The main purpose of this study was to determine the impulse of a bubble on a solid surface or the amount of energy transmitted to the surface by the bubble. To do this, the results of previous numerical studies were used to derive a relationship between the speed of microjet and acoustic pressure amplitude. It was found that the speed of microjet is proportional to the logarithm of the acoustic pressure amplitude. Aluminium foil specimens were exposed to cavitation for 3 s and the dimensions of pits generated on specimens were measured. Then, the deformation energy of each pit and the corresponding impulse were calculated. The trend of experimental results was in a good agreement with the theoretical ones but their exact values were not.
The main purpose of this study was to determine the impulse of a bubble on a solid surface or the amount of energy transmitted to the surface by the bubble. To do this, the results of previous numerical studies were used to derive a relationship between the speed of microjet and acoustic pressure amplitude. It was found that the speed of microjet is proportional to the logarithm of the acoustic pressure amplitude. Aluminium foil specimens were exposed to cavitation for 3 s and the dimensions of pits generated on specimens were measured. Then, the deformation energy of each pit and the corresponding impulse were calculated. The trend of experimental results was in a good agreement with the theoretical ones but their exact values were not.
Bending is one of the processes frequently used during manufacturing of sheet-metal components. Spring-back in bending operations is an important issue when producing precision parts. This issue becomes even more important when the component has any kind of hole on the bending surface. Such components are the focus of study in this paper. Many parameters affect spring-back in the bending process; in the present work, perforated components with an oblong cut are selected, and the influence of cut size, die radius, clearance, and component material on the value of the spring-back in a wipe-bending process are studied. Four different hole sizes, three die radii and clearance, and two different steel materials (high-strength low-alloy steel and low-carbon steel) are used in experiments and finite-element simulations. Results show these parameters have effect on the amount of spring-back in the wipe-bending process.
The roll bending of sheet metals which rest on a rubber pad has only recently been studied scientifically and is dealt with in the present work. In this process, three different zones can be distinguished along the sheet metal profile, including the undeformed zone, the elastic zone, and the plastic zone. The governing differential equations of the deformation zones were investigated for the elastic and plastic bending of the sheet. The equations were solved analytically for elastic bending and analytically-numerically for plastic bending. The effects of the process parameters were then investigated. The elastic-plastic bending solution was verified by experiments.
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