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Numerical modelling of through-thickness reinforced structural joints

机译:增厚结构节点的数值模拟

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摘要

The main objective of this research study was to develop numerical modelsto analyse the mechanical and fracture properties of through-thickness reinforced(TTR) structural joints. The development of numerical tools was mainlybased on the finite element (FE) method. A multi-scale approach was used:the bridging characteristics of a single reinforcement was studied at micromechanicallevel by simulating the single-pin response loaded either in mode-Ior in mode-II. The force-displacement curve (bridging law) of the pin was usedto define the constitutive law of cohesive elements to be used in a FE analysisof the global structure.This thesis is divided into three main parts: (I) Background, context andmethodology, (II) Development for composite joints, and (III) Developmentfor hybrid metal-composite joints. In the first part the objectives of the thesisare identified and a comprehensive literature review of state-of-art throughthicknessreinforcement methods and relative modelling techniques has beenundertaken to provide a solid background to the reader.The second part of the thesis deals with TTR composite/composite joints. Themulti-scale modelling technique was firstly applied to predict delamination behaviourof mode-I and in mode-II test coupons. The bridging mechanismsof reinforcements and the way these increase the delamination resistance ofbonded interfaces was deeply analysed, showing how the bridging characteristicsof the reinforcement features affected the delamination behaviour. Themodelling technique was then applied to a z-pin reinforced composite T-jointstructure. The joint presented a complicated failure mode which involved multiplecrack path and mixed-mode delamination, demonstrating the capabilityof the model of predicting delamination propagation under complex loadingstates.The third part of the thesis is focused on hybrid metal/composite joints. Mode-I and mode-II single-pin tests of metal pin reinforcements embedded into acarbon/epoxy laminate were simulated. The model was validated by comparingwith experimental tests. Then the effects of the pin geometry on thepin bridging characteristics were analysed. The model revealed that both inmode-I and mode-II small pins perform better than large pins and also thatthe pin shape plays an important role in the pin failure behaviour. The modellingtechnique was then applied to simulate a metal-composite double-lapjoint loaded in traction. The model showed that to obtain the best performanceof the joint an accurate selection of pin geometry, pin arrangement andthickness of the two adherends should be done.
机译:这项研究的主要目的是建立数值模型,以分析全厚度增强(TTR)结构接头的力学性能和断裂性能。数值工具的开发主要基于有限元方法。使用了多尺度方法:通过模拟加载在模式I或模式II中的单销响应,在微机械水平上研究了单个钢筋的桥接特性。销钉的力-位移曲线(桥接定律)用于定义用于整体结构有限元分析的内聚元素的本构定律。本论文分为三个主要部分:(I)背景,背景和方法,( II)开发复合关节,以及(III)开发混合金属复合材料关节。第一部分确定了论文的目标,并进行了有关最新厚度增强方法和相关建模技术的综合文献综述,以为读者提供扎实的背景。第二部分涉及TTR复合材料/复合材料关节。首次将多尺度建模技术用于预测I型和II型测试样片的分层行为。深入分析了增强材料的桥接机理以及这些方法如何增加粘结界面的抗脱层性,表明了增强部件的桥接特性如何影响脱层性能。然后将建模技术应用于z钉增强的复合T型接头结构。接头呈现出复杂的破坏模式,涉及多裂纹路径和混合模式分层,证明了在复杂载荷状态下预测分层传播模型的能力。论文的第三部分着重于金属/复合材料混合节点。模拟了嵌入到碳/环氧树脂层压板中的金属销增强材料的I型和II型单销测试。通过与实验测试的比较验证了该模型。然后分析了销钉几何形状对销钉桥接特性的影响。该模型表明,I型和II型小插针的性能均优于大插针,并且插针形状在插针失效行为中也起着重要作用。然后将建模技术应用于模拟牵引力作用下的金属复合双搭接缝。该模型表明,要获得最佳的接头性能,应正确选择两个被粘物的销钉几何形状,销钉排列和厚度。

著录项

  • 作者

    Bianchi Francesco;

  • 作者单位
  • 年度 2012
  • 总页数
  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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