Failure Mechanisms and Defect Analysis of 3D Printed CCF/PEEK Composites Based on Synchrotron Radiation
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摘要: 针对丝材预浸渍处理的连续碳纤维增强聚醚醚酮复合材料(CCF/PEEK),采用同步辐射μCT表征手段,分析了拉伸/弯曲过程中碳纤维/树脂界面和层间的失效模式及机制,结合缺陷和拉伸力学性能分析,揭示了预浸渍处理对CCF/PEEK材料结构和力学性能的影响。研究结果表明:由于不良浸渍及层间温度梯度,预浸渍样品在纤维/树脂界面和层间均存在缺陷,并随拉伸/弯曲载荷作用演变为层间裂纹,原丝样品则发生纤维脱粘和拔出;预浸渍处理后试样平均拉伸强度提高17.21%,孔隙率降低56.6%,树脂充分渗入纤维丝束,明显改善了材料纤维/树脂界面结合和力学性能。
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关键词:
- 连续碳纤维增强聚醚醚酮 /
- 同步辐射μCT /
- 失效模式 /
- 预浸渍 /
- 拉伸强度
Abstract: In this study, continuous carbon fiber-reinforced poly-ether-ether-ketone composite (CCF/PEEK) with filament pre-impregnation(prepreg) treatment was investigated. Employing synchrotron radiation μCT characterization, the failure modes and mechanisms at the fiber/resin interface and interlayers during tensile/bending processes were analyzed. Combined with defect and tensile mechanical property analyses, the impact of prepreg on the structure and mechanical properties of CCF/PEEK materials was elucidated. The results revealed that due to inadequate impregnation and interlayer temperature gradients, defects existed at both the fiber/resin interface and interlayers in the prepreg sample, evolving into interlaminar cracks under tensile/bending loads, while fiber debonding and pull-out occurred in the original sample. After prepreg treatment, the average tensile strength of the samples increased by 17.21%, and the porosity decreased by 56.6%. The resin fully infiltrated the fiber bundles, significantly enhancing the fiber/resin interface bonding and mechanical properties of the material. -
表 1 碳纤维相关参数
Table 1. Properties of carbon fiber
Properties Typical value Density 1.76 g/cm³ Tensile strength 3880 MPa Tensile modulus 234 GPa 表 2 聚醚醚酮(PEEK)相关参数
Table 2. Properties of poly-ether-ether-ketone composite (PEEK)
Properties Typical value Density 1.30 g/cm³ Glass transition temperature 143℃ Melting Point 343℃ Tensile strength 99.9 MPa Young’s modulus 3738 MPa 表 3 预浸丝试样拉伸缺陷变化
Table 3. Porosity changes of prepreg sample during stretching process
Stretched state Tensile force Defect volume fraction 1 80 N 4.34% 2 240 N 10.60% 3 140 N 10.41% 4 100 N 14.80% 表 4 两类试样缺陷特征
Table 4. Defect characteristics of two types of samples
Void characteristics Raw sample Prepreg sample Volume/μm³ 109720.15±
1949990.0642468.19±
301969.30Surface area/μm2 (274.63,
60440843.13)(274.63,
9079102.5)Shape factor *1647.75 *1922.375 Defect volume fraction 4.61% 2.00% Note: Pore data larger than 200 voxels are expressed as: mean ± standard deviation (minimum, maximum) * median. 表 5 CCF/PEEK标准试样拉伸力学性能
Table 5. Tensile mechanical properties of CCF/PEEK standard specimens
Type σM/MPa Et/MPa εB/% Raw samples 270.054 31789.142 0.894 Prepreg samples 316.536 29465.054 0.990 Note: Physical significance of each parameter—σM represents tensile strength, Et represents tensile modulus of elasticity and εB represents tensile fracture strain. -
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