Fracture Toughness Testing Using the C-Shaped Specimen
WATERVLIET ARSENAL NY
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The serious consequences of a fracture of a thick-walled cylinder containing a pressurized fluid are obvious. Any rational approach to such prevention requires the knowledge of the plane strain fracture toughness, KIc of the cylinder material. However, obtaining such knowledge can be more difficult than obtaining KIc from rectangular shaped bar and plate material. In order to partially overcome this limitation and also to reduce the expense of machining rectangular shaped specimens from a cylindrical geometry, the authors have developed a new specimen configuration known as the C-shaped specimen. Fracture toughness testing of material with cylindrical geometry is discussed, and the inherent advantages of the C-shaped specimen in this situation are given. A K calibration equation for the C-shaped specimen is presented which is based on boundary value collocation results. The C-shaped specimen K calibration is compared with those for the standard compact specimen and the single-edge- notched bar specimen.
- Metallurgy and Metallography
- Test Facilities, Equipment and Methods