Residual Stressesin intrinsic hybrid laminates, detection, modification and consideration in manufacturing and the numeric damage modeling

本质混合层压板中的残余应力、制造中的检测、修改和考虑以及数值损伤建模

基本信息

项目摘要

The different thermal properties of the components as well as the anisotropy of hybrid CFRP-metal-composites lead to intrinsic high residual stresses during the production processes reducing in turn the strength of the hybrid composite. The project aims to investigate measures to reduce the interlaminar stresses. Therefore, measurement technologies are investigated for measuring the existing or nascent residual stresses. The focus lies on the application of fiber optical sensors being directly integrated into the uncured fibre reinforced polymer. Measures for modifying the level of residual stresses are investigated subsequently. Parametric mass screenings reveal the cause-effect relationships between the material parameters and the process parameters as well as the interlaminar residual stresses.Beside the intrinsic stresses asymmetric layups lead to process-induced deformations like curvatures or deflections. Curved structures exhibit significant complex stress states.The developed measurement principle will be adapted such that beside the determination of the residual stresses statements about the sources of process-induced deformation can be made. The achieved perceptions from the first funding period about the origin of residual stresses, the influence of different intrinsic and extrinsic factors are used to discover the cause-effect relationships between the process-induced deformation evoked by the structural curvature, the asymmetry, and the embedded residual stresses. Beside measures for reducing these stresses compensating methods for producing dimensionally accurate structures are investigated for hybrid structures. The developed compensating methods are used to manufacture accurate flat asymmetric coupons for CAI investigations. The effect on the damage behavior will be investigated experimentally.
部件的不同热性能以及混杂CFRP-金属-复合材料的各向异性导致在生产过程期间固有的高残余应力,从而降低混杂复合材料的强度。该项目旨在研究降低层间应力的措施。因此,测量技术的研究,用于测量现有的或新生的残余应力。重点在于将光纤传感器直接集成到未固化的纤维增强聚合物中的应用。随后研究了修改残余应力水平的措施。参数质量筛选揭示了材料参数和工艺参数以及层间残余应力之间的因果关系,除了内应力外,非对称铺层还会导致弯曲或挠度等工艺诱导变形。弯曲结构表现出显着复杂的应力状态。开发的测量原理将被调整,以便除了确定残余应力之外,还可以对工艺引起的变形来源进行说明。从第一个融资期的残余应力的起源,不同的内在和外在因素的影响所取得的看法被用来发现的过程引起的变形引起的结构曲率,不对称性,和嵌入的残余应力之间的因果关系。此外,还研究了混合结构的应力补偿方法。开发的补偿方法用于制造精确的平面非对称试样的CAI调查。对损伤行为的影响将进行实验研究。

项目成果

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Professor Dr.-Ing. Michael Sinapius其他文献

Professor Dr.-Ing. Michael Sinapius的其他文献

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{{ truncateString('Professor Dr.-Ing. Michael Sinapius', 18)}}的其他基金

Combination of Automated Fibre Placement (AFP) and Additive Layer Manufacturing (ALM)
自动纤维铺放 (AFP) 与增材层制造 (ALM) 的结合
  • 批准号:
    393105855
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Hybrid Consolidation
混合整合
  • 批准号:
    314731577
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Controlled Pultrusion Process including in-situ quality-control
受控拉挤工艺,包括现场质量控制
  • 批准号:
    289466965
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Shape variable foil bearings
形状可变箔片轴承
  • 批准号:
    280508116
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Coordination Funds
协调基金
  • 批准号:
    250827808
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Units
Sound radiation of complex mode shapes
复杂振型的声辐射
  • 批准号:
    256895788
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Moden- und richtungsselektive Anregung, Empfang und Auswertung von symmetrischen oder antisymmetrischen Lambwellenmoden
对称或反对称兰姆波模式的模式和方向选择性激励、接收和评估
  • 批准号:
    84600242
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Verständnis für die Wirkungsweise CNT-basierter Aktuatoren
了解基于 CNT 的执行器的工作原理
  • 批准号:
    84191004
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Coordination Funds
协调基金
  • 批准号:
    434189880
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Units
Active sound irradiation reduction into cavities
减少进入空腔的主动声辐射
  • 批准号:
    381936987
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
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