The Overload Retardation Phenomenon of Miniature Specimens
Date Issued
2011
Date
2011
Author(s)
Liu, Tu-Chih
Abstract
Conventional fatigue test was conducted by MTS (material test system) with standard CT specimens, it would be time and cost consuming. Using miniature specimens could save material and cost ,and the high working frequency of miniature fatigue test system could save much time during fatigue testing.
The experiment materials of this study were AISI 4340 steel alloy, and 304 stainless steel. We prepared miniature fatigue specimens to observe the phenomenon of fatigue crack propagation following an tensile overload. Finally, we discussed the usage and practicability of miniature fatigue specimen testing by comparing the results between standard CT specimens and miniature specimens.
After experiments, we can find out the overload retardation phenomenon obviously and retardation modes of the two experiment materials are the same with the results of standard CT specimens. We can also predict the fatigue crack growth rate effectively before applying overload by considering the crack closure.
Subjects
fatigue
miniature specimens
fatigue crack growth
crack closure
overload retardation
Type
thesis
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