Review of fatigue criteria development for HTGR core supports
Fatigue criteria for HTGR core support graphite structure are presented. The criteria takes into consideration the brittle nature of the material, and emphasizes the probabilistic approach in the treatment of strength data. The stress analysis is still deterministic. The conventional cumulative damage approach is adopted here. A specified minimum S-N curve is defined as the curve with 99% probability of survival at a 95% confidence level to accommodate random variability of the material strength. A constant life diagram is constructed to reconcile the effect of mean stress. The linear damage rule is assumed to account for the effect of random cycles. An additional factor of safety of three on cycles is recommended. The uniaxial S-N curve is modified in the medium-to-high cycle range (> 2 x 10/sup 3/ cycles) for mutiaxial fatigue effects.
- Research Organization:
- General Atomic Co., San Diego, CA (USA)
- DOE Contract Number:
- AT03-76ET35300
- OSTI ID:
- 5622845
- Report Number(s):
- GA-A-15320
- Country of Publication:
- United States
- Language:
- English
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360603 -- Materials-- Properties
CARBON
ELEMENTS
FATIGUE
GAS COOLED REACTORS
GRAPHITE
GRAPHITE MODERATED REACTORS
HTGR TYPE REACTORS
MECHANICAL PROPERTIES
MECHANICAL STRUCTURES
NONMETALS
REACTOR COMPONENTS
REACTOR CORES
REACTORS
STRESS ANALYSIS
SUPPORTS