Direct detection of plasticity onset through total-strain profile evolution

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Physical Review Materials, Volume 5, issue 8
Plasticity in solids is dependent on microstructural history, temperature, and loading rate, and sample-dependent knowledge of yield points in structural materials adds reliability to mechanical behavior. Yielding is commonly measured through controlled mechanical testing, in ways that either distinguish elastic (stress) from total deformation measurements or identify plastic slip contributions. In this paper, we show that yielding can be unraveled through statistical analysis of total-strain fluctuations during the evolution sequence of profiles, measured in situ, through digital image correlation. We demonstrate two distinct ways of quantifying yield locations in widely applicable crystal plasticity models for polycrystalline solids, using either principal component analysis or discrete wavelet transforms. We test and compare these approaches for synthetic data of polycrystals and a variety of yielding responses through changes in applied loading rates and strain-rate sensitivity exponents.
| openaire: EC/H2020/857470/EU//NOMATEN Funding Information: We acknowledge support from the European Union Horizon 2020 research and innovation program under Grant Agreement No. 857470 and from the European Regional Development Fund via Foundation for Polish Science International Research Agenda PLUS program Grant No. MAB PLUS/2018/8. M.J.A. would like to acknowledge support from the Academy of Finland via Grant No. 317464. We acknowledge the computational resources provided by the National Centre for Nuclear Research in Poland. The data that support the findings of this study, together with python analysis scripts, are available from S.P. upon reasonable request. Publisher Copyright: © 2021 American Physical Society.
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Papanikolaou , S & Alava , M J 2021 , ' Direct detection of plasticity onset through total-strain profile evolution ' , Physical Review Materials , vol. 5 , no. 8 , 083602 .