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Near-fiber effects of UV irradiation on the fiber-matrix interphase: A combined experimental and numerical investigation

机译：紫外线对纤维-基体间相的近纤维效应：结合实验和数值研究

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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.
机译：碳纤维增强聚合物（CFRP）的相间区域的表征具有挑战性，因为其涉及的长度尺度。使用压痕对测得的载荷-位移曲线的解释受缺乏解决纤维约束效应的分析解决方案的影响。基于AFM（原子力显微镜）的压痕和FE（有限元）模拟的组合显示出沿纤维的径向线评估的相间弹性模量的梯度。 3D FEA（有限元分析）表明，在距离光纤不到40nm的区域中，光纤约束效果显着。但是，与中间相的弹性模量的梯度相比，由于纤维限制而引起的弹性模量的表观上升受到限制。另外，该技术用于证明紫外线辐射由于碳纤维的光催化降解而导致纤维附近区域的模量快速下降，但随后由于高交联而增加。而距纤维8 mm处的基质模量在紫外线照射24 h后下降了32％。这表明环氧树脂对紫外线辐射的响应受与增强材料的接近程度的影响。 （C）2018 Elsevier Ltd.保留所有权利。

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