چكيده به لاتين
The main purpose of this research is to study fracture behavior of bone cement in the presence U-shaped notched under the pure mode I loading by using the equivalent material concept (EMC) and applying linear elastic fracture mechanics of notches. At the EMC is the base of this work, first an appropriate polymeric material is selected. Before testing the notched specimens, finite element simulations were performed to define fracture toughness and the amount of stress created for a given load of 100 N. Therefore, different geometries were simulated in finite element software and analyzed.
In the next step, by using the parameters obtained from simulations, polymeric specimens with notches are made and tested. By using fracture brittle criteria and combining the equivalent material concept to these failure criteria then theoretical results are compared with experimental results. Good predictions are found to exist between them, which shows the ability of the proposed way to predict the experimental results.
In the final section, the process of changes load capacity of the specimens was investigated with the notched radius. In the case of rectangular bone cement samples with a U-shaped notched in the experimental and theoretical way, the load capacity has increased with the increase of the notched radius. In the sample of the Brazilian disk of Iranian material with a U-shaped notched, in the experimental method, with increased radius notched, the load capacity has increased, this can be due to increased plasticity. The process of changing the load capacity of this sample in the theory and the criteria used strongly depends on the amount of critical distance and disk diameter; That is, this critical distance in which section of the tension variation or fracture load chart is in the radius of 1, 2, and 4 mm at different intervals from the head of the notch, and that the larger the diameter of the Brazilian disk is seen far ahead of this disorder. In the sample of the Brazilian disk of French material with a U-shaped notched, in the experimental and theoretical method, with increased radius notched, the load capacity has reduced.
