About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fracture and Deformation Across Length Scales: Celebrating the Legacy of William Gerberich
|
| Presentation Title |
Recent Advances on the Size Effect on Fracture Toughness of Materials: The Role of crack tip stress in explaining crack size and specimen size effects |
| Author(s) |
K. S. Ravi Chandran |
| On-Site Speaker (Planned) |
K. S. Ravi Chandran |
| Abstract Scope |
Size effects on fracture toughness, including the crack size and specimen size effects, have not received a thorough examination in fracture mechanics, in part due to strict limits on crack and specimen sizes imposed by ASTM E399 standard. In this work, a net-section based stress analysis is used to explain the size-dependence of fracture toughness determined from fracture mechanics specimens. The analysis enforces constancy of crack tip fracture stress, leading to the finding that fracture toughness should vary crack size and specimen width. It is found that in most materials, fracture occurs at constant crack tip fracture stress that is nearly equal to the tensile strength. A few exceptional cases have also been noted, but fractures still occurred at constant crack tip fracture stress. Experimental fracture toughness data from ceramics, metals and biomaterials have been used to demonstrate the validity of the net-section approach in explaining the size effect. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Other, Other |