We have developed a new solid-media apparatus for performing rheological investigations at multigiga-pascal pressures. The pressure cell consists of a simple belt design and fits in a modified 250 tonne Paris-Edinburgh press. Elastic strains are measured by neutron diffraction, on the ENGIN-X experimental station at ISIS. Stresses are estimated from the measured strains in combination with published values of the elastic moduli. As an exemplair of the method, we present data from initial deformation experiments on pyrope garnet at 1.5 GPa and 873 K. Data collection times are as short as 60 min and the elastic strain resolution is better than 10(-4). We anticipate, however, that by interrupted testing, strain rates as low as 10(-9)/s, or lower, will be measurable.
A new belt-type apparatus for neutron-based rheological measurements at gigapascal pressures / Dobson, Dp; Mecklenburgh, J; Alfe, D; Wood, Ig; Daymond, Mr. - In: HIGH PRESSURE RESEARCH. - ISSN 0895-7959. - 25:2(2005), pp. 107-118. [10.1080/08957950500143500]
A new belt-type apparatus for neutron-based rheological measurements at gigapascal pressures
Alfe D;
2005
Abstract
We have developed a new solid-media apparatus for performing rheological investigations at multigiga-pascal pressures. The pressure cell consists of a simple belt design and fits in a modified 250 tonne Paris-Edinburgh press. Elastic strains are measured by neutron diffraction, on the ENGIN-X experimental station at ISIS. Stresses are estimated from the measured strains in combination with published values of the elastic moduli. As an exemplair of the method, we present data from initial deformation experiments on pyrope garnet at 1.5 GPa and 873 K. Data collection times are as short as 60 min and the elastic strain resolution is better than 10(-4). We anticipate, however, that by interrupted testing, strain rates as low as 10(-9)/s, or lower, will be measurable.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
