Near-fiber effects of UV irradiation on the fiber-matrix interphase: A combined experimental and numerical investigation
Near-fiber effects of UV irradiation on the fiber-matrix interphase: A combined experimental and numerical investigation
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DOI：
10.1016/j.matdes.2018.07.050
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发表时间：
2018-11-05
影响因子：
8.4
通讯作者：
Singh, Raman P.
中科院分区：
文献类型：
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作者：
Babu, Libin K.;Mishra, Kunal;Singh, Raman P.
由于涉及长度尺度，碳纤维增强聚合物 (CFRP) 中相间区域的表征具有挑战性。使用压痕对测量的载荷-位移曲线的解释受到缺乏解释纤维约束效应的解析解的影响。基于 AFM（原子力显微镜）的压痕和 FE（有限元）模拟的结合显示，沿着纤维的径向线评估的界面弹性模量存在梯度。 3D FEA（有限元分析）表明，在距光纤小于40nm的区域，光纤约束效应显着。尽管如此，与界面弹性模量的梯度相比，由于纤维约束而导致的弹性模量的明显上升是有限的。此外，该技术还用于证明，由于碳纤维的光催化降解，紫外线照射导致纤维附近区域的模量迅速下降，但随后由于高交联而增加。而距离纤维8 mm处的基体模量在紫外线照射24小时后下降了32%。这表明环氧树脂对紫外线照射的响应受到与增强材料的接近程度的影响。 (C) 2018 Elsevier Ltd. 保留所有权利。
Characterization of the interphase region in carbon fiber reinforced polymer (CFRP) is challenging because of the length scale involved. The interpretation of measured load-displacement curves using indentation is affected by the lack of analytical solutions that account for the fiber constraint effect. A combination of AFM (Atomic Force Microscopy) based indentation and FE (Finite Element) simulations showed a gradient in the elastic modulus of the interphase evaluated along a radial line from the fiber. 3D FEA (Finite Element Analysis) indicated that fiber constraint effect is significant in the region less than 40nm away from the fiber. Nonetheless, the apparent rise in elastic modulus due to fiber constraint is limited when compared to the gradient in the elastic modulus of the interphase. Additionally, this technique is used to demonstrate that UV irradiation causes a rapid decrease in the modulus of the region near the fiber due to photocatalytic degradation of carbon fiber but subsequently increases due to high cross-linking. Whereas, the modulus of the matrix at 8 mm away from the fiber decreased by 32% after 24 h of UV irradiation. This indicates that the response of epoxy to UV irradiation is influenced by the proximity to the reinforcement. (C) 2018 Elsevier Ltd. All rights reserved.