Griggs Rig

The "Griggs Rig" is a high pressure-temperature internally heated solid medium deformation apparatus, suitable for smaller samples. The machine is derived from the Tullis&Tullis (1986) design, but additionally equipped with an end-load piston coupled to the confining pressure system. Uniaxial and shear experiments can be performed.

Max. Confining Pressure: 2 GPa
Max. Principal Stress: 4 GPa

Sample Volume

uniaxial: 6.6 mm diameter, 18 mm length
shear: slices at usually 45° angle and 1-2 mm thickness within uniaxial
sample volume (6.6 mm diameter) confined by alumina forcing blocks

Confining medium: NaCl and KCl salt cells