|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fracture Properties and Residual Stresses in Small Dimensions
||In Situ Micron Scale Fracture Toughness Testing and Modeling of a Chevron Notched Bowtie-shaped Beam
||Fiona Yuwei Cui, Richard Vinci
|On-Site Speaker (Planned)
||Fiona Yuwei Cui
The chevron Single Edge Notched three point bending test has many advantages for measuring fracture toughness in bulk system. However employing this technique at the micron scale is challenging. In this study, we are developing a micron-scale bowtie-shaped specimen with a chevron notch to create stable crack growth. In-situ fracture testing was carried out using a Hysitron PI 85 Pico-indenter inside FEI Scios DualBeam FIB. A multi-step loading function was utilized to generate information about compliance change with respective to crack length in each loading cycle. A 3D finite element analysis model was built in Altair Hypermesh and ANSYS to evaluate the compliance change with crack length. Finally, a fracture toughness value was calculated by combining both experimental and analytical results. In order to verify the FEA model, a TEM specimen was fabricated at the notch area after early cycles in a fracture test to measure a real crack length.