外突褶皱及其打磨处理对层合板压缩失效行为影响  

Influence of embossed wrinkle and its grinding on the compressive failure behavior of laminates

作　　者：梅星宇 曹子荷 印卓 胡海晓 曹东风 李书欣[1,2,3,4] MEI Xingyu;CAO Zihe;YIN Zhuo;HU Haixiao;CAO Dongfeng;LI Shuxin(Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics,Wuhan University of Technology,Wuhan 430070,China;Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Foshan 528000,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;Institute of Advanced Materials and Manufacturing Technology,Wuhan University of Technology,Wuhan 430070,China;Wuhan Haiwei Marine&Ocean Engineering Technology CO.,LTD.,Wuhan 430070,China)

机构地区：[1]武汉理工大学新材料力学理论与应用湖北省重点实验室,武汉430070 [2]先进能源科学与技术广东省实验室佛山分中心(佛山仙湖实验室),佛山528000 [3]武汉理工大学材料复合新技术国家重点实验室,武汉430070 [4]武汉理工大学先进材料制造装备与技术研究院,武汉430070 [5]武汉海威船舶与海洋工程科技有限公司,武汉430070

出　　处：《复合材料学报》2023年第12期6871-6883,共13页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52273080);中央高校基本科研业务费专项资金(WUT2021IVA068,2021Ⅲ015JC)。

摘　　要：评估打磨处理对含外突褶皱结构承载能力的影响,是开展复合材料制造质量评定与制定装配策略的重要依据。本文采用实验与数值模拟相结合的方法研究了外突褶皱及打磨处理对层合板压缩失效行为的影响。实验方面,借助数字图像DIC技术监测加载过程表面应变分布,采用电子显微相机捕捉损伤过程,分析试样的压缩承载行为和破坏模式。数值模拟方面,采用Hashin失效准则与内聚力方法构建高保真度含褶皱层合板层内/层间失效分析有限元模型,探讨含外突褶皱及打磨褶皱层合板的应力分布特征及失效机制并分析褶皱高度对层合板压缩强度影响。结果表明:外突褶皱降低层合板压缩承载能力,而打磨处理会进一步降低层合板的承载能力与刚度。本文所建立的数值模型与实验结果吻合较好。对于外突褶皱层合板,层合板向褶皱凸起一侧屈曲,褶皱上方发生分层损伤并向端部扩展,纤维损伤从褶皱下侧铺层波谷处向其他层扩展;对于打磨褶皱层合板,主层板向褶皱凸起的相反方向屈曲,首先在打磨断层处发生面外拱起分层损伤,随后褶皱上方纤维层发生拱起断裂,纤维损伤向其他层扩展。随外突褶皱高度的增加,含褶皱层合板及打磨褶皱层合板的压缩失效载荷均显著降低。以上研究可为含外突褶皱复合材料结构的处置方案评估提供参考。Evaluation of the grinding impact on the bearing capacity of laminates with embossed wrinkle is essential for the manufacturing quality assessment and the determination of assembly strategies for composites.In this work,both experimental and numerical investigations were carried out to understand the impact of embossed wrinkle and its grinding treatment on the compressive failure behavior of laminates.In experimental study,digital imaging correlation(DIC)technology was applied to monitor the distribution of surficial strain and industrial digital camera with electron microscope was used to record the damage process.The bearing behavior and fracture mode of the laminates were analyzed.In numerical study,high-fidelity finite element models were created to predict the intra/inter-laminar failure by combining the Hashin failure criterion and cohesive element method.The features of stress distribution and failure mechanism of the laminates with embossed wrinkle and the one grinded were investigated,the influence of wrinkle height on compressive strength were also explored.The results show that the embossed wrinkle plays a significantly negative impact on the compressive loading capacity of laminates,and the loading capacity would be decreased further by the grinding operation,as well as the stiffness.The numerical prediction fits well with the test data.For the embossed wrinkle samples,the laminate buckles along the convex direction of wrinkled layers.Delamination occurs above the wrinkled area and extends to the loading ends.The fiber breakage extends from the trough of wave layer under the wrinkled area to the other layers.For the grinded samples,the laminate buckles opposite the wrinkle convex direction.First,the discontinuous layer arches and delamination occurs.Afterwards,the upside continuous layer at wrinkle area arches and breaks,the fiber damage spreads around.With the increase of wrinkle height,the compressive failure loads of wrinkled laminates and the grinding samples both significantly decrease.This work

关 键 词：复合材料层合板 褶皱缺陷 压缩强度 数值分析 打磨处理 

分 类 号：TB330.1[一般工业技术—材料科学与工程]