STATIC TESTS
STATIC TESTS ON SMOOTH OR NOTCHED CYLINDRICAL OR TUBULAR AND HOLLOW
SPECIMENS AND FRACTURE MECHANICS TESTS IN H2 ENVIRONMENT UP TO 1500 BAR
H2 is equipped with 2 testing machines with a load capacity up to 100 kN. One machine is equipped with a 2 liter autoclave, the other is characterized by hollow equipment for hollow specimen. Both can perform tests in hydrogen and inert environments up to 1500 bar.
SSRT
Slow Strain Rate Test
Tensile test conducted on smooth or notched specimens
Most applied regulatory references: ASTM G142, ASTM G129
Characterized by a low strain rate, typically close to 1E-5 s^-1
SSRT tests on notched specimens are typically performed both in an inert environment and in hydrogen to verify the embrittlement effect of the latter on the NTS (notch tensile strength)
Hydrogen embrittlement is quantified with the RNTS (relative NTS); for example, the CHMC code requires a carbon steel to have an RNTS greater than 0.5 to be suitable for hydrogen service
JIH
Fracture mechanics test
for the determination of the J integral:
Conducted static test, conducted determination of JIc from the J-R curve
Most applied regulatory references: ASTM E1820
Similar to SSRT, it is conducted at low strain rates
The most commonly used specimen geometry is CT (compact tension)
List of applicable standard test methods:
Static tests (minimum rate of displacement 3E-7 mm/s)
ASTM G129 – SSRT (smooth)
ASTM G142 – SSRT (smooth and notched)
ASTM E399 – KIc
ISO 11114-4 – Method B – KIc
ASTM E1820 – KJc
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