Future Plans for in-situ High-Pressure Hydrogen Dynamic Mechanical Analysis (DMA)

PNNL is currently developing a novel testing capability for studying dynamic mechanical behavior of materials in a high-pressure hydrogen environment.

The testing apparatus will consist of a modified DMA drive system mounted within a hydrogen autoclave,  and outfitted with a sub-ambient temperature regulation system. Equipment power, coolant, etc., will be supplied via feedthrough ports on the autoclave. This will allow for the measurement of complex deformation and expansion during pressure cycles up to 5000 psi and temperatures from ambient to -50 °C. The drive system itself is a direct linear actuation type, capable of applying cyclic loads perpendicular to the specimen stage at frequencies ranging from 0.01 to 20 Hz and with mN scale and submicron position sensitivity. The actuating element can be fitted with various test geometry configurations (such as a hemispherical probe, parallel plate, extension, and 3- or 4-point bend).

Relevant Standards

Standard ID (prefix 'ASTM') Title Status Developed by Subcomittee Book of Standards Volume DOI Active Standard Link
D4065 - 12 Standard Practice of Plastics: Dynamic Mechanical Properties, Determination and Report of Procedures Active D20.10 8.02    
D1043 - 16 Standard Test Method for Stiffness Properties of Plastics as a Function of Temperature by Means of a Torsion Test Active D20.10 8.01    
D2990 - 17 Standard Test Methods for Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics Active D20.10 8.01    
D5279 - 13 Standard Test Method for Plastics: Dynamic Mechanical Properties: In Torsion Active D20.10 8.03    
D6272 - 17 Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point Bending Active D20.10 8.03    
D7028 - 07 (2015) Standard Test Method for Glass Transition Temperature (DMA Tg) of Polymer Matrix Composites by Dynamic Mechanical Analysis (DMA) Active D30.04 15.03