![]() ![]() 15 used a weight function method to predict a SIF and CMOD of SCB. They have concluded that the SIF is not as sensitive to variations in SCB specimen geometry at a short crack length. They saw that the mode II SIF becomes increasingly dominant as the support span length is reduced or when the crack angle and length are increased. 14 studied the effect of a/R, span to specimen diameter ratio ( S/D), and crack orientation on the SIF of SCB specimens under three-point bending testing. Furthermore, the SIFs become very sensitive at the large crack length to SCB specimen radius ratio ( a/R) values 8. Crack length appears to be a more significant factor than the specimen thickness on the SIF 13. Its orientation concerns the loading direction and the distance between the supports 11, 12, as shown in Fig. The mixed-mode SIF is a function of the crack length ratio a/R. 10 recently improved the SCB specimen to obtain a ductile adhesive’s mixed-mode fracture behavior with a considerable fracture process zone ahead of the crack tip. Furthermore, it has a simple geometry and test procedure for calculating mixed mode I–II fracture toughness 7, 8, 9. The main advantage of using the SCB specimen is that it can easily be taken from the cores of any material 6. The edge-cracked semi-circular bend (SCB) specimen under three-point bending loading is used to measure the material fracture behavior of rock materials, concrete, asphalt mixtures, and biomaterials 1, 2, 3, 4, 5. A good agreement between the numerical and experimental results was achieved. 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. For the same S/D, the SCB specimen diameter value change has a marginal effect on CMOD and Y I. 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). The results show that the maximum compression stress is not sensitive to the S/D value, while the tensile stress is very sensitive. In addition, high-strength concrete specimens were experimentally studied to validate the numerical results. The contour integral method was implemented using the 3-D finite element method to determine the mode I stress intensity factor. ![]() 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 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. ![]()
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