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.

开孔复合板的温度相关机械行为对于复合设计和结构至关重要。在这里，首先在不同温度（20°C、180°C 和 240°C）下进行了带/不带中心孔的浅直链形 2.5D 编织复合材料（缩写为 2.5DWC）的拉伸实验。失效模式通过扫描电子显微镜 (SEM) 进行检查。通过DMA分析研究了QY8911-IV树脂的热性能。值得注意的是，对于没有中心孔的样品，随着温度的升高，拉伸应力 - 应变曲线表现出线性响应，直到最后阶段出现轻微的非线性。180 °C 和 240 °C 下的强度保持率完全相等。对于开孔样品，有趣的是，由于应力集中调节和纤维主导的破坏模式，在 180°C 时，强度保持率高于无孔的样品。即使在 240 °C 下，所有失败的样品都没有颈缩现象，但在横截面中观察到更多的扫帚状损坏程度。由于主要承重经纱和孔边应力集中，在孔边附近出现明显的拉出经纱。