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首页> 外文期刊>Scientific reports. >Tensile behaviors of layer-to-layer 2.5D angle-interlock woven composites with/without a center hole at various temperatures
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Tensile behaviors of layer-to-layer 2.5D angle-interlock woven composites with/without a center hole at various temperatures

机译：层到层2.5D角度互锁编织复合材料的拉伸行为，其各种温度下的中心孔

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The temperature-dependent mechanical behaviors of open-hole composite plates are essential for composite design and structures. Here, tensile experiments of shallow straight-link-shaped 2.5D woven composites (abbr. 2.5DWC) with/without a center hole are first conducted at different temperatures (20?°C, 180?°C and 240?°C). Failure modes are examined by scanning electron microscope (SEM). Thermal property of QY8911-IV resin is investigated by DMA analysis. It is noted for samples without the center hole that with the increase of temperature, the tensile stress–strain curves exhibit a linear response until that a slight nonlinearity at the end stage. The strength retention rates at 180?°C and 240?°C are totally equal. For the open-hole samples, it is interestingly found that the strength retention rates are higher than that of samples without the hole at 180?°C, resulting from the stress concentration accommodation and fiber-dominated failure mode. Even at 240?°C, there is no necking phenomenon for all the failed samples, but more broom-like damage extent is observed in the cross-section. Due to the primary load-bearing warp yarns and hole-edge stress concentration, obvious pull-out warp yarns emerge near the hole edge.
机译：开孔复合板的温度依赖性机械行为对于复合设计和结构是必不可少的。这里，具有/没有中心孔的浅直链状2.5D编织复合材料（ABBR.2.5DWC）的拉伸实验首先在不同的温度下进行（20Ω·℃，180℃和240°C）。通过扫描电子显微镜（SEM）检查失效模式。 DMA分析研究了QY8911-IV树脂的热性。对于没有中心孔的样品，在没有温度的增加，拉伸应力 - 应变曲线表现出线性响应，直到末端阶段的轻微非线性。 180°C和240°C的强度保持率完全相等。对于开孔样品，有趣的是发现强度保留速率高于180Ω·°C而没有孔的样品，由应力浓缩容纳和纤维主导的故障模式产生。即使在240°C时，也没有针对所有失败的样品缩颈现象，但在横截面中观察到更多的扫帚损伤程度。由于主要承载翘曲纱线和孔边缘应力集中，孔边缘附近出现明显的拉出经线纱线。

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