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Reliable and practicable analysis methods for the postbuckling behaviour of thin composite plates and shells with longitudinal stiffeners under complex loading conditions

复杂荷载条件下带纵向加劲肋复合材料薄板壳后屈曲行为可靠实用的分析方法

基本信息

批准号：
399128978
负责人：
Professor Dr.-Ing. Christian Mittelstedt
金额：
--
依托单位：
Fachgebiet Konstruktiver Leichtbau und Bauweisen
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/399128978?language=en
关键词：
Reliable practicable analysis methods postbuckling

项目摘要

In many technical applications in which thin-walled structures in the form of stiffened plates and shells are employed (i.e. aeronautics and astronautics, marine engineering, civil engineering, and general lightweight engineering), the last decades have seen a revolutionary shift from traditional metallic structures to the application of composite materials, e.g. in the form of fiber reinforced plastics. Very often, composite structures are being applied in the form of thin layered structures, so-called laminates. Quite naturally, due to their thin-walled nature the analysis and design of such laminated composite structures requires an in-depth analysis of their stability behavior where the investigation of the stability behavior of composite materials is still a rather new field where a good number of open questions still exists the investigation of which is the focus of the present research proposal. For plates and shells with various stiffening patters (using open-profile and close-profile stiffeners) and boundary conditions under uniaxial and biaxial compressive load, shear load, transverse pressure and the combinations thereof, closed-form analytical and semi-analytical analysis methods for the assessment of the buckling and postbuckling behavior shall be developed, based on adequate formulations for the buckling and postbuckling modes in conjunction with the Ritz-method.

在许多采用加筋板和壳形式的薄壁结构的技术应用中(即航空航天、海洋工程、土木工程和一般轻量化工程)，在过去的几十年里，从传统的金属结构到复合材料的应用发生了革命性的转变，例如纤维增强塑料的形式。通常，复合结构是以薄层结构的形式应用的，即所谓的层合板。由于复合材料的薄壁性质，分析和设计这种层合结构需要对其稳定行为进行深入的分析，而复合材料的稳定行为的研究仍然是一个相当新的领域，仍然存在许多悬而未决的问题，这也是本文研究的重点。对于在单轴和双向压缩载荷、剪切载荷、横向压力及其组合作用下具有各种加劲形式(使用开型和闭型加劲肋)和边界条件的板壳，应基于适当的屈曲和后屈曲模式的公式，结合里兹法，发展用于评估屈曲和后屈曲行为的闭式解析和半解析分析方法。