(Fundamentals of hardening and ecohesion behavior in time-dependent cyclic deformation). [Monocrystals and polycrystals of copper]

Technical Report · Tue Jan 01 00:00:00 EST 1991

OSTI ID:6365416

Bassani, J L

The research carried out in the current DOE grant of the proposers had two purposes: (a) to develop an analytical characterization of simple crystal hardening under multiple slip deformations and to extend the constitutive models and experimentation developed for monotonic deformation to problems of cyclic deformation and (b) to explain certain phenomena of monotonic and cyclic deformation which depend on latent hardening, e.g. texture development, cyclic strain bursts, the stage 1 -- stage 2 transition in fatigue crack propagation and the cyclic hardening behavior of polycrystals. In cyclic deformation, the main regime of interest was that of the plateau in the cyclic stress-strain curve of single crystals because long fatigue lines are associated with this regime. Progress is described in separate modelling and experimental segments in the next section (No. 2). Since it was realized that these results impinge strongly on the behavior of intercrystalline fracture, a proposal based on bicrystal experiments and analyses is then suggested. The proposed research is a study of the micromechanics of deformation and fracture processes at grain boundaries as affected by the structure of the boundary, slip geometry, hardening under multiple slip deformations, and the incompatibility of deformation at the boundary. A background and discussion of the study are offered in Sections (3) and (4) and the proposal proper in Section (5). 25 refs., 4 figs., 1 tab.

• Research Organization: Pennsylvania Univ., Philadelphia, PA (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: FG02-85ER45188
• OSTI ID: 6365416
• Report Number(s): DOE/ER/45188-T1; ON: DE91008043
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER
DEFORMATION
ANALYTICAL SOLUTION
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
DISLOCATIONS
FATIGUE
FCC LATTICES
FRACTURE PROPERTIES
GRAIN BOUNDARIES
MATHEMATICAL MODELS
MECHANICS
MONOCRYSTALS
PLASTICITY
POLYCRYSTALS
PROGRESS REPORT
RESEARCH PROGRAMS
STRAIN HARDENING
STRAINS
STRESSES
TEXTURE
TIME DEPENDENCE
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DOCUMENT TYPES
ELEMENTS
HARDENING
LINE DEFECTS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
TRANSITION ELEMENTS
360103* - Metals & Alloys- Mechanical Properties