Hydrostatic compaction of Microtherm HT.

Broome, Scott Thomas ; Bauer, Stephen J.

Sandia National Laboratories

关键词: Hydrostatics;    Testing;    Porosity;    Strains;    99 General And Miscellaneous//Mathematics, Computing, And Information Science;   

DOI  :  10.2172/1044984
RP-ID  :  SAND2010-6014
RP-ID  :  AC04-94AL85000
RP-ID  :  1044984

美国|英语

来源: UNT Digital Library

【 摘 要 】

Two samples of jacketed Microtherm{reg_sign}HT were hydrostatically pressurized to maximum pressures of 29,000 psi to evaluate both pressure-volume response and change in bulk modulus as a function of density. During testing, each of the two samples exhibited large irreversible compactive volumetric strains with only small increases in pressure; however at volumetric strains of approximately 50%, the Microtherm{reg_sign}HT stiffened noticeably at ever increasing rates. At the maximum pressure of 29,000 psi, the volumetric strains for both samples were approximately 70%. Bulk modulus, as determined from hydrostatic unload/reload loops, increased by more than two-orders of magnitude (from about 4500 psi to over 500,000 psi) from an initial material density of {approx}0.3 g/cc to a final density of {approx}1.1 g/cc. An empirical fit to the density vs. bulk modulus data is K = 492769{rho}{sup 4.6548}, where K is the bulk modulus in psi, and {rho} is the material density in g/cm{sup 3}. The porosity decreased from 88% to {approx}20% indicating that much higher pressures would be required to compact the material fully.