作者：Dominic Gerber Lawrence A. Wilen Eric R. Dufresne Robert W. Style
冻湿多孔材料引起的损伤是一个普遍存在的问题，但很难预测或控制。在这里，我们表明，多晶性与支撑这种损伤的应力积聚过程有很大的不同。晶界槽中的未冷冻水在低于冷冻温度的温度下促进了冰的生长，导致局部应力的快速积聚。这个过程是非常可变的，我们将其归因于晶粒取向的局部差异，以及许多凹槽令人惊讶的移动性，这进一步加速了应力的积聚。我们的工作将有助于了解冻害是如何发生的，并有助于开发准确的模型和有效的图像缓解策略。
Damage caused by freezing wet, porous materials is a widespread problem, butis hard to predict or control. Here, we show that polycrystallinity makes agreat difference to the stress build-up process that underpins this damage.Unfrozen water in grain-boundary grooves feeds ice growth at temperatures belowthe freezing temperature, leading to the fast build-up of localized stresses.The process is very variable, which we ascribe to local differences inice-grain orientation, and to the surprising mobility of many grooves — whichfurther accelerates stress build-up. Our work will help understand how freezingdamage occurs, and in developing accurate models and effectivedamage-mitigation strategies.
论文链接：http://arxiv.org/pdf/2303.13428v1
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