Dynamic mixed mode I/II fracture toughness and failure behaviour of freshwater ice under impact loading

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-11-19 DOI:10.1016/j.tafmec.2024.104769

Yiheng Zhang , Xiaobin Li , Wei Chen , Qing Wang , Duanfeng Han , Yu Hu

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引用次数: 0

Abstract

The dynamic mixed mode I/II fracture toughness of ice involves its fracture resistance under complex impact loading, which is essential for impact or blasting parameter selection and evaluation. The notched semi-circular bend (SCB) method was applied to determine the dynamic mixed mode I/II fracture toughness of freshwater ice based on a modified split Hopkinson pressure bar setup. The effects of loading rate and grain size on the mixed mode I/II fracture toughness of ice were comprehensively explored. A high-speed digital camera was adopted to record the crack propagation path and measure the crack propagation velocity. The experimental results indicate that the dynamic effective fracture toughness of SCB ice samples is dependent on the loading rate, particularly for mode I dominated loading. The dynamic fracture toughness decreases as the grain size increases from 0.8 to 4.5 mm. Subsequently, the fracture resistance was compared with the theoretical predictions based on some brittle fracture criteria. The generalized maximum tangential stress-based semi-analytical (SA-GMTS) criterion provides a good prediction for the dynamic mixed mode I/II fracture toughness of ice. For mixed mode I/II, the crack propagation velocities rise with the increase of loading rates. However, the grain size has little effect on the velocities. These results improve the understanding of the dynamic complex fracturing mechanism in ice engineering applications.

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冲击荷载下淡水冰的动态 I/II 混合模式断裂韧性和破坏行为

冰的动态混合模式 I/II 断裂韧性涉及其在复杂冲击载荷下的抗断裂性，对于冲击或爆破参数的选择和评估至关重要。基于改进的分体式霍普金森压力棒装置，采用缺口半圆弯曲（SCB）法测定了淡水冰的动态混合模式 I/II 断裂韧性。全面探讨了加载速率和粒度对冰的 I/II 混合模式断裂韧性的影响。采用高速数码相机记录裂纹扩展路径并测量裂纹扩展速度。实验结果表明，SCB 冰样品的动态有效断裂韧性与加载速率有关，尤其是以模式 I 为主导的加载。动态断裂韧性随着晶粒尺寸从 0.8 毫米增加到 4.5 毫米而降低。随后，根据一些脆性断裂标准，将断裂韧性与理论预测值进行了比较。基于广义最大切向应力的半解析准则（SA-GMTS）对冰的动态混合模式 I/II 断裂韧度进行了很好的预测。对于 I/II 混合模式，裂纹扩展速度随着加载速率的增加而增加。然而，晶粒大小对速度的影响很小。这些结果加深了人们对冰工程应用中动态复合断裂机制的理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.