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Experimental Study of Air Blast and Water Shock Loading on Automotive Body Panels

Gardner, Kevin Alexander
http://rave.ohiolink.edu/etdc/view?acc_num=osu1468938824

Abstract Details

2016, Doctor of Philosophy, Ohio State University, Mechanical Engineering.
Analytical solutions to fluid-structure interaction (FSI) problems provide a powerful design tool that has many applications within the automotive industry. The interaction of body panels with various fluid flows is of interest. Automotive panels that are made too thin become susceptible to a phenomenon known as oil-canning. The deformation can be temporary, or if the loading is large enough the panel can snap through, possibly resulting in permanent deformation. One common occurrence of oil-canning is when going through the dryer section of an automatic car wash. For small deformations the panel can shift between various unstable elastic configurations resulting in loud popping noises within the passenger compartment. Large deformations can result in permanent deformation and pitting of the roof panel. Automotive underbody panels are susceptible to water shock loadings that can be generated when driving over a puddle at high speeds. Panels that are made too thin can be permanently deformed or even fail in some cases when the water shock loading is strong enough. Accurate simulations of these scenarios are of interest since thinning body panels provides an easy way to realize significant weight reduction and increase fuel economy. An experimental program is introduced where full size automotive roof panels are subjected to air blast loading. The panels are stamped from thin alloy sheet steel. Roof panels are loaded into a custom test rig and clamped along the weld flanges. The air blast is generated using a commercial air compressor and a 35.1 mm pipe. Force imparted on the panel by the air jet is measured by three load cells and full-field displacement data is captured using three-dimensional digital image correlation (DIC). The flow field is characterized using piezo-resistive pressure transducers placed in a sensor bar apparatus that can be swept across the flow field to generate pressure maps. The pressure transducers are also mounted to the roof panels to record surface pressures during testing. Water jet experiments are performed on automotive underbody panels stamped from thin aluminum sheet. The panels are bolted into a custom test rig and the water jet loading is generated with a commercial pressure washer. The force on the panels is measured with four load cells and full-field displacement data is obtained from the back side of the panel using three-dimensional digital image correlation. The flow field is characterized through the use of high speed cameras mounted orthogonally to obtain jet velocity measurements and qualitative properties. Additional experiments are performed on the underbody panels using a water cannon that fires a slug of water contained within a latex balloon at high velocity in an effort to more accurately recreate a water splash event and permanently deform the underbody panels. The velocity and qualitative properties of the water slugs are measured using orthogonally mounted high speed cameras. Concurrent simulations will be performed by Honda R&D Americas, Inc. and compared to the experimental data from this study to assess the validity of the numerical results.
Amos Gilat (Advisor)
Briam Harper (Committee Member)
Chia-Hsiang Menq (Committee Member)
Mo-How Shen (Committee Member)
268 p.
Mechanical Engineering
Experimental mechanics; fluid structure interaction; dynamic behavior of materials; computational mechanics

Recommended Citations

Citations

  • Gardner, K. A. (2016). Experimental Study of Air Blast and Water Shock Loading on Automotive Body Panels [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1468938824

    APA Style (7th edition)

  • Gardner, Kevin. Experimental Study of Air Blast and Water Shock Loading on Automotive Body Panels. 2016. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1468938824.

    MLA Style (8th edition)

  • Gardner, Kevin. "Experimental Study of Air Blast and Water Shock Loading on Automotive Body Panels." Doctoral dissertation, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1468938824

    Chicago Manual of Style (17th edition)

osu1468938824
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This open access ETD is published by The Ohio State University and OhioLINK.