Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session O05: Strength IIRecordings Available
|
Hide Abstracts |
Chair: Robert Rudd Room: Anaheim Marriott Platinum 3 |
Wednesday, July 13, 2022 9:15AM - 9:30AM |
O05.00001: Plate Impact Richtmyer-Meshkov Instability Experiments on Vanadium, Molybdenum and Niobium Glenn Whiteman, Ben Adams, Ben Thorington-Jones, James Turner The dynamic strength of three body-centred cubic metals (vanadium, molybdenum and niobium) has been investigated using plate impact driven Richtmyer-Meshkov instability experiments. This paper presents the data from these experiments with impact stresses in the range ~ 9 -20 GPa and free surface sinusoidal shaped perturbations of wavelength ~ 250 µm and amplitudes in the range 24 – 86 µm. This technique is a sensitive method to infer the dynamic strength of materials in a high strain-rate, low pressure regime. Lagrangian hydrocode simulations with a PTW strength model have been used successfully to simulate the peak spike velocities and the determined dynamic strength is also discussed with relation to dynamic tensile (spall) strength determined from the same materials. UK Ministry of Defence © Crown Owned Copyright 2022/AWE. |
Wednesday, July 13, 2022 9:30AM - 9:45AM |
O05.00002: The investigation of RMI at an air/solid interface using Pagosa Jinlian Ren, Xia Ma, Brandon Smith, David B Culp Richtmyer-Meshkov instability (RMI) occurs when there has a baroclinic generation of vorticity resulting from the misalignment of density and pressure gradients on a density-stratified interface. Accelerated by the incident shock, the interface becomes unstable, fingers grow to form bubbles of light fluid, while spikes are formed in heavy fluid. RMI is a key problem in many fields, such as deflagration-to-detonation transition (DDT) as well as inertial confinement fusion (ICF) and supernovae explosions. Therefore, its research is of scientific and engineering significance. This work will investigate the Richtmyer-Meshkov instability at a solid/air interface using a hydrocode Pagosa. We first verify the ability of Pagosa to handle the Rayleigh-Taylor instability (RTI) and the RMI at an air/SF6 interface. Subsequently, we explore the RMI at a solid/air interface. The ultimate goal is to assess the effect of the initial perturbation (including the wavenumber, the amplitude etc) , the initial solid-gas ratio, the solid-material yield stress on the interface behavior. |
Wednesday, July 13, 2022 9:45AM - 10:00AM |
O05.00003: Tamped Richtmyer-Meshkov Instability Experiments to Probe Material Strength Tracy J Vogler, Travis J Voorhees, Brittany Branch, Seth Root, Matthew C Hudspeth, Joseph D Olles Dynamic interface instabilities including the Kelvin-Helmoltz (shear), Rayleigh-Taylor (acceleration), and Richtmyer-Meshkov (shock) instabilities play important roles in such varied conditions as explosive welding, inertial confinement fusion, and supernovae. Besides their importance to those applications, the emergence and development of these instabilities are influenced by the properties of the materials involved. Thus, they can be used as a way to study material behavior for unrelated applications. For example, Rayleigh-Taylor instability growth driven by lasers or explosive products has been used to study the high-pressure high-strain rate response of metals, and Richtmyer-Meshkov instabilities (RMI) growth has been used to study the strength of metals at high strain rates and low pressures. Recently, tamped RMI experiments have extended the approach to elevated pressures by tamping with a liquid. If the behavior of the jetting material is known, the tamped RMI experiment can also be used to study the behavior of the tamping material. Effectively, it becomes a dynamic indentation/penetration experiment. This is especially useful when the tamping material is not a ductile metal suited to instability growth. Here, we explore scaling relationships for tamped RMI configurations through simulations. We also show results for strengths of metals. Then, with the behavior of the metal driver known, the RMI is used to characterize the strength of granular quartz used as a tamper material |
Wednesday, July 13, 2022 10:00AM - 10:15AM |
O05.00004: Measuring the Strength of Metals by Extending the Richtmyer-Meshkov Instability to Shockless Loading Corbett Battaile, Brittany Branch, Justin L Brown, Steven W Dean, Joshua M Usher In this study we examine and compare two closely related approaches for quantifying the strength of metals at high strain-rates and relatively low pressures. In the first, specimens are patterned with sinusoidal perturbations on one surface, and impacted on the other by a projectile fired from a gas gun. The shock wave that propagates through the material achieves strain rates in excess of 107 1/sec and induces a Richtmyer-Meshkov Instability (RMI) that initiates an inversion of the sinusoidal pattern. The nature and extent of this inversion, and in particular its arrest (or perhaps lack thereof), reveals information about the material's strength. The second method is similar, but utilizes pulsed-power on Sandia's Thor platform to induce a shockless loading path that results in strain rates up to about 106 1/sec and produces a similar inversion of the patterned surface. This method can provide strength information in regimes between those explored by Hopkinson bar and traditional RMI. In this presentation we will provide an overview of RMI and its counterpart in the shockless loading regime, describe the use of simulations to quantify strength in loading conditions from gas-gun and Thor experiments on steel and tin, and discuss strategies for using simulations to meaningfully interpret measurements and infer strength. |
Wednesday, July 13, 2022 10:15AM - 10:30AM |
O05.00005: Static and Dynamic Compression and Deformation Behavior of High-Entropy Transition Metal Borides Seth Iwan, Yogesh K Vohra, Christopher S Perreault, Patricia Kalita High-entropy transition metal boride (HEB) sample (Hf, Mo, Nb, Ta, Zr)B2 with unit cell volume V0 = 28.2 Å3 was synthesized under high-pressure and high-temperature in a large-volume Paris-Edinburgh cell at HPCAT, Argonne National Laboratory and the sample was recovered for subsequent static and dynamic compression studies. The hexagonal AlB2 structure of HEB sample was found to be stable up to 240 GPa in a diamond anvil cell study employing platinum as a pressure marker. The average nanoindentation hardness of the recovered sample is 20 GPa. The compressive yield strength or maximum differential stress of the HEB sample was measured by radial x-ray diffraction technique in a Panoramic diamond anvil cell at HPCAT to 60 GPa. The measured compressive yield strength approached 8% of the shear modulus at the highest pressure of 60 GPa. Future shock compression experiments are planned on THOR at Sandia. |
Wednesday, July 13, 2022 10:30AM - 10:45AM |
O05.00006: Laser-driven Rayleigh-Taylor strength measurements in solid copper at extreme conditions along two different adiabatic paths Yong-Jae Kim, Tom Lockard, James M McNaney, Robert E Rudd, Camelia V Stan, Hye-Sook Park We study copper strength at extreme conditions by using Rayleigh-Taylor (RT) strength instability experiments on the Omega EP laser facility. We create two different adiabatic paths by two different pulse shapes; one at ~4500K and another at ~800K, while their peak pressures are kept at ~150 GPa. The pulse shapes are designed not to melt the copper sample thus the strength measurements are valid. The strength is inferred by suppression of the RT growth of pre-imposed ripples by analyzing face-on radiographic images. We use three different methods to understand the systematic error of the growth factor measurements. The experimental results will be described in comparison with the commonly used Steinberg-Guinan model. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700