A Top-Down Characterization of NiTi Single-Crystal Inelastic Properties within Confidence Bounds through Bayesian Inference
A Top-Down Characterization of NiTi Single-Crystal Inelastic Properties within Confidence Bounds through Bayesian Inference
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DOI：
10.1007/s40830-021-00311-8
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发表时间：
2021-03
影响因子：
2.2
通讯作者：
P. Honarmandi;M. A. Hossain;R. Arróyave;T. Baxevanis
中科院分区：
文献类型：
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作者：
P. Honarmandi;M. A. Hossain;R. Arróyave;T. Baxevanis
NiTi单晶的非弹性变形响应涉及可逆相变和位错滑移，并且相间的变形不相容性增强了这种非弹性变形响应。相变-塑性耦合会导致性能下降，包括功输出减少和早期疲劳失效。此类材料的非弹性特性的表征对于材料评估/排名和稳健的性能预测至关重要。鉴于（耦合）变形机制的直接介观测量在许多情况下是不切实际的，因此主要采用有限宏观实验中自上而下的单晶特性表征。这里，采用贝叶斯推理和基于微力学的连续单晶模型来确定（i）置信区间内的材料属性值，允许将量化的不确定性传播到性能预测上，这可用于更有效的设计方法； (ii) 各种材料参数对变形响应的相对影响的排序，可以进一步转化为以所采用的材料模型为条件的各种变形机制的各自影响； (iii) 定量评估总体变形响应中各相之间变形不相容的重要性。
The inelastic deformation response of NiTi single crystals involves reversible phase transformation and dislocation slip, which is enhanced by the deformation incompatibility among the phases. The phase transformation–plasticity coupling results in decrease in performance, including reduced work output and early fatigue failure. The characterization of the inelastic properties in this material class is crucial for material assessment/ranking and robust performance predictions. Given that direct mesoscale measurements of (coupled) deformation mechanisms are in many cases impractical, top-down characterization of single-crystal properties from limited macroscopic experiments is mostly employed. Here, Bayesian inference and a micromechanics-based continuum single-crystal model are adopted for determining (i) material property values within confidence intervals that allow for a propagation of the quantified uncertainty onto performance predictions, which can be used toward a more efficient design methodology; (ii) ranking of the relative influence of the various material parameters on the deformation response that can further translate to the respective influence of the various deformation mechanisms conditional on the adopted material model; and (iii) a quantitative evaluation of the importance of the deformation incompatibility among the phases in the overall deformation response.