多晶体和粒状冰的高应变率行为:实验和数值研究

IF 3.8 2区 工程技术 Q1 ENGINEERING, CIVIL
Shruti Pandey, Ishan Sharma, Venkitanarayanan Parameswaran
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引用次数: 0

摘要

我们采用分体式霍普金森压力棒 (SHPB) 研究了两种不同类型冰(即多晶冰和粒状冰)在 -1° - 0 ° C 之间 100s-1 至 300s-1 应变速率范围内的应力-应变响应。通过在塑料模具中冷冻水制备的多晶冰样品在所考虑的应变速率范围内显示出 7 至 10 兆帕的抗压强度。峰值应力下的应变保持在 0.2% 以下,表明其为脆性行为。多晶体冰的应力-应变曲线显示出较长的尾部,表明受损的冰试样保留了一定的强度。测试期间的高速成像显示冰的破坏机制是碎裂和轴向劈裂。在商用有限元(FE)软件 ABAQUS 中实施了基于约翰逊-霍尔姆奎斯特 II(JH-2)模型的用户子程序,以预测冰在高应变速率下的响应,从而捕捉实验应力-应变曲线中存在的软化现象。JH-2 模型中的完整强度参数和应变速率敏感常数是根据我们的实验数据和文献结果确定的,确保与实验峰值应力一致。断裂强度和损伤演化参数是通过匹配模拟和实验的峰值后响应确定的。有限元模拟的时间损伤演变与实验的高速图像非常吻合,从而提供了额外的验证。将研究扩展到粒状冰,通过压碎多晶冰并重新冷冻制备样品。在名义应变速率为 200±50s-1 时,粒状冰的抗压强度为 4±0.7 兆帕。粒状冰是多晶冰和空隙的混合物,使用混合规则对其进行均质化处理,以获得弹性特性。利用我们确定的 JH-2 参数得出的有限元模拟结果与实验数据非常吻合,表明 JH-2 模型非常适合预测这两种冰的高应变速率行为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

High strain-rate behavior of polycrystalline and granular ice: An experimental and numerical study

High strain-rate behavior of polycrystalline and granular ice: An experimental and numerical study

We study the stress–strain response of two different types of ice, viz. polycrystalline ice and granular ice, between −1° – 0 °C over a strain-rate range of 100s1 to 300s1 employing the split Hopkinson pressure bar (SHPB). Polycrystalline ice samples, prepared by freezing water in plastic moulds, exhibit a compressive strength ranging from 7 to 10 MPa within the considered strain-rate range. The strain at peak stress remains below 0.2%, indicating brittle behavior. The stress-strain curve of polycrystalline ice displays a prolonged tail, suggesting that the damaged ice specimen retains some strength. High-speed imaging during tests reveals the damage mechanism in ice is fragmentation and axial splitting. A user subroutine based on the Johnson–Holmquist II (JH-2) model is implemented in the commercial finite element (FE) software ABAQUS to predict ice's response at high strain-rates, which captures the softening present in the experimental stress–strain curve. Intact strength parameters and strain-rate sensitivity constants in the JH-2 model are determined from our experimental data and literature results, ensuring alignment with experimental peak stress. Fractured strength and damage evolution parameters are determined by matching post-peak responses from simulations to experiments. Temporal damage evolution from FE simulations aligns well with high-speed images from experiments, providing additional validation. Extending the study to granular ice, samples are prepared by crushing polycrystalline ice and refreezing it. The compressive strength of granular ice at a nominal strain-rate of 200±50s1 is found to be 4±0.7 MPa. The granular ice, which is a mixture of polycrystalline ice and voids, is homogenized using rule-of-mixture to obtain the elastic properties. The FE simulation results utilizing the JH-2 parameters that we determine matches well with the experimental data, demonstrating that the JH-2 model is well suited to predict the high strain-rate behavior of both types of ice.

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来源期刊
Cold Regions Science and Technology
Cold Regions Science and Technology 工程技术-地球科学综合
CiteScore
7.40
自引率
12.20%
发文量
209
审稿时长
4.9 months
期刊介绍: Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.
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