Investigations on imperfection sensitivity and deduction of improved knock-down factors for unstiffened CFRP cylindrical shells
Source abstract
Abstract
In the field of aerospace engineering but also in the fields of civil and mechanical engineering the industry demands for significantly reduced costs for development and operating. Reduction of structural weight at safe design is one avenue to achieve this objective. In many cases it results in thin-walled structures, which are prone to buckling if subjected to compression or shear. The presented paper is based on a recent European Space Agency (ESA) study, conducted at DLR Braunschweig, on Probabilistic Aspects of Buckling Knock-Down Factors and contributes to this goal by striving for an improved buckling knock-down factor (the ratio of buckling loads of imperfect and perfect structures) for unstiffened CFRP cylindrical shells. Buckling tests and buckling simulations were performed to investigate the imperfection sensitivity and to validate the applied simulation methodologies. Test results as well as deterministic and probabilistic buckling simulation results are presented and compared. Finally, improved knock-down factors are deduced and discussed.
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Research context
OpenAlex topics: Probabilistic and Robust Engineering Design · Composite Structure Analysis and Optimization · Structural Response to Dynamic Loads
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References (30)
Show source-provided references
1. Koiter WT. On the stability of elastic equilibrium, NASA-TT-F-10833; 1967.
2. Stability of circular cylindrical steel shells under combined loading10.1016/S0263-8231(02)00006-X ↗
3. Direct evaluation of the ‘worst’ imperfection shape in shell buckling10.1016/S0045-7825(97)00055-8 ↗
4. The influence of circumferential weld-induced imperfections on the buckling of silos and tanks10.1016/S0143-974X(00)00027-4 ↗
5. Future directions and challenges in shell stability analysis10.1016/S0263-8231(02)00024-1 ↗
6. Hühne C, Rolfes R, Tessmer J. A new approach for robust design of composite cylindrical shells under axial compression. In: Proceedings of the international ESA conference, Nordwijk; May 12, 2005.
7. Robust design of composite cylindrical shells under axial compression—simulation and validation10.1016/j.tws.2008.01.043 ↗
8. Zimmermann R. Buckling research for imperfection tolerant fibre composite structures. In: Proceedings of conference on spacecraft structures, material and mechanical testing, Noordwijk, The Netherlands: ESA SP-386; 27–9 March 1996.
9. R. Zimmermann, Optimierung axial gedrückter CFK-zylinderschalen, fortschrittsberichte VDI, Nr. 207; 1992.
10. Seide P, Weingarten VI, Petersen JP. NASA/SP-8007, Buckling of thin-walled circular cylinders. Nasa space vehicle design criteria (structures), NASA, Washington, DC, United States; September 1965.
11. Elastic stability of thin-walled cylindrical and conical shells under axial compression10.2514/3.2893 ↗
12. Reuter R, Gärtner T. Stochastische Crashsimulation mit LS-DYNA am Beispiel des Kopfaufpralls nach FMVSS 201, 17 CAD-FEM Users meeting, Sonhofen; 1999.
13. Reuter R, Hülsmann J. Achieving design targets through stochastic simulation. In: 8th international MADYMO users conference, Paris; 2000.
14. Klein M, Schuëller GI, Deymarie P, Macke M, Courrian P, Capitanio RS. Probabilistic approach to structural factors of safety in aerospace. In: Proceedings of the international conference on spacecraft structures and mechanical testing, Cépadués-Editions, ∗∗2–210, Paris, France; 1994. p. 679–93.
15. Sickinger C, Herbeck L, Breitbach E. Structural engineering on deployable CFRP booms for a solar propelled sailcraft. In: 54th international astronautical congress, Bremen, Germany; 28 September, 3 October 2003.10.2514/6.IAC-03-I.4.05 ↗
16. Velds E. TUD/LR/ASCM graduation thesis, a deterministic and probabilistic approach to finite element buckling analysis of imperfect cylindrical shells; May 2002.
17. Toward a probabilistic preliminary design criterion for buckling critical composite shells10.2514/1.11368 ↗
18. COCOMAT – improved material exploitation at safe design of composite airframe structures by accurate simulation of collapse10.1016/j.compstruct.2005.11.042 ↗
19. www.cocomat.de.
20. POSICOSS – improved postbuckling simulation for design of fibre composite stiffened fuselage structures10.1016/j.compstruct.2005.11.041 ↗
21. www.posicoss.de.
22. Experiments on buckling and postbuckling of thin-walled CFRP Structures using advanced measurement systems10.1142/S0219455407002253 ↗
23. Some simple solution for buckling loads of thin and moderately thick cylindrical shells and panels made of laminated composite material10.1016/S1270-9638(97)90023-7 ↗
24. Chakravarti · 1967 · vol. 1
25. Snedecor · 1989
26. Buckling tests with axially compressed unstiffened cylindrical shells made from CFRP
27. Geier B, Klein H, Zimmermann R. Experiments on buckling of CFRP cylindrical shells under non-uniform axial load. In: Proceedings, int. conference on composite engineering, ICCE/1; 28–31 August 1994.
28. Hühne C, Zimmermann R, Rolfes R, Geier B. Loading imperfections – experiments and computations. Euromech colloquium 424, Kerkrade, The Netherlands; 2–5 September 2001.
29. Albus J, Gomez-Garcia J, Oery H. Control of assembly induced stresses and deformations due to waviness of the interface flanges of the ESC-A upper stage. In: 52nd international astronautical congress, Toulouse, France; 1–5 October 2001.
30. Franke · 1987