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Abstract: Hydrogen
is known to cause early failure of certain structural materials in a process known as
hydrogen embrittlement (HE). Most hydrogen-containing vessels- pipes and valves- suffer
from cyclic loading resulted from pressure changes thus raising long-term safety
concerns. This work aims to explorer the potential use of a thermography-assisted
fatigue testing technique and studies ... read morethe fatigue properties of three materials. Both
type 304 and 201LN stainless steels were found to be strengthened in hydrogen and their
fatigue life was increased by a factor of 100. Type 201 nickel alloy on the other hand
did not exhibit a significant change in fatigue life. Models are proposed to establish
the correlation between thermal and fatigue behaviors in order to assess cumulative
damage by analyzing the sample temperature profile during both short and long-term
testing. The use of thermographic analysis of rotating beam samples as a fatigue test
technique is proven to provide repeatable results independent of test cycle frequency
while reducing test times by several orders of
magnitude.
Thesis (M.S.)--Tufts University,
2011.
Submitted to the Dept. of Mechanical
Engineering.
Advisor: Douglas
Matson.
Committee: Anil Saigal, and Chris San
Marchi.
Keyword: Mechanical
Engineering.read less
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