This paper focuses on an experimental study of the thermal cycling behavior of a carbon fiber/epoxy matrix composite material reinforced with a non-crimp 3D orthogonal woven preform (3DNCOW). The aim is to characterize the damage mechanisms – i.e. matrix cracking – induced by thermal cycling thanks to X-ray micro-computed-tomography (µCT). Qualitative and quantitative descriptions of the morphology and the evolution of cracks with thermal cycling are carried out through the analysis of µCT scans of samples at different cycle numbers. In addition, since the specimens have a certain level of porosity due to the infusion process, a complete description of this defect is carried out, and its influence on the damage mechanisms induced by thermal cycling is analyzed.

本文着重于非卷曲3D正交编织预成型坯（3DNCOW）增强的碳纤维/环氧树脂基复合材料的热循环行为的实验研究。目的是表征由于X射线微计算机断层扫描（µCT）而由热循环引起的破坏机理，即基体开裂。通过分析不同循环次数下的样品的μCT扫描，可以对热循环的形态和裂纹演化进行定性和定量描述。另外，由于试样由于注入过程而具有一定程度的孔隙率，因此对该缺陷进行了完整的描述，并分析了其对热循环引起的损伤机理的影响。