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首页> 外文会议>American Society for Composites technical conference;American Society for Composites >Mode I Interlaminar Fracture Toughness of Natural Fiber Stitched Flax/Epoxy Composite Laminates – Experimental and Numerical Analysis
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Mode I Interlaminar Fracture Toughness of Natural Fiber Stitched Flax/Epoxy Composite Laminates – Experimental and Numerical Analysis

机译：天然纤维缝合亚麻/环氧树脂复合层压板的I型层间断裂韧性-实验和数值分析

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The mode I interlaminar fracture toughness of stitched and unstitched compositelaminates of continuous UD flax fiber and epoxy matrix was experimentally andnumerically investigated. A twistless flax fiber yarn was used for stitching purpose.The mode I interlaminar energy release rate of the unstitched and stitched laminateswas experimentally determined through Double Cantilever Beam (DCB) test. Tensiletest was conducted to characterize the tensile properties of the dry and resinimpregnated forms of the stitch yarn. A 3D Finite Element (FE) model of DCBspecimen to analyze delamination propagation of stitched flax fiber laminate wasdeveloped using cohesive element with nonlinear softening law and embedded 2-nodebeam element. The out-of-plane flax yarn stitching was found to generate a twofoldincrease in the delamination resistance of the composite laminate at a medium stitchdensity. The FE analysis results agreed well with the experimental results, where agood fit between the predicted and experimental R-curves were achieved.
机译：缝合和未缝合复合材料的I型层间断裂韧性 连续UD亚麻纤维和环氧基质的层压板的实验和 进行了数值研究。无捻亚麻纤维纱用于缝合目的。 未缝合和缝合的层压板的模式I层间能量释放率 通过双悬臂梁（DCB）测试通过实验确定。拉力 进行测试以表征干燥和树脂的拉伸性能 针法纱的浸渍形式。 DCB的3D有限元（FE）模型 缝制亚麻纤维层压板的脱层传播的样品为 使用具有非线性软化定律和嵌入式2节点的内聚元素进行开发 梁单元。发现面外亚麻纱线的缝合产生双重影响 中缝时复合层压板的抗分层性增加 密度。有限元分析结果与实验结果非常吻合，其中 在预测的R曲线和实验的R曲线之间实现了良好的拟合。

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