Size and Deformation Limits to Maintain Constraint in KiC and Jc Testing of Bend Specimens, February 1994

摘要

The ASTM Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials (E399-90) restricts test specimen dimensions to insure the measurement of highly constrained fracture toughness values (Kic). These requirements insure small-scale yielding (SSY) conditions at fracture, and thereby tha validity of linear elastic fracture mechanics. This investigation compares the proposed size requirement with that of ASTM Standard Test Method E399 and, by comparison with published experimental data for various alloys, provides validation of the new requirements.