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C-Shape Specimen for Tensile Radial Strength of Thick, Filament-wound RingsEngineering Science & Mechanics Department, 212 EES Bldg., The Pennsylvania State University, University Park, PA 16802, USA
Engineering Science & Mechanics Department, 212 EES Bldg., The Pennsylvania State University, University Park, PA 16802, USA; cbakis{at}psu.edu The objective of this investigation is to evaluate a new method of testing thick, C-shaped rings for determining the radial tensile strength of thick, filament-wound composite structures such as flywheel rotors. The proposed method of loading C-rings with a hydraulic jack is simpler than previously used loading methods and is shown to be quite tolerant of eccentricity of the jack. It is shown by sectioning a C-ring that residual stresses in the specimen are negligible. Based on a detailed stress analysis and post-failure inspections of appropriately dimensioned specimens, it is concluded that failure is caused by radial tensile stress at a single critical location in the specimen. The radial tensile strengths of four candidate flywheel rotor materials measured with C-rings were generally less than strengths measured with flexure specimens. The simplicity of specimen preparation and testing by the proposed method, in conjunction with promising early results, suggests that the C-ring test method is suitable for widespread use and possible standardization.
Key Words: C-ring • orthotropic ring • flywheel • radial strength • residual stress
This version was published on January
1, 2006 Journal of Composite Materials, Vol. 40, No. 2,
97-117 (2006) |
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