期刊
MATERIALS & DESIGN
卷 166, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2019.107604
关键词
Behavior by design; Additive manufacturing; Architectured materials; Strain hardening; X-ray tomography
资金
- Investments for the Future program [AN-10-LABX-44-01]
A design strategy, referred to as behavior by design, was introduced to develop novel architectured materials starting from their expected stress-strain response. Target behaviors in this strategy have unusual shapes that provide new functions to the material. Here, a numerical toolbox was employed to predict the geometry of metal tensile samples with a corrugated gauge section, given the expected characteristics of their stress-strain response. A multiscale approach, based on a finite element model, was used to construct characteristic points and indices on the macroscopic stress-strain curves to select the relevant input geometrical parameters. Additive manufacturing (electron beam melting) was employed to build several predicted geometries in Ti-6Al-4V titanium alloy. Mechanical testing revealed a good agreement between the experimental and predicted behaviors with limited difference in strain (0.8%) and stress (50MPa). Shape variations such as local thickness fluctuations were identified using X-ray tomography as a source of mismatch between simulations and experiments. The ability to control the whole shape of unusual stress-strain curves is expected to bring new exciting functionalities to architectured materials. (C) 2019 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license
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