Creep crack growth in ductile alloys

Conference · Sat Dec 31 23:00:00 EST 1983

OSTI ID:6189692

Argon, A S; Lau, C W; Ozmat, B; Parks, D M

Creep crack growth in ductile alloys involves considerable fragmentation of the crack tip region in its early phases of growth. This is a result of the defocusing action of crack tip blunting by both distortional and cavitational strains on the distribution of intergranular creep damage and is affected significantly by the initial sharpness of the crack. Specific models of intergranular damage combining non-steady creep flow, evolution and growth of grain boundary facet cracks in the inelastic deformation field leading to final fracture have been developed. When used in conjunction with finite element programs for crack tips, these damage models can explain such crack extension modes. The combination of mechanistic three dimensional damage models and large strain finite element codes, promise to be of wide-spread utility in predicting the development of creep damage under complex loading histories.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA)
• DOE Contract Number: AC02-77ER04461
• OSTI ID: 6189692
• Report Number(s): CONF-8404219-1; ON: DE85003937
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRACK PROPAGATION
CREEP
CRYSTAL STRUCTURE
DAMAGE
FINITE ELEMENT METHOD
GRAIN BOUNDARIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
NUMERICAL SOLUTION
STAINLESS STEEL-304
STAINLESS STEELS
STEELS