This paper concerns shear testing of a quasi-unidirectional non-crimp fabric used for wind turbine blades. In this context “quasi” refers to the fact that the majority of the reinforcement is oriented along the longitudinal direction with a small amount acting as a stabilizing backing layer in the ± 80^∘ direction. The bias-extension test is used to investigate the in-plane shear kinematics of the fabric, i.e. whether a pure or simple shear kinematic is more suitable. Further, an expected outcome of the test is a maximum applicable shear angle. Such information is highly important when simulating the draping of the fabrics in a blade mold. The investigation shows that the fabric deforms mostly in pure shear for the shear angles relevant for wind turbine blade production.

本文涉及用于风力涡轮机叶片的准单向非卷曲织物的剪切测试。在本文中，“准”是指大部分增强材料沿纵向定向，少量用作± 80 ^∘方向上的稳定背衬层。偏置延伸试验用于研究织物的平面内剪切运动学，即纯剪切运动学还是简单剪切运动学更合适。此外，测试的预期结果是最大适用剪切角。在模拟叶片模具中的织物悬垂时，此类信息非常重要。调查表明，对于与风力涡轮机叶片生产相关的剪切角，织物主要在纯剪切中变形。