Behavior of porous beryllium under thermomechanical loading. Part 1. Summary of results
The complex mechanical response of plasma-sprayed beryllium with 10 to 15% initial porosity to various static and dynamic loading conditions was studied. This combined experimental-theoretical program resulted in a calculational model capable of accurately predicting the propagation and attenuation of stress waves in porous beryllium. The program also included development of improved measuring techniques for both gas-gun and electron-beam experiments involving porous materials. Porous beryllium samples in the as-sprayed condition and after sintering were used in a comprehensive set of static (0 to 4 GPa) and dynamic (0 to 33 GPa) mechanical loading experiments. Microstructural analyses of the effects of pressure and specimen preparation on grain size, grain morphology, and void distribution were performed. Both types of porous beryllium were also exposed to high-energy, pulsed electron beams to determine the effects of rapid heating. The results of the experiments guided a modeling effort which added several new features to previous porous-material models, including deviatoric stresses, porosity-dependent pore closure relaxation time, elastic-plastic reopening of pores, and improved compaction functions. Wave profiles generated in plate-impact experiments were used to test the accuracy of the calculational model whose input parameters were determined from other experimental conditions. Excellent agreement was achieved between the predicted and experimental wave profiles. The use of thin layers of porous materials as protection against high-intensity short-duration shock waves arising from either mechanical impact or sudden heating are discussed.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6667352
- Report Number(s):
- UCRL-51782(Pt.1); TRN: 78-017261
- Country of Publication:
- United States
- Language:
- English
Similar Records
Response of porous beryllium to static and dynamic loading
The role of micro-inertia on the shock structure in porous metals
Related Subjects
BERYLLIUM
POROSITY
SPRAYED COATINGS
GRAIN SIZE
MATHEMATICAL MODELS
MICROSTRUCTURE
PLASMA ARC SPRAYING
THERMODYNAMIC PROPERTIES
ALKALINE EARTH METALS
COATINGS
CRYSTAL STRUCTURE
DEPOSITION
ELEMENTS
METALS
PHYSICAL PROPERTIES
SIZE
SPRAY COATING
SURFACE COATING
360103* - Metals & Alloys- Mechanical Properties