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SPECIAL SECTION PAPERS

Failure Loading of Metallic and Composite Cylinders Under Internal Pressure Loading

[+] Author and Article Information
Y. W. Kwon, T. Ponshock

Department of Mechanical and
Aerospace Engineering,
Naval Postgraduate School,
Monterey, CA 93943

J. D. Molitoris

Lawrence Livermore National Laboratory,
Livermore, CA 94551

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 15, 2016; final manuscript received May 27, 2016; published online July 18, 2016. Assoc. Editor: Pierre Mertiny.This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Approved for public release; distribution is unlimited.

J. Pressure Vessel Technol 138(6), 060903 (Jul 18, 2016) (8 pages) Paper No: PVT-16-1010; doi: 10.1115/1.4033772 History: Received January 15, 2016; Revised May 27, 2016

A new mechanical device was developed to apply internal pressure loading to a cylindrical structure in order to determine its failure strength and failure mode under pressure loading. The device can be used for a uniaxial testing machine to apply internal pressure to a cylindrical structure. As a result, the developed device does not require any fluid to generate internal pressure loading. The device consists of two truncated conical shape of rams and eight pieces of the identical shape of wedges. The effectiveness of the device was assessed using both detailed finite element analyses of metallic cylinders as well as the analytical analysis. Then, a set of experimental tests were undertaken for aluminum alloy cylinders in order to evaluate experimental failure strength against the numerical and analytical results. Finally, composite cylinders made of glass-fiber or carbon-fiber woven fabrics were tested using the device, and the experimental results were compared to the predicted results using a multiscale analysis model. Those results agreed well with each other.

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Figures

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Fig. 1

Mechanical testing device to apply internal pressure: (a) cross-sectional view and (b) three-dimensional view

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Fig. 2

Finite element meth of the mechanical device and aluminum cylinder

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Fig. 3

Plot of FEA hoop strain variation along the arc of each wedge for three different target hoop strains

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Fig. 4

Free-body diagrams: (a) ram and (b) wedge

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Fig. 5

E-glass fiber (left) and carbon-fiber (right) composite cylinders

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Fig. 6

Schematic of multiscale analysis of woven fabric composite structure

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Fig. 7

Unit cell model for fibrous composite

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Fig. 8

Unit cell model for plain weave fabric composite

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Fig. 9

Applied force versus strain for aluminum cylinders

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Fig. 10

Comparison of experimental and FEA results for aluminum cylinders using friction coefficient of 0.12

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Fig. 11

Failed aluminum cylinder

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Fig. 12

Tensile stress–strain curve of CFC specimen

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Fig. 13

Force–strain plot for CFC cylinder

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Fig. 14

Force–strain plot for GFC cylinders

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