Free-edge effects in curved composite laminates: analysis, optimization and test
弯曲复合材料层压板中的自由边缘效应:分析、优化和测试
基本信息
- 批准号:427624054
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2019
- 资助国家:德国
- 起止时间:2018-12-31 至 2022-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In many application cases, curved laminated structures fail by delaminations which are triggered by interlaminar peeling stresses that arise due to the curvature. Further, in laminated composite struc-tures localized and potentially singular stress fields arise in the vicinity of the free laminate edges which add to the delamination criticality of a composite laminate. As of today there are only purely numerical means of analysis available by which free-edge stress fields in curved laminated struc-tures can be assessed. Consequently, this research proposal is devoted to the development of closed-form analytical and semi-analytical methods for the analysis of free-edge effects in curved composite laminates. Closed-form analytical approximate methods can be developed by using various strategies where the assessment of stress resultants in the form of layerwise delamination forces and moments is the most simple and straightforward one. Furthermore, layerwise stress based approaches in the form of the so-called force-balance-method can be employed as well. Lastly, it is intended to use layerwise displacement based analysis approaches. All analysis methods will be verified by comparative finite element simulations. Furthermore, all analysis methods will be validated by means of experimental results. As soon as approximate closed-form analytical methods have been established, the free-edge effect in curved laminated will be considered as an optimization problem. By using the methods of mathematical programming it will be explored which optimization potential can be exploited in the case of curved laminated structures and if free-edge effects can be minimized. The quality of the developed analysis approaches and the results of the optimization procedures will be assessed by tests performed on specimens of curved laminates.
在许多应用情况下,弯曲的层压结构由于分层而失效,分层由由于曲率而产生的层间剥离应力触发。此外,在复合材料层合结构中,在自由层合板边缘附近出现局部和潜在的奇异应力场,这增加了复合材料层合板的脱层临界性。迄今为止,只有纯数值分析方法可以用来计算弯曲层合结构的自由边应力场。因此,本研究建议致力于发展分析弯曲复合材料层合板自由边缘效应的封闭形式的解析和半解析方法。闭合形式的分析近似方法可以通过使用各种策略来开发,其中以分层力和力矩的形式评估应力合成物是最简单和直接的方法。此外,也可以采用所谓的力平衡法形式的基于分层应力的方法。最后,它是打算使用逐层位移为基础的分析方法。所有分析方法将通过比较有限元模拟进行验证。此外,所有的分析方法将通过实验结果进行验证。一旦建立了近似的解析方法,弯曲层合板中的自由边效应将被视为一个优化问题。通过使用数学规划的方法,它将探讨优化潜力可以利用的情况下,弯曲的层压结构,如果自由边缘的影响可以最小化。质量的开发分析方法和优化程序的结果将进行评估的弯曲层压板试样上进行的测试。
项目成果
期刊论文数量(0)
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科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Professor Dr.-Ing. Christian Mittelstedt其他文献
Professor Dr.-Ing. Christian Mittelstedt的其他文献
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{{ truncateString('Professor Dr.-Ing. Christian Mittelstedt', 18)}}的其他基金
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翼缘和腹板由不对称层合板制成的剪切变形复合材料层合梁的局部屈曲
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417731066 - 财政年份:2018
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