Structural Dynamic Considerations for a Hydrocode Analysis of Hypervelocity Test Sled Impacts

Szmerekovsky, Andrew; Palazotto, Anthony N.

doi:10.2514/1.13803

Cited by 35 publications

(4 citation statements)

References 8 publications

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“…The high-speed rocket sled is a remarkable and precise piece of ground testing equipment that was developed in the mid to late 20th century. It can solve a range of performance test issues encountered during aircraft aerodynamic experiments in high-speed and high-load environments [1][2][3][4]. In contrast to wind tunnel tests that employ scaled-down models, the rocket sled is tested using a full-scale model of the aircraft.…”

Section: Introductionmentioning

confidence: 99%

Simulation of flow field characteristics in gap between high-speed rocket sled slipper and track

Dang

2023

Materials Research Proceedings

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Abstract. Accurate simulation of flow field characteristics within the gap between the slipper and track is essential for the prevention of aerodynamic heat damage to high-speed rocket sleds. A three-dimensional structured mesh was utilized to establish the flow field model in the slipper-track gap, while computational fluid dynamics was employed for simulating the flow field movement. The results revealed that the bow shock wave at the head of the rocket sled has a significant influence on the flow field characteristics within the gap. Specifically, the velocity of the mainstream in the gap initially exhibited an increasing trend, followed by a decreasing trend, and then a re-increase. Conversely, the mainstream temperature displayed a decreasing trend initially, followed by an increasing trend, and then a decrease once more. The air compression within the slipper-track gap resulted in remarkably high temperatures, with the maximum temperature reaching 1160 K at Ma = 4 in the immediate vicinity of the slipper. The current investigation provides valuable insights that can guide future research on the structural characteristics of slippers in high-temperature environments.

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Section: Introductionmentioning

confidence: 99%

Simulation of flow field characteristics in gap between high-speed rocket sled slipper and track

Dang

2023

Materials Research Proceedings

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“…Mixon statistically analyzed data (e.g., sled velocities at the onset of gouging as well as the locations, quantities, and sizes of gouges) obtained from different rocket sled tests and, on this basis, inferred that the traveling velocity of the rocket sled, rail surface roughness, frictional heat, and impact force are the principal factors that induce gouging [10]. Using numerical analysis methods, Tachau et al studied gouging in rocket sled rails, analyzed the causes and development of gouging, and put forward methods to mitigate gouging from material and structural perspectives [5,6,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Study of Rail Gouging during Hypersonic Rocket Sled Tests

Zhou

Yan

Chen

et al. 2022

Advances in Materials Science and Engineering

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Gouging—an obstacle to the development of hypersonic rocket sled test techniques—was mechanistically investigated through experimental and theoretical analyses. Typical gouges were analyzed using macroscopic and microscopic experiments to investigate the evolution of gouging. Quasistatic compression and Hopkinson bar experiments were performed to systematically study the thermoviscoplastic properties of U71Mn rail steel under wide ranges of the strain rate and temperature. The critical condition for gouging was derived based on a thermoviscoplastic constitutive model supplemented by a three-variable criterion for an adiabatic shear instability. The results showed the following. (1) Adiabatic shear bands (ASBs) form when stress reduction under the combined action of frictional heating and high-speed deformation exceeds the strain-hardening effect of the rail material. (2) The nonuniform deformation of the edges of ASBs leads to the generation of cracks that split the rail surface. As the ASBs expand, the cracks grow and coalesce, eventually causing the material to peel off, forming gouges. (3) The relationships among the temperature, strain rate, and strain at the onset of gouging can be determined based on the critical condition for the formation of ASBs in rail steel.

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“…A hypersonic rocket sled is a large, high-precision ground-test equipment mainly used to solve a series of test problems associated with aerodynamics, structure, control, fuse, engine ignition, and damage encountered by aircraft at high speeds and in large-overload environments [1][2][3][4][5][6][7]. In a hypersonic rocket sled test, a solid rocket engine is used as the power source to push the rocket sled along a high-precision straight track at a hypersonic speed.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Hypersonic Rocket Sled Considering Friction and Wear

Dang¹,

Liu²,

Zhou

et al. 2022

Journal of Spacecraft and Rockets

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The dynamic response of a hypersonic rocket sled was studied by considering the timevarying friction coefficient and the gap caused by wear between the slipper and track. A multi-body dynamic model for a hypersonic rocket sled system was established by considering the time-varying mass and moment of inertia, nonlinear aerodynamic loads, engine thrust, track irregularity, and nonlinear contact force. As for the wear calculation, the ductile and shear criteria were used as the material damage criteria, and slipper wear was determined by the number of damaged elements. A rocket sled test was also carried out, and the dynamic response of the sled was measured. The results showed that the computational sliding displacement and velocity of the third-stage sled matched well with the test values. The computational root mean square (RMS) values of the vertical acceleration of the third-stage sled front slipper considering friction and wear matched better with the test values than with the case without considering friction and wear, which underestimated the RMS value by approximately 20.1% at Mach 5. The importance of considering friction and wear and the correctness of the computational method were

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Structural Dynamic Considerations for a Hydrocode Analysis of Hypervelocity Test Sled Impacts

Cited by 35 publications

References 8 publications

Simulation of flow field characteristics in gap between high-speed rocket sled slipper and track

Simulation of flow field characteristics in gap between high-speed rocket sled slipper and track

Mechanistic Study of Rail Gouging during Hypersonic Rocket Sled Tests

Dynamic Response of a Hypersonic Rocket Sled Considering Friction and Wear

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