热氧化老化对碳纤维/环氧树脂三维编织复合材料渐进弯曲损伤和机电行为的影响

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS

ACS Applied Bio Materials Pub Date : 2024-04-23 DOI:10.1177/00219983241249238

Gen Li, Tianwei Wu, B. Sun, B. Gu

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引用次数: 0

摘要

热氧化老化对力学性能的影响对于设计在长期大气环境中使用的碳纤维增强复合材料非常重要。在此，我们报告了碳纤维/环氧树脂三维角交织复合材料（3DAWC）在热氧化老化后的渐进弯曲损伤行为。我们进行了三点弯曲试验，以表征不同老化天数后的弯曲损伤行为。在三点弯曲试验过程中，还采用双探针法同时测量了 3DAWC 的电阻变化。结合侧面图像和数字图像相关（DIC）技术，我们发现在热氧化老化过程中，弯曲强度和模量迅速恶化。应变分布和渐进弯曲损伤模式也发生了显著变化，即未老化试样的应变分布是对称的，而老化试样现有的界面裂纹改变了这种对称性。电阻法（ERM）有效地识别了早期损伤，电阻变化率的一阶导数（FDC）揭示了老化试样和未老化试样在渐进损伤模式上的差异。

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Effects of thermo-oxidative aging on progressive bending damages and electromechanical behaviors of carbon fiber/epoxy 3D woven composites

The effect of thermo-oxidative aging on mechanical properties is important to designing carbon fiber-reinforced composites serviced in long-term atmospheric environments. Here, we report the progressive bending damage behaviors of carbon fiber/epoxy 3D angle-interlock woven composites (3DAWCs) after thermo-oxidative aging. Three-point bending tests were conducted to characterize bending damage behaviors after different aging days. The electrical resistance change of 3DAWCs was also simultaneously measured with the two-probe method during three-point bending tests. Combining side image and digital image correlation (DIC) technology, we found that the bending strength and modulus deteriorated rapidly during thermo-oxidative aging. The strain distribution and progressive bending damage modes also changed significantly, i.e., a symmetrical strain distribution for the unaged specimens, while the existing interface cracks of the aged specimen changed this symmetry. The electrical resistance method (ERM) effectively identified the early-stage damages, and the first derivative of the rate of resistance change (FDC) revealed differences in the progressive damage modes of aged and unaged specimens.

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.