Tensile fracture characteristics of carbon fibers collected from the outer and inner parts of a CFRP laminate by thermal decomposition
Tensile fracture characteristics of carbon fibers collected from the outer and inner parts of a CFRP laminate by thermal decomposition
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DOI：
10.1016/j.compstruct.2022.115603
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发表时间：
2022-04
影响因子：
6.3
通讯作者：
S. Matsuda;Manami Miyake;Kazumasa Oshima
中科院分区：
文献类型：
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作者：
S. Matsuda;Manami Miyake;Kazumasa Oshima
热分解处理（TDT）是一种典型的碳纤维复合材料回收方法。然而，回收的CF（rCF）由于在该过程中的热氧化而倾向于显示性能降低。特别是，在TDT过程中，CFRP的外部和内部的热氧化速率是不同的;因此，从CFRP的外部（oCF）和内部（iCF）收集的rCF之间的损坏量是不同的。通过单纤维拉伸试验和断口形貌观察，研究了碳纤维增强复合材料层合板在热变形后的oCF和iCF的拉伸断裂特性。iCF的拉伸强度较高，并且呈现出比oCF的拉伸强度更窄的变化，因为iCF的断裂发生在皮肤上形成的最大凹坑处，而oCF的断裂发生在芯部中的最大缺陷处。最后，从TDT处理的CFRP随机收集的rCF的强度分布估计使用的混合物分布模型与实验数据的援助。该模型能很好地拟合强度分布。结果表明，随着经历芯部断裂的rCF数量的增加，rCF的强度变化更大。
Thermal decomposition treatment (TDT) is a typical recycling method for CFRP. However, the recovered CFs (rCFs) tend to show a decrease in performance owing to the thermo-oxidation during this process. In particular, the thermo-oxidation rates of the outer and inner parts of CFRP are different during TDT; thus, the amount of damage is different between the rCFs collected from the outer (oCFs) and inner (iCFs) parts of CFRP. This study investigated the tensile fracture characteristics of the oCFs and iCFs of the CFRP laminates subjected to TDT, through the single-fiber tensile test and fracture surface observations. The tensile strength of the iCFs was higher and presented a narrower variation than that of the oCFs because the fracture of iCFs occurred from the largest pit formed on the skin whereas that of oCFs occurred from the largest defect in the core. Finally, the strength distribution of the rCFs collected randomly from the TDT treated CFRP was estimated using a mixture distribution model with the aid of the experimental data. The model fitted the strength distribution well. The results indicated that the strength of the rCFs varied more widely with an increase in the number of rCFs undergoing the core fracture.