Sanchez Deformation Rig

Griggs Apparatus

54-1110

MIT-Sanchez

Sanchez Technologies Solid Medium Deformation Apparatus: This apparatus (acquired in 2017) is currently installed in newly renovated laboratory space in the Department of Earth, Planetary and Atmospheric Sciences (EAPS) at MIT. It is one of three existing apparatus of this type world-wide (Fig. 1). The apparatus is hydraulically driven by high-precision syringe pumps and is capable of reaching pressures of up to 2.5 GPa and temperatures of up to 1400˚C in a 1 inch diameter pressure vessel. Typical sample dimensions are 6.33 mm diameter and 12 mm length. Advanced controlling equipment allows precise control of the rate of pressurization, depressurization and heating, as well as constant load control with a nominal resolution of 0.1 MPa. The use of weak salt cells, molten salt and molten glass cells allows for a practical stress resolution of ~10 MPa. Long furnaces (50 mm) minimize temperature gradients in the sample. Data-logging equipment allows for recording of all pertinent variables (axial force, confining pressure, 2x axial displacement, temperature, heating current & voltage) at speeds up to 40kS/s per channel. This apparatus is currently being upgraded with a set of six piezoelectric needle sensors which will eventually allow us to record acoustic emission and conduct wave speed measurements in-situ during high temperature, high pressure deformation. The hydraulic drive eliminates acoustic noise caused by gear drives and allows sensitive acoustic monitoring.

Loading; Unloading; Heating; Ultra-High Temperature; High Pressure; Ultra-High Pressure; Hydrostatic Tests; HIP; Synthesis; Mineral Reactions; Local Axial Strain; Yield Strength; Failure Strength; Strength; Creep; Stepping; Triaxial Stress/Strain; Differential Stress; Acoustic Velocity; Acoustic Events; P-Wave Velocity; S-Wave Velocity