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首页> 外文期刊>The Journal of the Textile Institute >Study of changes in 3D-woven multilayer interlock fabric preforms while forming
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Study of changes in 3D-woven multilayer interlock fabric preforms while forming

机译：研究3D编织多层互锁织物预成型件在成型过程中的变化

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摘要

Multilayer woven reinforcements are increasingly employed in the domain of composite materials. Delamination occurrence and resultant failure of a laminated composite piece subjected to high vibrations, is an issue of much concern in aeronautics. The situation becomes more complex in case of bended/curved pieces. In order to improve through the thickness mechanical properties, 3D-woven multilayer interlock fabric is used as composite reinforcement. Structural changes, i.e. thickness change, relative slippage of layers, change in tow aspect ratio and change of orientation of the tows columns, etc. occur in such fabrics during the forming process. These changes may lead to the gradient of the resin amount in composite, internal stresses and variations of mechanical properties in the piece. No significant research has been conducted on this aspect. Lack of knowledge or neglecting these changes may lead to prejudicial estimations of ultimate mechanical properties and fracture analysis. In the present article, the changes that occurred in 5-layer and 13-layer 3D-woven multilayer interlock fabrics have been studied, when moulded at five different angles and two different bending radii. A significant change in thickness, tow aspect ratio, tow orientation and relative layer slippage is observed.
机译：多层编织增强材料越来越多地用于复合材料领域。经受高振动的层压复合件的分层的发生和由此引起的故障是航空领域中非常关注的问题。在弯曲/弯曲的情况下，情况变得更加复杂。为了改善厚度的机械性能，将3D编织多层互锁织物用作复合增强材料。在成形过程中，这种织物发生结构变化，即厚度变化，层的相对滑动，丝束纵横比的变化和丝束柱的取向的变化等。这些变化可能会导致复合材料中树脂量的梯度，内部应力以及工件中机械性能的变化。在这方面尚未进行重大研究。缺乏知识或忽略这些变化可能会导致对最终机械性能和断裂分析的偏见估计。在本文中，已经研究了当以五个不同的角度和两个不同的弯曲半径模制时，在5层和13层3D机织多层互锁织物中发生的变化。观察到厚度，丝束纵横比，丝束取向和相对层滑移有显着变化。

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