Formability evaluation of carbon fiber NCF by a non-contact 3D strain measurement system and the effects of blank folder force on its formability

机译：非接触式3D应变测量系统的碳纤维NCF的可平性评价及空白夹力对其成形性的影响

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Non-Crimp Fabric (NCF) consists of unidirectional plies, which are kept together by stitching yarns arranged in a number of different orientations relative to the fabric production direction. Since NCF has no crimp, NCF can take full advantage of the continuous carbon fibers. As NCF is deformed mainly due to shear deformation, it is difficult to form 3D shapes from it. Therefore, formability improvement of NCF by slitting a textile preform has been attempted; however, problems such as strength degradation at a notch and cost increase due to the increase of working process have occurred. So, it is necessary to improve formability of NCF without slitting. One of the methods of formability improvement is to use blank holder force. In previous studies, though the influence of blank holder force on formability of woven fabrics has been clarified, that on formability of NCF is uncertain. In this study, the hemisphere geometry punch drape test was conducted to evaluate the influence of blank holder force on the formability of NCF. Meanwhile, deformation of NCF during the drape test was measured by a non-contact 3D strain measurement system.

机译：非卷曲织物（NCF）由单向帘布层组成，通过缝合相对于织物生产方向以多种不同取向的缝合纱线保持在一起。由于NCF没有压接，因此NCF可以充分利用连续碳纤维。由于NCF主要是由于剪切变形而变形，因此难以从中形成3D形状。因此，已经尝试了通过切割纺织品预制件的NCF的可成型性改进;然而，发生了诸如强度降解的问题，并且由于工作过程的增加而导致的成本增加。因此，有必要提高NCF的可成形性而不裂缝。可成形性改进的方法之一是使用空白保持器力。在以前的研究中，虽然阐明了空白夹持器力对织物可成形性的影响，但在NCF的可成形性上是不确定的。在这项研究中，进行了半球几何冲头悬垂试验以评估坯料保持器力对NCF成形性的影响。同时，通过非接触式3D应变测量系统测量悬垂试验期间NCF的变形。

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《International conference on high performance and optimum design of structures and materials》|2014年|677 p.|共10页
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K. Tanaka; R. Ushiyama; T. Katayama; S. Enoki; H. Sakamoto;
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carbon fibers; non-crimp fabric (NCF); blank holder force; non-contact 3D strain measurement system; drape test;

机译：碳纤维;非卷曲织物（NCF）;坯料支架力;非接触式3D应变测量系统;悬垂性测试;

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Formability evaluation of carbon fiber NCF by a non-contact 3D strain measurement system and the effects of blank folder force on its formability

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