多晶性增强冰周围的应力累积
Polycrystallinity enhances stress build-up around ice
AI总结：
本研究针对潮湿多孔材料冻损难预测控制的问题，发现多晶性会通过晶界沟槽未冻水供冰生长、沟槽迁移等机制显著加速冰周局部应力累积，为冻损机制理解及防控策略开发提供支撑。
摘要：
潮湿多孔材料冻结引发的损伤是一个普遍存在的问题，但难以预测或控制。本文研究表明，多晶性对构成该损伤基础的应力累积过程有显著影响。在低于冰点的温度下，晶界沟槽中的未冻水会供给冰的生长，导致局部应力快速累积。这一过程存在很大的变异性，我们将其归因于冰晶粒取向的局部差异，以及许多沟槽出人意料的迁移性——这会进一步加速应力累积。本研究将有助于理解冻损的发生机制，并助力开发精准模型和有效的损伤缓解策略。
英文摘要：
Damage caused by freezing wet, porous materials is a widespread problem, but is hard to predict or control. Here, we show that polycrystallinity makes a great difference to the stress build-up process that underpins this damage. Unfrozen water in grain-boundary grooves feeds ice growth at temperatures below the freezing temperature, leading to the fast build-up of localized stresses. The process is very variable, which we ascribe to local differences in ice-grain orientation, and to the surprising mobility of many grooves -- which further accelerates stress build-up. Our work will help understand how freezing damage occurs, and in developing accurate models and effective damage-mitigation strategies.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
