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.
Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instruction, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to ABSTRACT (maximum 200 words)A mechanical device and associated testing procedure were developed to apply internal pressure to open-ended cylinders for determination of various properties, including burst pressure, elastic modulus, and Poisson's ratio. ANSYS finite element analysis software was used to model the operation of the device with aluminum cylinders. Analytic equations for thin and thick cylinders were used to validate the computer model results. Initial mechanical testing was performed with aluminum cylinders to verify results against the finite element model. Glass and carbon fiber composite cylinders were fabricated and tested to failure with the device and the aforementioned properties were found. Finally, carbon fiber composite tensile specimens of the dog-bone shape were tested to failure to compare material properties with those found from the cylinder tests. The test device and methods developed in this research support Lawrence Livermore National Laboratory and the Defense Threat Reduction Agency in the development of the Agent Defeat Penetrator, a next-generation agent defeat weapon. SUBJECT TERMS ABSTRACTA mechanical device and associated testing procedure were developed to applyinternal pressure to open-ended cylinders for determination of various properties, including burst pressure, elastic modulus, and Poisson's ratio. ANSYS finite element analysis software was used to model the operation of the device with aluminum cylinders.Analytic equations for thin and thick cylinders were used to validate the computer model results. Initial mechanical testing was performed with aluminum cylinders to verify results against the finite element model. Glass and carbon fiber composite cylinders were fabricated and tested to failure with the device, and the aforementioned properties were found. Finally, carbon fiber composite tensile specimens of the dog-bone shape were tested to failure to compare material properties with those found from the cylinder tests.
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