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The fatigue behaviour and damage development of 3D woven sandwich composites

机译：3D编织夹芯复合材料的疲劳行为和损伤发展

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摘要

In this paper, the bending fatigue behaviour and damage development during fatigue of polyurethane (PUR)--epoxy 3D woven sandwich composites is investigated. 3D sandwich fabrics are produced by a velvet weaving technique. It allows relatively easy production of delamination-resistant sandwich panels, compared to more traditional sandwich structures with honeycomb or foam cores. In this paper, the 3D sandwich fabrics made of glass fibre are impregnated with epoxy resin while the empty core can be foamed up with PUR to improve shear resistance of the panels. Core properties and static bending strength of the panels were evaluated. Three-point bending (3PB) fatigue tests were performed on four different materials (two unfoamed epoxy panels and two PUR foamed epoxy panels) with varying static properties. After fatigue testing, the Wohler curves for each panel were determined. The relation between the observed damage development, the property degradation during bending fatigue and the static properties of the panels was investigated.
机译：本文研究了聚氨酯（PUR）-环氧3D编织夹芯复合材料的弯曲疲劳行为和疲劳发展过程中的损伤发展。 3D三明治面料是通过天鹅绒编织技术生产的。与具有蜂窝或泡沫芯的更传统的三明治结构相比，它可以相对容易地生产抗分层的三明治板。在本文中，玻璃纤维制成的3D三明治织物用环氧树脂浸渍，而空芯可以用PUR发泡以提高面板的抗剪切性。评价了板的芯性能和静态弯曲强度。在具有不同静态特性的四种不同材料（两个未发泡的环氧板和两个PUR发泡的环氧板）上进行了三点弯曲（3PB）疲劳测试。经过疲劳测试后，确定每个面板的Wohler曲线。研究了观察到的损伤发展，弯曲疲劳过程中的性能下降与面板的静态性能之间的关系。

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