Spatial deviations in composite braid unit cell dimensions limit mechanical performance and are challenging to model. Full-field measurements of the irregular tow placement in biaxially braided composite tubes were obtained by digital image correlation. Analysis of the reconstructed tow paths showed long-range defects along the hoop direction with short-range defects dominating the biased tow direction. A route toward numerical simulation of the composite response is established by developing a 3D model of the composite using the measured tow trajectories. Finally, a comparison to previously-published triaxial braid results indicates axial tows work to constrain unit cells dimensions along the hoop direction.

复合编织单元格尺寸的空间偏差限制了机械性能，并且很难建模。通过数字图像相关性获得了双轴编织复合管中不规则丝束放置的全场测量结果。对重建的拖曳路径的分析显示，沿环向存在长距离缺陷，而偏向拖曳方向的短距离缺陷占主导。通过使用测得的拖曳轨迹开发复合材料的3D模型，可以建立通往复合材料响应数值模拟的途径。最后，与先前发布的三轴编织结果的比较表明，轴向拖曳作用是沿环向方向约束单位单元尺寸的。