About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
New Frontiers in Physical Metallurgy of Steels
|
| Presentation Title |
Effect of specimen thickness and remaining ligament on the KIsi value in fracture toughness evaluation according to ASTM E399 |
| Author(s) |
Kideuk Min, Hyeong-Gyu Kim, Hyeon-Su Jang, Hak-Min Lee, Hyun-Sun Choi |
| On-Site Speaker (Planned) |
Kideuk Min |
| Abstract Scope |
Fracture toughness is critical in preventing crack-induced failures in aerospace and power plant components. ASTM E399 and ASTM E1820 are the primary standards for its evaluation, with ASTM E399 offering a simpler approach via the KIc method. However, valid KIc results require large specimen sizes, which is often unfeasible when using field components. To address this limitation, the ASTM E399 committee introduced the KIsi method, which is less sensitive to specimen size. Despite its advantages, the KIsi method has mostly been applied to select alloys, and its behavior in small specimens remains underexplored. This study investigates the influence of specimen thickness and remaining ligament (W–a) on KIsi values by testing specimens of various sizes. Results were compared with those from the KIc method to assess the validity and applicability of KIsi. The findings support the potential of KIsi for broader use in cases where standard size requirements cannot be met. |