Plastic-strain, mean-stress criterion for ductile fracture

Journal Article · Sat Jul 01 00:00:00 EDT 1978 · J. Eng. Mater. Technol.; (United States)

DOI:https://doi.org/10.1115/1.3443491· OSTI ID:6559581

Norris, Jr, D M ^[1]; Reaugh, J E; Moran, B

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1. Lawrence Livermore Lab., CA

We describe a computer model for predicting ductile-fracture initiation and propagation. The model is based on plastic strain. Fracture starts or a crack extends when the integrated product of the equivalent plastic-strain increment and a function of the mean stress exceeds a critical value over a critical length. This critical length is characteristic of the microstructure of the material. The computer fracture model is calibrated by computer simulation of simple and notched round-bar tension tests and a precracked compact tension test. The model is then used to predict fracture initiation and propagation in the standard Charpy V-notch specimen. The computed results are compared with experiments. The model predicts fracture toughness from tests of standard surveillance specimens from nuclear-reactor pressure vessels and can be applied to fracture calculations for these vessels.

• OSTI ID: 6559581
• Journal Information: J. Eng. Mater. Technol.; (United States), Vol. 100:3
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
36 MATERIALS SCIENCE
POWER REACTORS
PRESSURE VESSELS
FRACTURE PROPERTIES
COMPUTER CODES
DUCTILITY
MATHEMATICAL MODELS
STEEL-ASTM-A533-B
STRAINS
ALLOYS
CARBON STEELS
CONTAINERS
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
REACTORS
STEELS
TENSILE PROPERTIES
220200* - Nuclear Reactor Technology- Components & Accessories
360103 - Metals & Alloys- Mechanical Properties