Abstract
Despite several recent experimental and analytical programs on shell buckling, there is a lack of studies examining the characteristics of imperfection patterns produced by manufacturing. As a result, differing conclusions can be reached in strength assessment and in evaluating code recommendations, depending on imperfection-modeling assumptions. A number of small-scale stringer-stiffened cylinders, all manufactured by the same method, were tested at Imperial College, London, England. Prior to loading, these models were carefully measured to record their initial imperfections. Data-reduction techniques were subsequentlyy used to obtain Fourier-series representations of these surfaces. The purpose of this paper is to present the results of a detailed statistical analysis carried out on the Fourier coefficients. Both univariate and correlation statistics are presented for the variables characterizing the imperfection modes. In addition, the fitting of probability distributions is discussed and relevant parameters are presented for the dominant modes. The results show that because of the common manufacturing process several trends exist in the imperfection patterns. Thus, guidelines are developed that improve imperfection-modeling assumptions in buckling-strength analyses.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.