Exploring the impact of void content and hygrothermal aging on the performance of carbon/epoxy composite laminates: a comprehensive study

IF 2.4 3区化学 Q3 POLYMER SCIENCE Iranian Polymer Journal Pub Date : 2024-03-20 DOI:10.1007/s13726-024-01295-9

Abd Baghad, Khalil El Mabrouk

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Abstract

The effect of voids and aging on the moisture absorption behavior, diffusion characteristics, and thermomechanical and mechanical performance of autoclaved laminates has been investigated. However, a series of 12 laminates based on HexPly 8552S/AS4 prepregs were manufactured by varying the autoclave process parameters to create laminates with different void contents and subjected to conditioning and aging processes. The moisture absorption behavior was evaluated, and a Fickian diffusion model was employed to describe the moisture absorption process. The results showed that void content influenced the moisture absorption rate, resulting in faster absorption rate. Hygrothermal aging decreased the glass transition temperature (T_g), indicating a loss of rigidity in the laminates. The decrease in T_g varies between 9.08 and 12.57%, with an average decrease of 10.62 ± 1.25% compared to samples not subjected to aging. Aging also affected the laminate’s compressive modulus, with a reduction ranging from 6.99 to 10.65%. In addition, the laminate’s compressive strength decreased from 12.7 to 19.2%, while interlaminar shear strength experienced a reduction from 16.8 to 25.7%. These results indicate that these properties were negatively impacted after the aging process. On the other hand, the presence of voids does not appear to play a significant role in the observed reductions in mechanical and thermomechanical properties. These findings provide valuable insights into the detrimental effects of voids and aging on the properties of carbon/epoxy composite laminates.

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探索空隙含量和湿热老化对碳/环氧复合材料层压板性能的影响：一项综合研究

空隙和老化对高压灭菌层压板的吸湿行为、扩散特性以及热机械和机械性能的影响已被研究过。然而，通过改变高压灭菌工艺参数，制造出不同空隙含量的层压板，并对其进行调节和老化处理，生产出了一系列基于 HexPly 8552S/AS4 预浸料的 12 种层压板。对吸湿行为进行了评估，并采用菲克扩散模型来描述吸湿过程。结果表明，空隙率影响吸湿率，导致吸湿率加快。湿热老化降低了玻璃化转变温度（Tg），表明层压板失去了刚性。与未老化的样品相比，Tg 下降了 9.08% 至 12.57%，平均下降了 10.62 ± 1.25%。老化还影响了层压模量，降低了 6.99% 到 10.65%。此外，层压强度从 12.7% 下降到 19.2%，层间剪切强度从 16.8% 下降到 25.7%。这些结果表明，这些性能在老化过程后受到了负面影响。另一方面，空隙的存在似乎并没有对观察到的机械和热机械性能的降低起到重要作用。这些发现为了解空隙和老化对碳/环氧复合材料层压板性能的不利影响提供了宝贵的见解。

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来源期刊

Iranian Polymer Journal 化学-高分子科学

CiteScore

4.90

自引率

9.70%

发文量

107

审稿时长

2.8 months

期刊介绍： Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.