Investigating The Effect Of Ultrasonic Vibration Variables On Microstructures And Mechanical Properties

Investigating The Effect Of Ultrasonic Vibration Variables On Microstructures And Mechanical Properties

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7.3. Task 3: Investigating the effects of ultrasonic vibration variables on microstructures and mechanical properties.
7.3.1. Research question generation from preliminary results and the literature
All the preliminary investigations of UV-A LENS were conducted under the same combination of ultrasonic vibration variables. Ultrasonic vibration affected microstructures and mechanical properties (see Figures 7-9). In UV-A manufacturing processes, amplitude, frequency, and direction are three basic variables of ultrasonic vibration, which can affect most output variables. Other important variables of ultrasonic vibration, such as ultrasonic power and intensity, are related to these three basic variables. Ultrasonic intensity, the amount of energy passing through per unit cross-section area and time (as known as power per unit area in W/mm2, Intensity = Power / Area), is proportional to the square of the amplitude and changes with direction of ultrasonic vibration changing. Cavitation value is the minimal ultrasonic intensity that generates cavitation actions in liquid media. In other words, the applied ultrasonic intensity should be higher than the cavitation value of a liquid to generate the cavitation actions [52]. In addition, effective acoustic streaming actions in liquid materials can be generated by a high enough ultrasonic intensity [84]. However, too high ultrasonic intensity can continuously break and re-melt dendrite structures, making recrystallization process slower, solidification process longer, and crystal structure larger [52]. The cavitation value is also related to the ultrasonic frequency. Higher frequency leads to a larger cavitation value, which makes the liquid difficult to generate the cavitation. After the cavi...

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...AM processes, introduction posters for high school, undergraduates students, and general audiences, research posters (including experimental results from this project) for graduate students, faculties, and researchers. The exhibition will last two weeks in Years 2-3 of this project. Advertisements will be made through websites of the museum and IE department. After that, the exhibition will move to advanced manufacturing teaching lab at IE department to operate a two-week summer workshop in Years 4-5. The IE department will support the PI for exhibition and workshop development (see department chair’s letter in supplement document). The workshop will be continuously operated once per year after Year 5. The exhibition and workshop can educate the K-12 students and undergraduates with general AM knowledge and deliver the findings to the other faculties and researchers.

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