Application of Vibration Correlation Technique for Open Hole Cylinders
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Дата
2016
ORCID
DOI
Науковий ступінь
Рівень дисертації
Шифр та назва спеціальності
Рада захисту
Установа захисту
Науковий керівник
Члени комітету
Видавець
NTU "KhPI"
Анотація
As non-destructive method for axial buckling load determination - Vibration Correlation Technique (VCT)
showed major advantages for a range of industrial application. Particular technique for validation of
structural limit state in accordance to numerical model prediction for large (true) scale structures are getting
the required momentum. The Vibration Correlation Technique (VCT) allows to correlate the ultimate load or
instability point with rapid decrement of self-frequency response. Nevertheless this technique is still under
development for thin-walled shells and plates. The current research discusses an experimental verification of
extended approach, applying vibration correlation technique, for the prediction of actual buckling loads on
unstiffened isotropic cylindrical shells with circular cut-outs, loaded in axial compression. Validation study
include several aluminium cylinders which were manufactured and repeatedly loaded up to instability point. In
order to characterize a correlation with the applied load, several initial natural frequencies and mode shapes
were measured during tests by 3D laser scanner. Results demonstrate that proposed vibration correlation
technique allows one to predict the experimental buckling load with high reliability, by loading up to % of
ultimate load. Additional experimental tests including geometric imperfections from initial manufacturing and
postbuckling mode shape are currently under development to further validation ofproposed approach.
Опис
Ключові слова
vibration correlation technique, buckling, thin-walled structures, cylindrical shells
Бібліографічний опис
Skukis E. Application of Vibration Correlation Technique for Open Hole Cylinders / E. Skukis, K. Kalnins, O. Ozolins // Nonlinear Dynamics–2016 (ND-KhPI2016) : proceedings of 5th International Conference, dedicated to the 90th anniversary of Academician V. L. Rvachev, September 27-30, 2016 = Нелінійна динаміка–2016 : тези доп. 5-ї Міжнар. конф., 27-30 вересня 2016 р. – Kharkov : NTU "KhPI", 2016. – P. 377-383.