A Kinetic Analysis of High Temperature Fatigue Crack Growth

Item

Title
A Kinetic Analysis of High Temperature Fatigue Crack Growth
Date
1981
Index Abstract
Coming Soon
Photo Quality
Not Needed
Report Number
AFWAL TR 81-4036
Creator
Liu, H. W.
McGowan, J. J.
Corporate Author
Materials Laboratory
Extent
11
Identifier
ADA104209
Distribution Classification
1
DTIC Record Exists
No
Distribution Change Authority Correspondence
None
Abstract
The increased fatigue crack growth rate at high temperature is primarily caused by environmental effects. The amount of the environmental effect depends on the penetration rate of the detrimental chemical specie relative to the crack growth rate. Depending upon the relative chemical penetration rate, there can either be no, partial, or full environmental effects. In both cases of no or full environmental effects, da/dN is not sensitive to cyclic frequency and temperature. In the case of partial environmental effect, da/dN is controlled by the rate of the transport of the detrimental chemical specie to crack tip, and da/dN is both frequency and temperature dependent. The da/dN data of IN 100, Waspaloy, and 304 stainless steel were analyzed. The data seem to support the analysis.
Report Availability
Full text available by request
Date Issued
1981-06-01
Provenance
IIT
Type
report
Format
11 pages ; 28 cm.

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