Automation of fabric preforming for resin transfer moulded composite parts motivates the need to characterize the response of dry fabric, which is required for the development of simulation models to predict potential draping defects. In this study, the in-plane tensile-shear response of a heavy-tow unidirectional non-crimp fabric (UD-NCF) subjected to bias tensile loading was investigated. Challenges associated with fabric surface texturization and associated strain measurement through digital image correlation was addressed by using a mixture of oil-based paint and mineral spirits to create a suitable speckle pattern. Custom clamps were also designed to prevent the test specimen from damaging or sliding from the grips. Strain maps revealed that the off-axis extension tests induced combined shear, tensile and compressive strains in the fabric test specimens. The fabric deformation response and proposed methods are relevant aspects for characterizing unbalanced UD-NCFs and calibrating corresponding draping simulation models.

用于树脂传递模塑复合材料部件的织物预成型的自动化激发了表征干燥织物响应的需求，这对于开发模拟模型以预测潜在的悬垂缺陷是必需的。在这项研究中，研究了承受偏向拉伸载荷的重牵引单向非卷曲织物（UD-NCF）的面内拉伸剪切响应。通过使用油性涂料和矿物油的混合物来创建合适的斑点图案，可以解决与织物表面纹理化和通过数字图像关联进行的应变测量相关的挑战。还设计了定制夹具，以防止测试样本损坏或从夹具上滑落。应变图显示，离轴延伸测试引起组合剪切，织物测试样品中的拉伸应变和压缩应变。织物变形响应和提出的方法是表征不平衡UD-NCF和校准相应的悬垂仿真模型的相关方面。