10.2514/6.2018-0187">
 

Evaluation of a Nonlinear Melt Region Produced Within a High Speed Environment

Document Type

Conference Proceeding

Publication Date

1-8-2018

Abstract

The solution discussed in this paper relates to the high speed movement of a vehicle along a rigid support in which friction becomes a heat energy source for melt. The solution to the problem is through a one dimensional nonlinear heat transfer set of equations dependent upon a vertical forcing function, created by horizontal movement characterized by velocity, that considers the supersonic regime. A good example of this type of condition occurs within the USAF Holloman High Speed Test Track (HHSTT) at Alamogordo New Mexico. The HHSTT supports experiments which routinely test at hypersonic speeds. In addition, there are several applications including rail guns, high speed trains, and hypervelocity projectile research. For this research, the application is the setup at the Holloman High Speed Test Track. The testing there involves articles propelled at high velocities, in excess of Mach 8, while attached to a rail by way of wrap around slippers. The loss or failure of a slipper due to wear would lead to a catastrophic event resulting in loss of unique test articles and potentially millions of dollars. Modeling the entire test run would be computationally expensive due to thermal-mechanical coupling and non-linearities in geometry as well as material. This work utilized a finite difference scheme to solve the one dimensional heat transfer equation while accounting for the time the slipper is in contact with the rail, versus not in contact, as well as the differing pressures experienced by the slipper as it travels down the track. It also accounts for material properties that change with respect to temperature leading to non-linearities that are approximated using iterative methods. Friction is approximated using Montgomery’s results from his work in muzzle wear.1 The model output shows a direct correlation between predicted melt at the surface and the damage as measured by a slipper after the acceleration portion of a test event.

Comments

This conference paper is available from the publisher, AIAA, through subscription or purchase using the DOI link below.

Author note: Armando DeLeon was an AFIT PhD candidate at the time of this conference. (AFIT-ENY-DS-18-M-249, March 2018)

Conference Session: Nonlinear Dynamics

Source Publication

2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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