Fracture of surface cracks loaded in bending

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:566585

Chao, Y J ^[1]; Reuter, W G ^[2]

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1. Univ. of South Carolina, Columbia, SC (United States). Dept. of Mechanical Engineering
2. Idaho National Engineering Lab., Idaho Falls, ID (United States)

Theoretical background of the constraint effect in brittle fracture of solids is reviewed. Fracture test data from D6-aC, a high strength steel, using three-point-bend (SE(B)) specimens and surface cracked plate (SC(B)) specimens under bending are presented. It is shown that the SE(B) data has an elevated fracture toughness for increasing a/W, i.e., a crack geometry with a larger T/K corresponds to a higher K{sub c} which is consistent with the theoretical prediction. The fundamental fracture properties, i.e., the critical strain and the critical distance, determined from the SE(B) test data are then applied to the interpretation and prediction of the SC(B) test data. Reasonable agreement is achieved for the crack growth initiation site and the load.

• Sponsoring Organization: USDOE, Washington, DC (United States); Department of the Air Force, Washington, DC (United States)
• OSTI ID: 566585
• Report Number(s): CONF-9606178--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRACK PROPAGATION
FRACTURE MECHANICS
FRACTURE PROPERTIES
MECHANICAL TESTS
STEELS