Brittle to ductile transition in cleavage fracture

Technical Report · Wed Sep 30 00:00:00 EDT 1992

DOI:https://doi.org/10.2172/6976893· OSTI ID:6976893

Argon, A S; Berg, Q

The problem of interpretation of fracture transition from brittle to ductile or vice versa is the subject of study. An instrumented tapered double cantilever beam (TDCB) has been developed as a definitive tool in the study of the intrinsic mechanism in single crystalline samples. In this experiment, the crack velocity is directly proportional to actuator velocity. In experiments performed on TDCB shaped Si single crystals, oriented for cleavage on either [l brace]111[r brace] or [l brace]110[r brace] planes, a number of troubling features of jerky carck extension were encountered. Evidence suggests that nucleation of dislocation loops from crack tip is easier than moving these dislocations away from crack tip. 14 refs, 1 fig.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Mechanical Engineering
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-87ER45294
• OSTI ID: 6976893
• Report Number(s): DOE/ER/45294-T4; ON: DE93002466
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BRITTLE-DUCTILE TRANSITIONS
SILICON
CRACK PROPAGATION
CRACKS
DISLOCATIONS
FRACTURE MECHANICS
MEASURING METHODS
MONOCRYSTALS
NUCLEATION
ORIENTATION
PROGRESS REPORT
STRUCTURAL BEAMS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DOCUMENT TYPES
ELEMENTS
LINE DEFECTS
MECHANICS
SEMIMETALS
360603* - Materials- Properties