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原位效应影响下复合材料损伤抗性增强研究

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为研究轻量化碳纤维复合材料抗损伤尤其是抗分层能力增强策略,首先对复合材料原位横向拉伸和剪切强度进行参数化分析,指明材料薄层化后能提升材料的原位强度并改善其抗损伤性能.然后,通过短梁弯曲试验分析得到面外载荷作用下基体裂纹扩展是导致层合板内部分层的重要原因,并构建基于经典Hashin准则和考虑原位效应的材料损伤模型,运用该材料模型对短梁弯曲失效行为开展仿真分析.最后,将该损伤模型和材料强化方案推广应用至局部冲击载荷下层合板损伤分析中.研究结果表明:当正交铺层短梁的单层厚度减少到原来的1/4时,其弯曲强度显著提升48%,结构失效位移也显著变大;层间分层被抑制和结构强度提升的原因在于基体中裂纹萌生和扩展被显著推迟.在相同冲击载荷下,薄层化层合板内部分层区域明显减小,表明薄铺层设计方案提升了碳纤维复合材料层合板局部冲击分层抗性.
Research on enhancement of damage resistance in composite materials under in-situ effects
To study the enhancement strategies for damage resistance,particularly the delamination resistance,of lightweight CFRP composites,a parametric analysis of in-situ transverse tensile and shear strength of composites was conducted,indicating that the enhancement of in-situ strength has a positive impact on mitigating material damage.Subsequently,through short-beam shear experiments,the expansion of in-plane shear-type cracks under external loading was a significant cause of internal delamination in laminates.A material damage model was constructed based on the classical Hashin criterion,taking into account the in-situ effect.This material model was applied to conduct simulation analysis on the bending failure behavior of short beams.Finally,the application of this damage model and material enhancement scheme to the analysis of delamination damage in laminates under local impact loads was extended.The results show that when the single-layer thickness of orthogonally laid short beams is reduced to one-fourth of the original thickness,the bending strength significantly increases by 48%,and structural failure is significantly delayed.The mechanism of inhibiting interlayer delamination and enhancing structural strength lies in the significant delay of crack initiation and propagation in the matrix.The significant difference in delamination area under impact loads suggests that adopting a thin-ply design has tremendous potential to enhance the local impact delamination resistance of CFRP composites.

carbon fiber compositesin-situ strengththin-plydelaminationlocal impact

袁可、徐晨晨、王中钢

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中南大学交通运输工程学院,湖南长沙,410075

轨道交通安全教育部重点实验室,湖南长沙,410075

碳纤维复合材料 原位强度 薄铺层 分层损伤 局部冲击

国家重点研发计划项目湖南省自然科学基金资助项目湖南省科技创新计划项目中国博士后科学基金资助项目

2022YFB43001012023JJ100742023RC10112023M743944

2024

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子:0.938
ISSN:1672-7207
年,卷(期):2024.55(6)
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