About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
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Presentation Title |
A Rapid Testing Method for Evaluating Strain-path Sensitivity |
Author(s) |
Anastasia Vrettou, David M Collins |
On-Site Speaker (Planned) |
Anastasia Vrettou |
Abstract Scope |
Evaluating ductility from different strain-paths is typically limited by the number of specimens that can be feasibly tested by methods such as Nakajima testing. Evaluating only selected pre-strains, for example, poorly samples strain-space, which must inhibit the discovery of the most desirable deformation paths. This shortcoming is overcome with a bespoke Small Punch Testing (SPT) system equipped with Digital Image Correlation, where ~10mm diameter specimens (scaled Nakazima geometries) are rapidly tested. The method is showcased steel specimens, where the strain-path sensitivity is comprehensively described. The specimen geometry permits electron microscopy without further sample machining; interrupted SPTs tests were examined with EBSD to obtain texture and Geometrically Necessary Dislocation density for different macroscopic strains and strain-paths. Complementary characterisation shows that texture development and dislocation density & structure, with the latter exhibiting unambiguous differences between equivalent strains reached by dissimilar strain-paths. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, Shaping and Forming |