Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

Supersonic Microparticle Impact Experiments at Temperatures Approaching 2000 °C

Jamshid Ochilov, Isaac Faith Nahmad, Intekhab Alam, Peter Yip, vand Suraj Ravindran

Abstract

Experiments at extreme strain rates and temperatures are critical for characterizing materials in high-speed applications. In this study, we develop a laser-driven particle impact platform capable of accelerating microparticles to supersonic velocities and impacting targets heated to temperatures approaching 2000 °C. The conventional laser-induced particle impact testing (LIPIT) system has been modified to enable high-temperature experiments through the integration of a resistive heating system and the development of a robust launch pad assembly suitable for accelerating particles in high-temperature environments. To eliminate the oxidation of materials at elevated temperatures, an optically accessible portable vacuum chamber has been developed and integrated into the setup. The capabilities of the system are demonstrated through a study of the temperature dependent particle impact cratering behavior of POCO graphite. With this new platform, high-velocity, high-temperature impact experiments can be performed in a controlled environment, supporting the investigation of materials under extreme conditions.

Supersonic Microparticle Impact Experiments at Temperatures Approaching 2000 °C

Abstract

Experiments at extreme strain rates and temperatures are critical for characterizing materials in high-speed applications. In this study, we develop a laser-driven particle impact platform capable of accelerating microparticles to supersonic velocities and impacting targets heated to temperatures approaching 2000 °C. The conventional laser-induced particle impact testing (LIPIT) system has been modified to enable high-temperature experiments through the integration of a resistive heating system and the development of a robust launch pad assembly suitable for accelerating particles in high-temperature environments. To eliminate the oxidation of materials at elevated temperatures, an optically accessible portable vacuum chamber has been developed and integrated into the setup. The capabilities of the system are demonstrated through a study of the temperature dependent particle impact cratering behavior of POCO graphite. With this new platform, high-velocity, high-temperature impact experiments can be performed in a controlled environment, supporting the investigation of materials under extreme conditions.
Paper Structure (13 sections, 11 figures, 2 tables)

This paper contains 13 sections, 11 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Materials and Methods
  3. Experimental Methods
  4. Beam Manipulation Optical Train
  5. Launch Pad Assembly: Design for Extreme Temperatures
  6. Target Mount and Resistive Heating System
  7. Vacuum Chamber: Design and Integration
  8. High-speed Microscopic Imaging System
  9. Application: Graphite Case Study
  10. Experiments in Atmospheric Conditions
  11. Experiments under Vacuum
  12. Summary and Conclusion
  13. COMSOL Simulations of Resistive Heating

Figures (11)

  • Figure 1: Schematic of the experiment setup.
  • Figure 2: Particle impact (LIPIT) facility with experiment capabilities at ultra-high temperatures and under high vacuum.
  • Figure 3: Launch pad assembly: exploded view of the layup sequence cross-section shown along with the incident beam and launch mechanism.
  • Figure 4: Particle launch velocity vs. laser pulse energy for 100 µm aluminum and 40 µm copper foil as expansion layers driving nominally 60 µm alumina, 80 µm tungsten carbide, and 100 µm stainless steel microspheres. 25.4 $\times$ 25.4 mm$^2$ launch pad surface containing 8 post-mortem launch sites, and a magnified launch site is overlaid.
  • Figure 5: (a) Target mount assembly for experiments in the atmosphere. (b) Launch pad and target mount experiment configuration. (c) Rear particle alignment camera and (d) high-speed camera view of a 60 µm particle on launch pad surface. (e) IR camera view of the mounted target sample.
  • ...and 6 more figures