Topsolid 2012 Crack REPACK
in the fifth experimental condition (1/0/0/0/1/0/1) the ultrasonic loading is applied to the samples with primary cracks (5/0/0/0/1/0/1) and the tensile strength increases (compared to the sample with primary cracks without ultrasonic loading). the percentage of the primary cracks also increases, which means the ultrasonic loading causes the cracks to become more numerous and larger. the increase in tensile strength in the sample with primary cracks is higher than in the third experimental condition (1/0/0/0/0/1/1) (see the first column in figure 10).
the next objective of this study was to find out the influence of the applied ultrasonic power on the crack propagation. on the one hand, the results of the experiments that ultrasonic power were applied to the electrolyte are in complete contrast with the results of the previous experiment. the applied ultrasonic power is in the range of 0 w to 100 w. in the case of an application of 50 w of ultrasonic power, an increase of 15% is measured in relation to the previous experiment that only ultrasonic loading was applied. this can be explained by the fact that the application of ultrasonic power causes the relaxation of the surface oxide film and it becomes more permeable to electrons and the crack propagation is accelerated. the increase of the ultrasonic power from 50 w to 100 w causes an increase of 10% in the number of cracks in relation to the previous experiment.
the last objective of this study was to find out the effect of the application of ultrasonic power on the size of the primary cracks. in this experiment (0/1/0/0/0/0/1) the crack is recorded at the depth of 50 µm. the next objective of this study was to find out the effect of the process parameters on the size of the primary cracks. in this experiment (0/0/0/0/0/0/1) the ultrasonic power was applied to the electrolyte and the amount of air applied to the electrolyte was increased by 0.5 ml/min. by increasing the amount of air by 0.5 ml/min, the crack propagation and the size of the cracks were increased by more than 12%. in all cases, the primary cracks have a tree shape morphology, but as the amount of air applied to the electrolyte is increased, the crack size is increased. this is because the applied ultrasonic power causes the relaxation of the surface oxide film which becomes more permeable to electrons. this phenomenon decreases the resistance to the propagation of the primary crack and the crack size increases. 3d9ccd7d82
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