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Effect of Geometrical Parameters on Pressure Distributions of Impulse Manufacturing Technologies

Brune, Ryan Carl
http://orcid.org/0000-0002-5842-301X
http://rave.ohiolink.edu/etdc/view?acc_num=osu1480616552913196

Abstract Details

2016, Doctor of Philosophy, Ohio State University, Materials Science and Engineering.
Impulse manufacturing techniques constitute a growing field of methods that utilize high-intensity pressure events to conduct useful mechanical operations. As interest in applying this technology continues to grow, greater understanding must be achieved with respect to output pressure events in both magnitude and distribution. In order to address this need, a novel pressure measurement has been developed called the Profile Indentation Pressure Evaluation (PIPE) method that systematically analyzes indentation patterns created with impulse events. Correlation with quasi-static test data and use of software-assisted analysis techniques allows for colorized pressure maps to be generated for both electromagnetic and vaporizing foil actuator (VFA) impulse forming events. Development of this technique aided introduction of a design method for electromagnetic path actuator systems, where key geometrical variables are considered using a newly developed analysis method, which is called the Path Actuator Proximal Array (PAPA) pressure model. This model considers key current distribution and proximity effects and interprets generated pressure by considering the adjacent conductor surfaces as proximal arrays of individual conductors. According to PIPE output pressure analysis, the PAPA model provides a reliable prediction of generated pressure for path actuator systems as local geometry is changed. Associated mechanical calculations allow for pressure requirements to be calculated for shearing, flanging, and hemming operations, providing a design process for such cases. Additionally, geometry effect is investigated through a formability enhancement study using VFA metalworking techniques. A conical die assembly is utilized with both VFA high velocity and traditional quasi-static test methods on varied Hasek-type sample geometries to elicit strain states consistent with different locations on a forming limit diagram. Digital image correlation techniques are utilized to measure major and minor strains for each sample type to compare limit strain results. Overall testing indicated decreased formability at high velocity for 304 DDQ stainless steel and increased formability at high velocity for 3003-H14 aluminum. Microstructural and fractographic analysis helped dissect and analyze the observed differences in these cases. Overall, these studies comprehensively explore the effects of geometrical parameters on magnitude and distribution of impulse manufacturing generated pressure, establishing key guidelines and models for continued development and implementation in commercial applications.
Glenn Daehn (Advisor)
Alan Luo (Committee Member)
Stephen Niezgoda (Committee Member)
166 p.
Engineering; Materials Science
impulse; manufacturing; high velocity; electromagnetic; vaporizing foil actuator; pressure; design; path actuator; formability; stainless steel; aluminum

Recommended Citations

Citations

  • Brune, R. C. (2016). Effect of Geometrical Parameters on Pressure Distributions of Impulse Manufacturing Technologies [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480616552913196

    APA Style (7th edition)

  • Brune, Ryan. Effect of Geometrical Parameters on Pressure Distributions of Impulse Manufacturing Technologies. 2016. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1480616552913196.

    MLA Style (8th edition)

  • Brune, Ryan. "Effect of Geometrical Parameters on Pressure Distributions of Impulse Manufacturing Technologies." Doctoral dissertation, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480616552913196

    Chicago Manual of Style (17th edition)

osu1480616552913196
531
© 2016, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.