About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VII
|
Presentation Title |
Probing Fracture Toughness of Semi-brittle Materials on the Micronscale - Pitfalls and Recommendations |
Author(s) |
Michael Wurmshuber, Markus Alfreider, Stefan Wurster, Reinhard Pippan, Daniel Kiener, Mathias Göken |
On-Site Speaker (Planned) |
Michael Wurmshuber |
Abstract Scope |
Given the rapid advances in technology and microelectronics, materials are getting pushed towards minituarization while having to withstand extreme mechanical loads and provide safety against catastrophic failure. Fracture mechanical testing of micron-sized components will therefore play an important role in upcoming years. Especially more ductile and tough materials rarely fulfill experimental size requirements, even for elastic-plastic fracture mechanics (EPFM). In this work, we investigate the size dependency of (apparent) fracture toughness in ultrafine-grained tungsten, a semi-brittle material, and unravel the limits of size-independent EPFM experiments. This material is chosen given its excellent combination of strength and fracture toughness and its exciting application potential in nuclear fusion. Widely used microcantilever bending specimen are compared with double-edge notched microtensile specimen, to investigate possible effects of the bending gradient on measured toughness. The results are discussed thoroughly regarding potential pitfalls and recommendations for micron-sized fracture experiments and the accurate assessment of size-independent toughness. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, High-Temperature Materials, Mechanical Properties |