Experimental investigation, using 3D digital image correlation, into the effect of component geometry on the wrinkling behaviour and the wrinkling mechanisms of a biaxial NCF during preforming

Experimental investigation, using 3D digital image correlation, into the effect of component geometry on the wrinkling behaviour and the wrinkling mechanisms of a biaxial NCF during preforming
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使用 3D 数字图像相关性进行实验研究,研究部件几何形状对预成型过程中双轴 NCF 起皱行为和起皱机制的影响

DOI:
10.1016/j.compositesa.2020.106248
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发表时间:
2021
期刊:
Applied Science and Manufacturing
影响因子:
--
通讯作者:
Viisainen J
Viisainen J
中科院分区:
--
文献类型:
--
作者:
Viisainen J

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本研究主要探讨非卷曲织物在预成型过程中,构件几何形状对织物卷曲机制的影响。使用3D数字图像相关性,双轴NCF形成超过四个基准的几何形状的扭曲行为的特点和相关的NCF的表面应变。结果表明,几何形状的影响的严重程度上的皱纹是非常显着的,有两种可能的皱纹机制(通过剪切锁定或通过压缩)的大皱纹发生,这是一致的跨几何形状。重要的是,局部剪切阻力的增加(由于在这种情况下的针脚)被证明会导致严重的皱纹,在纺织品加固在低剪切角,由于横向织物压缩。此外,NCF中的丝束扭曲显示与局部丝束压缩相关。因此,认为织物在成形过程中由于过度剪切而起皱并不总是正确的。
This study investigates the effect of component geometry on the wrinkling mechanisms of non-crimp fabrics (NCFs) during preforming. Using 3D digital image correlation, the wrinkling behaviour of a biaxial NCF formed over four benchmark geometries is characterised and related to the NCF’s surface strains. It is shown that the effect of geometry on the severity of wrinkling is highly significant and that there are two possible wrinkling mechanisms (via shear lockup or via compression) for large wrinkles to occur, which are consistent across geometries. Importantly, an increase in local shear resistance (due to the stitches in this case) is shown to cause severe wrinkles in textile reinforcements at low shear angles due to lateral fabric compression. Additionally, tow wrinkling in NCFs is shown to correlate with local tow compression. Thus, it is not always valid to assume that fabrics are only likely to wrinkle during forming due to excessive shearing.
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