Modelling of deformation and fracture in high-temperature structural materials. Annual progress report, February 1, 1981-February 28, 1982

Technical Report · Mon Feb 01 04:00:00 EST 1982

OSTI ID:5436313

Miller, A K

The general objective of this project is to use Materials Science in developing models which can predict fracture of metals and alloys. Particular emphasis is placed on materials-limited aspects of energy technology which, in turn, leads to an emphasis on predicting fracture of high-temperature structural materials and fracture under complex histories and environments. Summaries of research progress are presented for: (1) modelling of fatigue crack initiation and growth; (2) modelling of strain softening; (3) modelling of multiaxial plastic flow; (4) development of a physical basis for calculating the MATMOD constants for alloys; and (5) subgrain and forest dislocation strengthening during isotropic hardening. Some of the highlights are: development of fatigue crack initiation and growth model; (FATIGMOD) which has the simulative and predictive capabilities to treat fatigue crack problems for smooth, small-flow, and large-flow conditions; application of FATIGMOD model to obtain constants for 707S-T6 aluminum alloy; MATMOD-4V equations are suitable starting basis for development of a general set of constitutive equations for multiaxial plasticity; data suggest that increasing the amount of Mg in Al can lead to increased strain rate sensitivity at high strain rates. (ATT)

• Research Organization: Stanford Univ., CA (USA). Dept. of Materials Science and Engineering
• DOE Contract Number: AT03-76ER70057
• OSTI ID: 5436313
• Report Number(s): SU-DMS-82-R-3; ON: DE82013040
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM
ALUMINIUM ALLOYS
CRACK PROPAGATION
DEFORMATION
ELEMENTS
FAILURES
FATIGUE
FORECASTING
FRACTURE PROPERTIES
FRACTURES
HARDENING
HIGH TEMPERATURE
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
METALS
RESEARCH PROGRAMS
STRAIN SOFTENING
STRESSES