Rayleigh-Taylor-instability experiments with elastic-plastic materials
- Lehigh Univ., Bethlehem, PA (United States)
- Missouri Univ. of Science and Technology, Rolla, MO (United States)
A rotating wheel experimental facility was developed to investigate incompressible Rayleigh-Taylor instability in elastic-plastic materials. A soft solid (mayonnaise) was chosen as the elastic-plastic material for experiments; material properties that include shear modulus and yield strength were fully characterized using a vane spindle type rheometer. Initial perturbations of varying amplitudes and wavelengths were generated on the interface of the soft solid using sinusoidal cutting guides. A backlit imaging technique was used in conjunction with a high-speed camera to track the motion of the interface at various phases of the instability. Results for both two- and three-dimensional perturbations were compared to study the acceleration required for instability and the growth after the interface yielded. Exponential growth rates were observed after instability was reached with trends of increasing growth rates for lower initial amplitudes. It was found that the acceleration required for instability increased when initial amplitude and wavelength decreased. Three-dimensional interfaces were found to be more stable. For both cases, a decrease in initial amplitude produced a more stable interface that increased the threshold acceleration required for the instability. Critical amplitude conditions for instability were calculated and compared with various analytical models and other experimental results.
- Research Organization:
- Lehigh Univ., Bethlehem, PA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0003195; 370333
- OSTI ID:
- 1614555
- Alternate ID(s):
- OSTI ID: 1511513; OSTI ID: 1841257
- Journal Information:
- Physical Review E, Vol. 99, Issue 5; ISSN 2470-0045
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Turbulent mixing and transition criteria of flows induced by hydrodynamic instabilities
|
journal | August 2019 |
Stability boundaries for the Rayleigh-Taylor instability in accelerated elastic-plastic solid slabs
|
journal | December 2019 |
Similar Records
Three-dimensional blast-wave-driven Rayleigh-Taylor instability and the effects of long-wavelength modes
Classical Rayleigh Taylor experiments on Nova