Abstract Direct comparisons between crystal plasticity simulations and experiments dedicated to test a sample containing a small number of grains (oligocrystal), instrumented using full field measurement techniques (DIC, grid method), have demonstrated their efficiency to reproduce the behavior of BCC and FCC metals at the grain scale. The extension of this approach to HCP metals, specifically for a grade 2 commercially pure titanium (CP-Ti) sample, is the objective of the present work. The influence of the critical resolved shear stress ratios on the numerical predictions of strain field and slip activity during uniaxial tension of the titanium oligocrystal was investigated. Simulation results were compared with their experimental counterparts, showing that a small variation of the critical resolved shear stress ratios identified by the authors in a previous study dedicated to grade 1 CP-Ti [Hama et al., Int. J. Plast., 91(2017), 77.] reproduced the experimental deformation behavior satisfactorily.

中文翻译：

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临界分辨剪切应力比对商业纯钛寡晶响应的影响：晶体塑性模拟和实验

摘要 晶体塑性模拟与专用于测试含有少量晶粒（寡晶）的样品的实验之间的直接比较，使用全场测量技术（DIC，网格方法）进行检测，证明了它们重现 BCC 和 FCC 金属行为的效率在谷物尺度上。将此方法扩展到 HCP 金属，特别是用于 2 级商业纯钛 (CP-Ti) 样品，是当前工作的目标。研究了临界分辨剪切应力比对钛寡晶单轴拉伸过程中应变场和滑移活动的数值预测的影响。模拟结果与他们的实验对应物进行了比较，表明作者在先前专门针对 1 级 CP-Ti 的研究中确定的临界分辨剪切应力比的微小变化 [Hama 等人，Int. J. Plast., 91(2017), 77.] 令人满意地再现了实验变形行为。