Influence function method for fracture mechanics and residual fatigue life analysis of cracked components under complex stress fields. Technical report 2

Technical Report · Tue Jul 01 00:00:00 EDT 1975

DOI:https://doi.org/10.2172/7307785· OSTI ID:7307785

Besuner, P. M.

The development and application of an influence function method for calculating stress intensity factors and residual fatigue life for two- and three-dimensional structures with complex stress fields and geometries are reviewed. Through elastic superposition, the method properly accounts for redistribution of stress as the crack grows through the structure. The analytical methods utilized and the computer programs necessary for computation and application of load independent influence functions (IE) are presented. A new exact solution is obtained for the buried elliptical crack, under an arbitrary Mode I stress field for stress intensity factors at four positions around the crack front. The IF method is then applied to two fracture mechanics problems with complex stress fields and geometries. These problems are of current interest to the electric power generating industry and include the fatigue analysis of a crack in a pipe weld under nominal and residual stresses and fatigue analysis of a reactor vessel nozzle corner crack under a complex bivariate stress field.

• Research Organization: Failure Analysis Associates, Palo Alto, CA (USA)
• OSTI ID: 7307785
• Report Number(s): EPRI-217-1
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
CALCULATION METHODS
COMPUTER CALCULATIONS
CONTAINERS
CRACKS
FAILURES
FATIGUE
FRACTURE PROPERTIES
FRACTURES
JOINTS
MECHANICAL PROPERTIES
MECHANICAL STRUCTURES
NOZZLES
PIPES
PRESSURE VESSELS
STRESS ANALYSIS
STRESSES
WELDED JOINTS