Composite laminates often comprise notch-like features such as drilled assembly holes or geometric discontinuities resulting from damage. These features induce stress concentrations in their vicinities and can, through incompletely understood temperature-dependent damage mechanisms, reduce laminates’ load carrying capacity. Accordingly, this work investigates the effect of elevated temperatures on the notch sensitivity of carbon fiber-reinforced polymer composites and on the initiation and progression of notch-triggered damage mechanisms. This work employs an experimental approach in which tensile notched and un-notched specimens are loaded in controlled temperatures. Specimens are tested at multiple temperatures, and their nominal and local behavior in the vicinity of a circular notch are observed using digital image correlation. Results demonstrated a decreasing trend in the elastic moduli and ultimate tensile strength of notched specimens with increasing temperatures. However, the global response of notched samples at 50 \(^{\circ }\)C surprisingly deviated from the expected trend and exhibited 8% higher tensile strength than that observed at 25 \(^{\circ }\)C. Moreover, the notch sensitivity was found to decrease with increasing temperatures. Two main temperature-sensitive notch-triggered damage mechanisms were observed, namely transverse cracks and axial splitting. Transverse cracks were evident at all considered temperatures, while axial splitting was absent at room temperature.

复合材料层压板通常包含类似缺口的特征，例如钻出的装配孔或由于损坏而导致的几何不连续性。这些特征会在其周围引起应力集中，并且可能通过不完全了解温度相关的损坏机制而降低层压板的承载能力。因此，这项工作研究了高温对碳纤维增强的聚合物复合材料的缺口敏感性以及缺口引发的损伤机理的引发和发展的影响。这项工作采用了一种实验方法，其中在控制温度下加载拉伸缺口和未缺口试样。在多个温度下对样品进行测试，并使用数字图像相关性在圆形缺口附近观察其标称和局部行为。结果表明，随着温度的升高，缺口试样的弹性模量和极限拉伸强度呈下降趋势。但是，有缺口的样本的整体响应为50 \（^ {\ circ} \） C出乎意料地偏离了预期趋势，并且比在25 \（^ {\ circ} \） C时观察到的抗张强度高出8％  。此外，发现缺口敏感性随着增加而降低温度。观察到两种主要的温度敏感型缺口触发损伤机制，即横向裂纹和轴向分裂。在所有考虑的温度下均会出现横向裂纹，而在室温下则不会出现轴向开裂。