Development of a Reliability-Based Design Approach for Unstiffened CFRP-Cylinders under Material and Structural Uncertainties

未加筋的碳纤维圆筒是一种有趣的结构部件，适用于有极端要求的应用。对于这些薄而轻的结构，临界失效发生为屈曲。临界屈曲载荷的预测是由经验击倒系数的确定性设计方法确定的。然而，这些试验大多是对不同边界条件的金属结构进行的基础试验。对于CFRP圆柱体的设计，最终的击倒系数恰好是非常保守的。在本研究项目中，应为具有代表性的结构构件扩展试验结果的统计数据库。不同的测量技术被用来表征气缸和确定材料和结构的不确定度。除现有文献外，还应对实验结果进行分类。在研究所以前工作的基础上，结合本项目的结果，考虑结构和材料的不确定性，将进一步发展基于可靠性的无加筋CFRP圆筒设计方法。

Unstiffened CFRP-Cylinders are interesting structural components forapplications with extreme requirements. For these thin lightweightstructures the critical failure occurs as buckling. The prediction of thecritical buckling load is determined by deterministic design proceduresusing empirical knock-down factors. However these are mostly basedupon tests of metal structures with different boundary conditions. Theresulting knock-down factors happen to be very conservative for thedesign of CFRP-Cylinders. In this research project the statisticaldatabase of experimental results shall be expanded for representativestructural components. Different measurements techniques areapplied to characterize the cylinders and to determine the materialand structural uncertainties. In addition to existing literature theexperimental results shall be classified into categories. Building on theInstitutes previous work and with the results of this project a reliabilitybaseddesign approach for unstiffened CFRP-Cylinders shall befurther developed with respect to structural and material uncertainties.