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RELATIONSHIP BETWEEN FIBRE VOLUME RATIO AND CT NUMBER IN FIBRE REINFORCED PLASTICS
RELATIONSHIP BETWEEN FIBRE VOLUME RATIO AND CT NUMBER IN FIBRE REINFORCED PLASTICS
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机译：纤维增强塑料中纤维体积比与CT值之间的关系
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摘要
Abstract of the Invention Fiber volume ratio in a FRP is a very important parameter for ascertaining the strength of the composite laminate specifically in dynamic composite components such as Composite Main Rotor Blade, Tail Rotor Blade, Hub plate etc. It is found that a variation in fiber volume ratio from desired level results in drastic reduction in Inter laminar Shear stress in dynamic condition. It is not realistic and possible to cut and examine components in a batch to find out the resin and fiber volume s eparately. This emphasizes a need for finding out an indirect method like NDT technique to find out fiber volume in a component in general and at a particular place in the component. NDT method like Computed Tomography (CT) gives the accurate as well as exact result which is based on the integrity of the microstructure cross-sectional image / slice internal information to determine the Fiber volume ratio in advanced composite structures in a composite manufacturing inspection. This Computed Tomography works basically by using the X- ray source which is normally using in the Medical purpose. Setting the desired voltage, Current, FOV where the fiber volume ratio within the specimen is monitored through a CT-Examination. Most commercial available Fibre volume ratio techniques are designed to find out after destruction of specimens only where as in CT examination specimens are not disturbed and it will give readymade fiber volume ratio for the components throughout the specimen area. This conventional way of finding out the Fiber volume rat io is basically manual method and it gives error in reading while doing the weighing, burn-off and it consumes lot of time. CT Examination having capable of calculating real time fiber volume ratio at any point throughout the specimen and conventional method will give results at particular point only. A different set of instructions are required to cure each batch of the parts in the autoclave to accomplish better quality. At present Fiber volume ratio measured through CT Number method to standardize the compaction level to accomp lish better quality during process itself. Process variations are monitored and improved then there based on the fiber volume ratio calculation which leads signal the curing parameters that strengthen / serious impact on the part properties, which may lead to the rejection of parts in a batch. This invention relates to an improvement in the field of composites manufacturing advanced composite dynamic products intended for aerospace applications and more particularly in rotary parts composites process. To use CT scan attenuation coefficient in terms of Hounsefield value to measure the fiber volume ratio, experiments have been carried out by manufacturing many glass prepreg panel with different resin contents. This invention highlights CT scan techniques, which can be explored and used to find out the fiber volume ratio by establishing the relationship between fiber volume ratio and Hounsefield value (CT Number) .This invention will help in finding out fiber volume ratio in the composite components that can be used for ana lyzing the strength of the components. These data can be used for optimization of design of composite components in aeronautical ind ustry prompt acknowledgement of results can be done to achieve a reliable process. Also this invention provides a common pla tform for measuring the Fiber volume ratio and monitoring of process variation for quick reference and faster analysis of product quality / process.
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