Computer model for ductile fracture: applications to the Charpy V-notch test. Phase one report

Technical Report · Mon Jan 01 00:00:00 EST 1979

DOI:https://doi.org/10.2172/6518272· OSTI ID:6518272

Norris, Jr., D. M.; Reaugh, J. E.; Moran, B.; Quinones, D. F.

A computer model for predicting ductile-fracture initiation and propagation in nuclear reactor pressure vessel steel is described. The model predicts fracture toughness from Charpy and tension tests using standard surveillance specimens. The fracture 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 of A533 Grade B Class 1 steel and two different heat treatments of this steel. The model is then used to predict fracture initiation and flat propagation in the standard Charpy V-notch specimen. The computed results are compared with experiments. A correlation is presented between the energy in the Charpy V-notch specimen at fracture initiation on the upper shelf and fracture toughness as measured by J/sub Ic/.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6518272
• Report Number(s): EPRI-NP-961; TRN: 79-005327
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
22 GENERAL STUDIES OF NUCLEAR REACTORS
PRESSURE VESSELS
FRACTURE PROPERTIES
STEEL-ASTM-A533
STEELS
CHARPY TEST
COMPUTER CALCULATIONS
MATHEMATICAL MODELS
STRESS ANALYSIS
ALLOYS
CONTAINERS
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
360103* - Metals & Alloys- Mechanical Properties
220200 - Nuclear Reactor Technology- Components & Accessories