About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Fracture of Steels: New Approaches to Modeling and Experimental Characterization
|
| Presentation Title |
Is Fracture Toughness a Material Property? The Crack Size and Specimen Size Effects on Fracture Toughness of Steels and Other Materials |
| Author(s) |
K. S. Ravi Chandran |
| On-Site Speaker (Planned) |
K. S. Ravi Chandran |
| Abstract Scope |
Fracture toughness is a valuable property of high strength steels, often used in designing fracture critical components in energy, transportation and infrastructure applications. It has been thought of as a material property that is not affected by crack size and the specimen size. On the contrary, extensive experimental data on steels and other high strength materials show strong crack and specimen effects on fracture toughness. This poses a problem for the use of fracture toughness obtained using small specimens to large structures or components. In this work, a net-section based stress analysis is used to explain the size-dependence of fracture toughness of steels. The analysis enforces constancy of crack tip fracture stress, leading to the finding that fracture toughness should vary crack size and specimen width. Scaling laws have been developed to scale small specimen fracture toughness to large structures or components. |