The size effects in centre-notched quasi-isotropic carbon/epoxy laminates under compression were investigated. The in-plane dimensions of the baseline specimen were scaled up by a factor of up to 14. The centre-notched specimens were compared to open-hole specimens of the same dimensions. It was found that compressive strength of the small centre-notched specimen is similar to that of the open-hole specimen. However, as the in-plane dimensions increase, the centre notches are weaker than the open holes, and start to follow a Linear Elastic Fracture Mechanics (LEFM) scaling line. These trends were well captured by a Composite Compressive Strength Modeller (CCSM) using the fracture toughness measured in the current study. Fibre micro-buckling was confirmed to be the dominant failure mechanism under compression. The failure mechanisms under compression were also compared against those under tension. Matrix splitting under compression was observed through X-ray Computed Tomography but was less extensive than under tensile loading.

研究了中心缺口准各向同性碳/环氧树脂层压板在压缩下的尺寸效应。将基线样品的平面尺寸放大最大14倍。将带有中心切口的样品与相同尺寸的裸眼样品进行比较。结果发现，小中心缺口试样的抗压强度与裸眼试样的抗压强度相似。但是，随着平面尺寸的增加，中心槽口比裸眼孔要弱，并且开始遵循线性弹性断裂力学（LEFM）缩放比例线。使用当前研究中测得的断裂韧性，复合抗压强度建模器（CCSM）可以很好地捕获这些趋势。纤维微屈曲被证实是压缩下的主要失效机理。还比较了受压下的破坏机理和受拉下的破坏机理。通过X射线计算机断层扫描观察到了压缩下的基体分裂，但没有拉伸载荷下的基体分裂。