The Hydrogen Effects on Materials Laboratory is a national resource for mechanical testing of materials in high-pressure gaseous hydrogen. The laboratory includes a range of specialized assets for evaluating materials performance in high-pressure gaseous hydrogen:
- Thermal Precharging – Materials and test specimens are exposed to high-pressure gaseous hydrogen (up to 140 MPa) at elevated temperature (up to 300 ˚C) before subsequent evaluation.
- Static-load Crack Growth Testing – Instrumented specimens subjected to constant-displacement loading (e.g., wedge-opening load specimens) are exposed to gaseous hydrogen at pressure up to 200 MPa and temperatures over the range of -70 ˚C to 170 ˚C. The material properties measured are the crack velocity and subcritical cracking threshold.
- Dynamic-load Testing – Specimens are exposed to gaseous hydrogen at pressure up to 140 MPa while concurrently subjected to different loading formats, e.g., monotonically increasing or cyclic. Material properties measured include tensile strength and ductility, fatigue strength, fatigue crack growth rates, and subcritical cracking thresholds under rising loading.