Retained Hygrothermal State Compression Damage Behavior Investigation of Carbon Fiber Reinforced Composites

IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Applied Composite Materials Pub Date : 2024-04-01 DOI:10.1007/s10443-024-10225-0
Haodong Huo, Jingchao Wei, Yong Cao, Wenzhi Wang, Zhihua Wang
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Abstract

This paper establishes a composite material damage analysis strategy that retains the hygrothermal state to investigate the damage behavior and mechanical performance characteristics of composite materials in hygrothermal environments. Initially, mass diffusion and heat conduction are equivalently considered, and a hygrothermal state predefined model is developed using a combination of sequential and fully coupled approaches. Then the hygrothermal stress field is extracted as the initial state of the compression process, and a compression progressive damage analysis is conducted using the VUMAT subroutine. Additionally, the accelerated hygrothermal aging experiments are conducted to investigate moisture absorption behavior and moisture diffusion coefficients. Then the quasi-static compression tests are carried out on the specimens before and after aging, with failure processes recorded using Digital Image Correlation (DIC). Experimental and simulation results reveal that hygrothermal conditions lead to matrix cracking and debonding from the fiber surface, generating an uneven stress field internally. This results in earlier occurrence and increased severity of delamination during the compression process. The dominant failure modes include wedge splitting and longitudinal cracking. The compressive strength, failure strain, and elastic modulus of the specimens decrease after aging. The analysis strategy developed in this paper effectively reflects the hygrothermal state during compression, aligning more closely with the actual physical processes.

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碳纤维增强复合材料的滞留热态压缩损伤行为研究
本文建立了一种保留湿热状态的复合材料损伤分析策略,以研究复合材料在湿热环境下的损伤行为和机械性能特征。首先,等效考虑质量扩散和热传导,并采用顺序和完全耦合相结合的方法建立湿热状态预定义模型。然后提取湿热应力场作为压缩过程的初始状态,并使用 VUMAT 子程序进行压缩渐进损伤分析。此外,还进行了加速湿热老化实验,以研究吸湿行为和湿气扩散系数。然后对老化前后的试样进行准静态压缩试验,并使用数字图像相关技术(DIC)记录破坏过程。实验和模拟结果表明,湿热条件会导致基体开裂和与纤维表面脱粘,从而在内部产生不均匀的应力场。这导致在压缩过程中更早出现分层现象,并增加了分层的严重程度。主要的破坏模式包括楔形劈裂和纵向开裂。试样的抗压强度、破坏应变和弹性模量在老化后都会降低。本文开发的分析策略有效地反映了压缩过程中的湿热状态,更加贴近实际物理过程。
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来源期刊
Applied Composite Materials
Applied Composite Materials 工程技术-材料科学:复合
CiteScore
4.20
自引率
4.30%
发文量
81
审稿时长
1.6 months
期刊介绍: Applied Composite Materials is an international journal dedicated to the publication of original full-length papers, review articles and short communications of the highest quality that advance the development and application of engineering composite materials. Its articles identify problems that limit the performance and reliability of the composite material and composite part; and propose solutions that lead to innovation in design and the successful exploitation and commercialization of composite materials across the widest spectrum of engineering uses. The main focus is on the quantitative descriptions of material systems and processing routes. Coverage includes management of time-dependent changes in microscopic and macroscopic structure and its exploitation from the material''s conception through to its eventual obsolescence.
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