Study on Thickness Effect of Three-Point-Bend Specimen

Abstract

The thickness effect of a three-point-bend (3PB) specimen on dimple fracture behavior is studied experimentally and numerically. At first, fracture toughness tests were conducted using 3PB specimens of different thicknesses. Fracture toughness values and R-curves are obtained, and the thickness effect is discussed. Using scanning electron microscopy (SEM), dimple fracture surfaces are observed precisely. It is found that the thickness effect appears clearly in the void growth process. Finite element (FEM) analyses are conducted based on these experimental data. Using Gurson's constitutive equation, the nucleation and growth of voids during the dimple fracture process are simulated. The distribution patterns of stress triaxiality and the crack growth process are obtained. The results show a good agreement with experimental ones qualitatively. The effects of specimen thickness on R-curves are explained well on the basis of these numerical simulations.

The Effect ofCeratonia siliquaSupplement on Bone Mineral Density in Ovariectomy-induced Osteoporosis in Rats

“…Cortical bone thickness exhibited the greatest association with failure load in the same study. It has also been reported that dimple fracture is affected by bone thickness (97). This highlights the significance of the three-point bending test result that administration of C. siliqua significantly increased the thickness index compared to the OVX group for the right femur, even though it remained significantly lower compared to the control group when the index was examined regardless of the foot factor.…”