THE INFLUENCE OF MANUFACTURING DEFECTS ON STRUCTURAL PERFORMANCE OF COMPOSITE OVERWRAPPED PRESSURE VESSELS

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Kıvanç Yurdakul Thesis_107page.pdf

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2022-2-04

Author

Yurdakul, Kıvanç

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In this study, the influence of defects that are occurred in manufacturing operations of filament wound composite overwrapped pressure vessels on burst pressure is investigated experimentally. Firstly, material characterization methods such as tensile testing and fiber volume fraction testing of carbon/epoxy composite specimens are completed. Following determining of different layer configurations for small scale composite pressure vessels, manufacturing and burst testing of vessels are accomplished. Effect of composite layer configuration hence stress ratio on burst pressure and failure mode is observed. Then, two types of manufacturing defects are defined as delamination and spaced winding for two different layer configurations. Artificial delaminations are embedded to the samples during manufacturing and cured samples are subjected to hydrostatic burst testing. Likewise, gaps were deliberately left the in layers and the effects of these gaps on burst pressure and fracture mode were observed. Fracture behavior of burst vessels are investigated via high-speed camera images taken during testing. Finally, composite microstructure via optical microscope and fracture surfaces via scanning electron microscope (SEM) are examined. Experimental and visual data obtained by this study is investigated and influence of manufacturing defects in composite overwrapped pressure vessels on burst pressure performance of vessels is evaluated within the design limits of small scale vessel.

Subject Keywords

Composite Overwrapped Pressure Vessels, Filament Winding, Stress Ratio, Burst Pressure, Manufacturing Defects

URI

https://hdl.handle.net/11511/96273

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

K. Yurdakul, “THE INFLUENCE OF MANUFACTURING DEFECTS ON STRUCTURAL PERFORMANCE OF COMPOSITE OVERWRAPPED PRESSURE VESSELS,” M.S. - Master of Science, Middle East Technical University, 2022.