Further Refinement and Validation of Material Models for Hypervelocity Gouging Impacts

Cinnamon, John D.; Palazotto, Anthony N.; Szmerekovsky, Andrew

doi:10.2514/1.25035

Cited by 10 publications

(1 citation statement)

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“…When the traveling velocity of a rocket sled approaches the hypersonic velocity, "raindrop"-or "spindle"-shaped gouges sometimes appear on the surface of the rail in contact with the slippers of the sled. is phenomenon rst began to garner attention during rocket sled tests conducted in the United States in 1968 and was subsequently referred to as gouging [3,4]. e occurrence of gouging sharply deteriorates the mechanical environment and, in severe cases, can even lead to rail fracture and the failure of a rocket sled test.…”

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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Section: Introductionmentioning

confidence: 99%