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首页> 美国政府科技报告 >Measurement of Full Field Strains in Filament Wound Composite Tubes Under Axial Compressive Loading by the Digital Image Correlation (DIC) Technique.
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Measurement of Full Field Strains in Filament Wound Composite Tubes Under Axial Compressive Loading by the Digital Image Correlation (DIC) Technique.

机译：用数字图像相关（DIC）技术测量轴向压缩载荷下纤维缠绕复合管中的全场应变。

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摘要

The undulated fiber architecture inherent in filament wound polymer matrix composite cylinders presents challenges in predicting fiber direction modulus and strength using traditional micromechanical theories. Therefore, experimental characterization of the micromechanics of fiber micro-buckling in a filament wound composite tube in compression is necessary for using this class of composite in design. A +-theta/89/+-theta tube specimen was devised for the express purpose of evaluating the compressive strength and elastic modulus of the composite material in the fiber direction properties that are believed to be strongly affected by fiber undulations. Composites made with carbon fibers and a flexible polyurethane matrix were evaluated. Three- dimensional digital image correlation was used to measure in plane strains as well as radial displacements. A strong dependence on filament winding pattern (FWP) was found in xx, yy, and xy, as well as dR/dt, the change in the radius with respect to time. The filament wound tubes investigated here required a spatial resolution of approximately 16 pixels/mm in order for the FWP to be resolved in the strain field. If only radial displacements are of interest, a lower resolution may be used.

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