13 (1), p.7570-7570, Article 7570 |
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Sprache: | eng |
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Zusammenfassung: | The edge-cracked semi-circular bend (SCB) specimen subjected to three-point bending loading is used in many applications to measure the fracture behavior of quasi-brittle materials. The main objective of the present work was to study the effect of the crack length to SCB specimen radius ratio (
a/R
), span to specimen diameter ratio (
S/D
), and specimen size on its flexural and mode I crack growth behavior. The contour integral method was implemented using the 3-D finite element method to determine the mode I stress intensity factor. In addition, high-strength concrete specimens were experimentally studied to validate the numerical results. The results show that the maximum compression stress is not sensitive to the
S/D
value, while the tensile stress is very sensitive. The value of
S/D
is the main parameter controlling the crack driving force (i.e., the crack mouth opening displacement (CMOD) and the normalized stress intensity factor,
Y
I
). For the same
S/D
, the SCB specimen diameter value change has a marginal effect on CMOD and
Y
I.
The specimen with
S/D
= 0.8 showed that it is the most compatible specimen with three-point bending test conditions, regardless of the SCB specimen size. A good agreement between the numerical and experimental results was achieved. |
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ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/s41598-023-34201-z |