通过基于深度学习的损伤识别,对二维 C/SiC 复合材料的张力诱导分层进行三维原位观测和内聚区建模

IF 10.5 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Fengwen Kang , Hong Mei , Xiangyun Gao , Daxu Zhang , Fang Ye , Yi Zhang , Laifei Cheng
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引用次数: 0

摘要

二维(2D)碳纤维增强碳化硅基复合材料(C/SiC)的初始缺陷会直接影响其机械性能。层叠关系导致的层间结构差异会导致二维碳纤维/碳化硅复合材料分层和开裂。本研究采用原位扫描电子显微镜和原位计算机断层扫描(CT)拉伸试验来研究层间粘附和载荷传递及其对二维 C/SiC 复合材料拉伸行为的影响。采用基于深度学习的图像分割方法对损伤进行了定量分析,并阐述了分层机理。结果表明,表面涂层上的裂纹呈现周期性开裂,涂层与层压预成型 C/SiC 复合材料之间的界面滑动应力为 1.88 MPa。原位 CT 拉伸试验和深度学习的综合结果表明,二维 C/SiC 复合材料在随机相态下至少存在两种层间结合状态。其中一种具有较多的层间孔隙和较强的粘合力,而另一种则表现出较小的孔隙和较弱的粘合力。在拉伸过程中,由于层间粘合强度不均匀,隧道裂缝发生偏移并形成分层裂缝。分层裂纹不断扩展,直至与主裂纹合并,最终导致材料断裂。最后,根据原位 CT 对二维 C/SiC 复合材料的损伤分析,提出了层间内聚断裂的模拟方法,表明层间结合力弱会引发拉伸分层现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Three-dimensional in-situ observation and cohesive zone modeling of tension-induced delamination of two-dimensional C/SiC composites via deep learning-based damage identification

Three-dimensional in-situ observation and cohesive zone modeling of tension-induced delamination of two-dimensional C/SiC composites via deep learning-based damage identification
The initial defects in two-dimensional (2D) carbon fiber-reinforced silicon carbide matrix (C/SiC) composites directly influence their mechanical properties. Structural discrepancies between the layers resulting from the layer stacking relationship can lead to delamination and cracking in 2D C/SiC composites. In this study, in-situ scanning electron microscopy and in-situ computed tomography (CT) tensile tests were performed to investigate the interlayer adhesion and load transfer and their influence on the tensile behavior of 2D C/SiC composites. Deep learning-based image segmentation approach was used for quantitative analysis of damage, and the delamination mechanism was expounded. The results revealed that the cracks on the surface coating exhibited periodic cracking, and the interfacial sliding stress between the coating and the laminated preform C/SiC composite was 1.88 MPa. Combined results of in-situ CT tensile testing and deep learning, revealed the existence of at least two interlayer bonding states within the 2D C/SiC composite in a random phase state. One of them featured more interlayer pores and stronger adhesion, while the other exhibited smaller pores and weaker adhesion. During the tensile process, the tunnel crack underwent deflection and formed delamination cracks due to uneven interlayer bonding strength. The delamination cracks propagated until they merged with the main crack, eventually leading to the material fracture. Finally, based on the damage analysis of 2D C/SiC composite by in-situ CT, a simulation method for the cohesive fracture between layers was proposed, which indicated that weak interlayer bonding would trigger the tensile delamination phenomenon.
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来源期刊
Carbon
Carbon 工程技术-材料科学:综合
CiteScore
20.80
自引率
7.30%
发文量
0
审稿时长
23 days
期刊介绍: The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.
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