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Partial volume correction for approximating crack opening displacements in CFRP material obtained from micro-focus X-ray CT scans

机译:用于近似从微焦点X射线CT扫描获得的CFRp材料中的裂缝开口位移的部分体积校正

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摘要

This paper presents a partial volume correction technique that applies a measurement weighting based on grey scale intensity values, allowing crack opening displacements (CODs) to be better estimated in micro-focus computed tomography (?CT) scans. These were tested on 3D data obtained from two separate ?CT scanners on particle toughened and non-particle toughened carbon fibre material subjected to low velocity impact. Direct comparisons of COD estimations were made with higher resolution measurements obtained using synchrotron radiation computed tomography (SRCT) scans taken at the European Synchrotron Radiation Facility (ESRF). In this study, partial volume correction is reported to improve the accuracy of these measurements to within 20% of SRCT measurements, whereas measurements based on counting interconnected voxels representing a detectable crack are reported to consistently overestimate crack openings by up to 500%. Scatter in estimations was dependent on material type, noise, and artefacts associated with ?CT volumes.
机译:本文提出了一种部分体积校正技术,该技术基于灰度强度值应用测量权重,从而可以在微焦点计算机断层扫描(?CT)扫描中更好地估计裂缝开口位移(COD)。在从两个单独的?CT扫描仪获得的3D数据上对这些材料进行了测试,这些数据是在受到低速冲击的颗粒增韧和非颗粒增韧的碳纤维材料上制成的。使用欧洲同步辐射辐射设施(ESRF)进行的同步辐射计算机断层扫描(SRCT)扫描获得的高分辨率测量结果可以直接比较COD估算值。在这项研究中,据报道部分体积校正可将这些测量的准确性提高到SRCT测量的20%以内,而据报道,基于对表示可检测裂纹的互连体素进行计数而得出的测量结果始终高估了裂纹开口达500%。估计中的散布取决于材料类型,噪声以及与?CT体积相关的伪影。

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