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Center for Structures in Extreme Environments

Center for Structures in Extreme Environments. Haym Benaroya, benaroya@rci.rutgers.edu. MAE Open House SoE 12 March 2008. Offshore structures Aircraft structures Lunar and Martian structures Nanostructures. Structural modeling Force modeling Uncertainties definition

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Center for Structures in Extreme Environments

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  1. Center for Structures in Extreme Environments Haym Benaroya, benaroya@rci.rutgers.edu MAE Open House SoE 12 March 2008

  2. Offshore structures Aircraftstructures Lunar and Martian structures Nanostructures Structural modeling Force modeling Uncertainties definition Reliability and life estimates Research Focus of Center

  3. Disciplinary Focus of Center • Primary • structural dynamics • & environmental modeling • multi-disciplinary engineering • Secondary • economics and finance • policy • sociology • psychology

  4. Nonlinear Nanoresonator Dynamics: Sensors & Mechanisms

  5. Aircraft structures Research Focus of Center

  6. Aircraft Structures Small fuselage section between consecutive frames and stringers (SP) Panel of an LD-3 luggage container (LP) SP: Al 2024-T3 20 x 8 x 0.063 in LP: Al 7021-T6 59 x 57.5 x 0.16 in

  7. Example of Box Shaped Model I LD-3 luggage container after internal bomb blast Pressure loading of Fleisher (1996) • 2.01 m x 1.57 m x 4 mm (Panel III) • 1.53 m x 1.63 m x 4 mm (Panel IV) • Clamped Al 7021-T6 Plate

  8. Elastic Deformation Pattern Assumed form of elastic plate deflection Elastic sinusoid deformation pattern Clamped plate SDOF equation of motion General form of yield criterion

  9. Plastic Deformation Pattern Analytical idealization of experimental profile Experimental deformation profile of Jones et al. (1970) • All energy is dissipated in the edges and five plastic hinges. General equation of motion

  10. Smaller Panel Standard Deviation Bounds Mean deflection of SP subjected to SC with bounds Mean deflection of SP subjected to LC with bounds

  11. Larger Panel Standard Deviation Bounds Mean deflection of LP subjected to SC with bounds Mean deflection of LP subjected to LC with bounds

  12. Monte Carlo method can also be used to estimate the probability of structural failure. Based on maximum strain criterion. All failures for LC/SP case. No failures for SC/LP case. Probability of Failure LC/LP SC/SP Probability of failure for SC/SP and LC/LP cases

  13. Lunar and Martian structures Research Focus of Center

  14. Extraterrestrial Structures Extraterrestrial structures such as those appropriate for the Moon and Mars present added difficulties due in part to: • the lack of atmosphere • the large distance from safety • often intense radiation • micrometeorites • extreme temperatures and temperature fluctuations

  15. Base Layout Structural Design of a Lunar Base

  16. Offshore structures Research Focus of Center

  17. Using a technologically innovative compliant tower, the Baldpate Field, on Garden Banks 259/260, was brought on stream in 1998. Heidrn Platform

  18. Equatorial Guinea • The Okume Complex is comprised of the Okume, Oveng, Ebano and Elon fields which have been developed using a combination of two tension leg platforms and four fixed platforms.

  19. Norway’s Valhall field Denmark's South Arne

  20. Tension Leg Platform (TLP) Schematic of a TLP Ram-Powel TLP in Gulf of Mexico (built in 1997 in 3,214 ft of water)

  21. Schematics of Compliant Towers Articulated Tower Tension Leg Platform

  22. Coupled Axial and Transverse Vibration with End Tension • Tower has two degrees of freedom • Tower is extensible • The tower has a Tension applied at the free end • In-plane fluid force is approximated by the Morison equation.

  23. Vortex-Induced Oscillations: Analysis and Experiments “Inverted Pendulum Model” • Hollow aluminum tube attached by a leaf spring. • d = 2.54 cm; l = 128 cm • Mass ratio = 1.53 • Damping ratio = 0.054 • fn = 1.25 Hz • Motion restricted to the cross stream plane • Deflection; qmax ≈ 1.1°

  24. In Closing: Celebration after Rutgers upsets #3 Louisville 28-25 on 11/9/06

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