The effect of stitch distribution on mode I delamination toughness of stitched laminated composites – experimental results and FEA simulation
The effect of stitch distribution on mode I delamination toughness of stitched laminated composites – experimental results and FEA simulation
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DOI：
10.1016/j.compscitech.2006.06.002
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发表时间：
2007-05
影响因子：
9.1
通讯作者：
Michael D.K. Wood;Xiannian Sun;L. Tong;Anthony Katzos;A. Rispler;Y. Mai
中科院分区：
文献类型：
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作者：
Michael D.K. Wood;Xiannian Sun;L. Tong;Anthony Katzos;A. Rispler;Y. Mai
本文对具有不同缝距分布的Vectran®缝合层合复合材料进行了双悬臂梁试验。编织的碳纤维层片以对称的方式铺叠[0，± 45，90]2，然后在干燥的预成型状态下缝合，随后是树脂膜灌注阶段。为了防止缝合样本在弯曲时失效，将厚的铝加强片与加载块沿着粘合到复合材料样本的两侧。使用INSTRON 5567试验机以0.5mm/min的十字头速度测试试样，在裂纹前缘扩展几毫米后记录裂纹长度、裂纹张开位移和峰值载荷数据。使用顺应性方法的变体对测试数据进行后处理。结果表明，对于相同的缝合密度，但不同的缝合分布缝合试样，存在显着的变化，在临界应变能释放率，GIc。进行了2节点梁和4节点板有限元分析，以模拟TDCB实验，并使用特殊的2节点轴向、仅拉伸、杆单元来离散模拟缝合。FEA结果支持实验结果，将缝合分布确定为确定缝合在桥接模式I分层中提供的改善的关键参数。
In this paper, a tabbed double cantilevered beam test is performed on Vectran®stitched laminated composites with varying stitch distributions. The woven carbon fibre plies were laid-up in a symmetrical manner [0,±45,90]2, then stitched in dry preform state followed by a resin film infusion stage. To prevent the stitched specimens from failing in flexure, thick aluminium reinforcing tabs were adhesively bonded to either side of the composite specimen, along with loading blocks. An INSTRON 5567 testing machine was used to test the specimens at a crosshead speed of 0.5mm/min with crack lengths, crack opening displacements and peak load data being recorded after the crack front had propagated several millimetres. A variation of the compliance method was used to post process the test data. It is revealed that for stitched specimens with identical stitch densities but different stitch distributions, there exists significant variations in critical strain energy release rates, GIc. A 2-node beam and 4-node plate finite element analysis was conducted to model the TDCB experiment with a special 2-node axial, tension only, rod element used to discretely simulate the stitches. The FEA results support the experimental findings identifying stitch distribution as a key parameter in determining the improvement that stitching provides in bridging Mode I delaminations.