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.

在许多技术应用中，采用了薄壁结构形式的薄壁结构（即航空和宇航员，海洋工程，土木工程和一般轻量级工程），过去几十年来，传统金属结构发生了革命性的转变用于复合材料的应用，例如以纤维增强塑料的形式。通常，复合结构以薄层结构，所谓的层压板的形式应用。自然而然地，由于其薄壁的性质，这种层压复合结构的分析和设计需要对其稳定性行为进行深入分析，在这种行为中，对复合材料的稳定性行为的研究仍然是一个相当新的领域开放问题仍然存在于本研究建议的重点。对于具有各种僵硬模式（使用开放式和封闭式加强剂）和边界条件的板和外壳，在单轴和双轴压缩载荷，剪切载荷，横向压力及其组合，封闭形式的分析和半分析分析方法下，用于基于与Ritz-Method结合使用的屈曲和后扣模式的适当配方，应制定对屈曲和后扎后行为的评估。