K Results and Comparisons for a Proposed Standard C-Specimen
WATERVLIET ARSENAL NY
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Stress intensity factor data from a boundary value collocation method are used to determine the K calibration for a proposed standard C-shaped specimen for fracture toughness testing. The standard specimen can be readily used with hollow cylinders which have outer-to-inner diameter ratios between 1.2 and 3.0. The K calibration is described in a polynomial form similar to that used with the ASTM standard compact specimen but with an additional term dependent on diameter ratio. Stress intensity factor results from a standard C- specimen with shallow cracks are compared with an analysis based upon the elastic solution for a curved beam under remote bending. K results for mid- depth cracks in the standard C-specimen are compared with compact specimen results and with results from a recently proposed round specimen similar to the compact specimen. Some suggestions are given and anticipated problems are discussed related to testing with the proposed standard specimen.
- Metallurgy and Metallography
- Test Facilities, Equipment and Methods