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Numerical evaluation of buckling behaviour induced by compression on patch-repaired composites

机译：修补修补后的复合材料压缩引起的屈曲行为的数值评估

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摘要

A progressive damage model is proposed to predict buckling strengths and failure mechanisms for both symmetric and asymmetric patch repaired carbon-fibre reinforced laminates subjected to compression without lateral restrains. Solid and cohesive elements are employed to discretize composite and-adhesive layers, respectively. Coupling with three dimensional strain failure criteria, an energy-based crack band model is applied to address the softening behaviour in composites with mesh dependency elimination. Both laminar and laminate scaled failure are addressed. Patch debonding is simulated by the cohesive zone model with a trapezoidal traction separation law applied for the ductile adhesive. Geometric imperfection is introduced into the nonlinear analysis by the first-order linear buckling configuration. Regarding strengths and failure patterns, the simulation demonstrates an accurate and consistent prediction compared with experimental observations. Though shearing is the main contributor to damage initiation in adhesive, stress analysis shows that lateral deformation subsequently reverses the distribution of normal stresses which stimulates patch debonding at one of the repair sides. The influence of patch dimensions on strengths and failure mechanisms can be explained by stress distributions in adhesive and lateral deformation of repairs. Comparison between symmetric and asymmetric regarding strength and failure modes shows that structural asymmetry can intensify lateral flexibility. This resulted in earlier patch debonding and negative effects on strengths. (C)2016 Published by Elsevier Ltd.
机译：提出了一种渐进式损伤模型，以预测对称和不对称贴片修复的碳纤维增强层压板在没有侧向约束的情况下受压时的屈曲强度和破坏机理。固体和粘结元件分别用于离散复合层和粘结层。结合三维应变破坏准则，应用基于能量的裂纹带模型解决了消除网格依赖性的复合材料的软化行为。层状和层状氧化皮破坏均得到解决。通过内聚力区域模型模拟贴片脱胶，其中梯形牵引力分离定律适用于韧性粘合剂。通过一阶线性屈曲配置将几何缺陷引入非线性分析。关于强度和破坏模式，与实验观察相比，该模拟显示出准确而一致的预测。尽管剪切是造成胶粘剂损坏的主要因素，但是应力分析表明，横向变形随后会逆转正应力的分布，从而刺激修补面之一处的贴片剥离。补片尺寸对强度和破坏机理的影响可以通过粘合剂中的应力分布和修复的横向变形来解释。比较对称和不对称的强度和破坏模式可知，结构不对称可增强侧向柔韧性。这导致较早的贴片剥离和强度降低。 （C）2016由Elsevier Ltd.发布

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  • 来源
    《Composite Structures》 |2017年第5期|582-596|共15页
  • 作者

    Deng Jian; Zhou Guangming; Bordas Stephane P. A.; Xiang Chao; Cai Dengan;

  • 作者单位

    Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Jiangsu, Peoples R China|Cardiff Sch Engn, Inst Mech & Adv Mat, Cardiff CF24 3AA, S Glam, Wales;

    Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Jiangsu, Peoples R China;

    Duy Tan Univ, Inst Res & Dev, K7-25 Quang Trung, Danang, Vietnam|Univ Luxembourg, Fac Sci Technol & Commun, Res Unit Engn Sci, Campus Kirchberg,6 Rue Richard Coudenhove Kalergi, L-1359 Luxembourg, Luxembourg;

    Nanjing Engn Inst Aircraft Syst Jincheng AVIC, Aviat Key Lab Sci & Technol Aero Electromech Syst, Nanjing 211106, Jiangsu, Peoples R China;

    Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Progressive damage analysis; Buckling compression; Composite laminates; Fracture;

    机译：渐进式损伤分析;屈曲压缩;复合层合板;断裂;

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