· Creep Rupture What is a Creep Test?
· Stress Rupture What is Stress Rupture?
· Cyclic Rupture
· Embrittlement Relief
· Static Notch
Creep/stress rupture tests are conducted at temperatures up to
+2200°F to either ASTM E139 (creep and smooth-bar stress rupture) or ASTM
E292 (notch tests). Temperature and creep readings are recorded by computers and
continuously monitored to insure utmost accuracy. The creep test program is
capable of recording strain readings up to 120 times per hour.
This information is utilized to maintain temperature tolerances during a test
and also to access a temperature
history report for each completed test. The test temperatures are monitored by a
centrally located multi-screen monitoring system.
Stress and creep rupture
tests are also conducted in various environments under vacuum or inert
atmospheric conditions. Maximum temperature for these tests is in excess of
+1700°F. Tests are usually performed on materials that exhibit excessive
corrosion at elevated temperatures in an air environment. The reduced section of
a creep test specimen can also be strain-gaged as a means of measuring the
amount of strain during testing.
Cyclic rupture testing is designed to load and unload a test sample at certain time intervals. The test
temperatures range from room temperature to +2200°F. Prior to starting a test,
four strain gages are attached to the test specimen to insure that bending
strains are within specification requirements.
The static notch test is performed at room temperature under a constant load for a minimum of 5 hours
to determine if the material is notch sensitive at room temperature.
The embrittlement relief
test is also performed at room temperature, but for 200 hours under a
load of some percentage of either the yield strength or ultimate tensile
strength. Typically, this test is conducted in accordance with ASTM F 519 at 75%
of the yield strength to determine if the material is susceptible to hydrogen
embrittlement.
In this department there are over 320 creep/stress rupture
machines available.
WMT&R has the capability of testing a number of various
sizes and shapes of test specimens, some of which are shown below.
We have the facilities, equipment, and expertise to meet
requests for variations of creep/stress rupture testing.
