【摘要】 随着碳纤维增强聚合物(carbon fiber reinforced polymers, CFRPs)在高温度环境中应用日益广泛，研究其对材料性能的影响变得至关重要。该研究对准各向同性平纹和单向碳纤维增强层压板的弯曲强度进行了热氧化老化影响的研究与对比，即对试样进行了不同时间的热氧化老化处理，并通过三点弯曲试验对其弯曲强度进行了评估。结果证明层压板的弯曲强度随老化时间的延长而降低。值得注意的是，尽管平纹复合层压板的纤维含量较低，但其弯曲强度却高于单向复合层压板。经过8 d的老化，平纹板的弯曲强度仅下降了4%～5%,而单向板则下降了11%～14%。经过32 d的老化后，弯曲强度最高(595.52 MPa)的是最低纤维含量的较薄平纹复合层压板，其次是薄单向复合层压板(549.83 MPa),然后是厚平纹复合层压板(445.29 MPa),最低的是厚单向复合层压板(393.90 MPa)。层压板弯曲性能的下降主要归因于基体氧化引起的基体裂纹和界面脱粘。为了验证结果的普遍性，该研究采用了有限元方法进行模拟，结果与试验数据相符。更多还原

【Abstract】 With an increased utilization of carbon fiber reinforced polymers(CFRPs) in high temperature environments, investigating their effects on materials becomes exceedingly important. This study presents a comparative investigation of thermo-oxidative aging effects on the flexural performance of two carbon fiber reinforced composite laminates(CFRCLs): a quasi-isotropic plain-woven CFRCL and a quasi-isotropic unidirectional layup CFRCL(designated as PW-CFRCL and UD-CFRCL, respectively). The CFRCLs were subjected to thermo-oxidative aging for specific durations, and their flexural strength was evaluated through three-point bending tests. The flexural strength of the laminates decreased with the prolonged aging duration. Despite having lower fiber content, PW-CFRCLs showed higher flexural strength than UD-CFRCLs. After eight days of aging, the flexural strength of PW-CFRCLs decreased by merely 4%-5%, while that of UD-CFRCLs decreased by 11%-14%. After 32 days of aging, the thinner PW-CFRCL with the lowest fiber content exhibited the highest flexural strength(595.52 MPa), followed by the thinner UD-CFRCL(549.83 MPa), then the thicker PW-CFRCL(445.29 MPa) and finally, the thicker UD-CFRCL(393.90 MPa). The decline in flexural properties of the laminates was primarily attributed to matrix cracking and interface debonding resulting from matrix oxidation. To validate the universality of this result, the finite element method was employed, showing a good correlation with the experimental findings.更多还原