Load-Point Compliance for the Arc Bend-Arc Support Fracture Toughness Specimen

摘要

The primary objective of this work is to provide the theoretical computation ofload-point compliance for the arc bend-arc support specimen and some experimental verification of these predictions. This specimen is a segment of an annular disk loaded in three-point bending with the roller supports positioned at the inside surface. Load-line compliance was determined principally by utilizing Irwin's Equation that relates the compliance rate of change with crack length to the strain energy release rate. The strain energy release rate was determined from the stress intensity solution available in the literature for this sample. Corroboration was also provided by utilizing boundary collocation (BC), boundary integral element (BIE), and finite element methods (FEM). Representative cases were experimentally tested to confirm theoretical and numerical results. During those tests, it was also found that duplication of idealized support and fixture conditions were extremely important with regard to accurate measurement of load-point compliance. Keywords: Fracture mechanics, ASTM standard E-399, Mechanics, Physics, Fracture testing, Thin-walled tubing, Arc-shaped, metals, Stress intensity factors, Numerical stress analysis, Compliance. (JG)