Dynamic mode I fracture behavior of frozen soil under impact loading and FDEM numerical simulation: Based on a rate-dependent elastoplastic and cohesive model

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-09-29 DOI:10.1016/j.tafmec.2025.105261

Taiyu Zhang , Zhiwu Zhu , Fulai Zhang

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引用次数: 0

Abstract

The dynamic fracture behavior of frozen soil under impact loading is critical for ensuring the structural stability and service safety of infrastructure in cold regions exposed to extreme loading conditions. In this study, impact experiments were conducted on cracked straight-through flat Brazilian disk specimens under varying temperatures (−5, −15, and − 25 °C) and strain rates (100–250 s⁻¹). The crack propagation behavior, mode I dynamic fracture toughness, energy dissipation mechanisms, and responses to temperature and strain rate were systematically investigated. The results indicated that the mode I dynamic fracture toughness of frozen soil increased approximately linearly with strain rate. Low temperatures increased strain rate sensitivity. At high strain rates, the extent of specimen failure and fracture energy increased significantly. Furthermore, a finite–discrete element model incorporating rate-dependent elastoplastic behavior and a cohesive failure criterion was developed to investigate the dynamic fracture behavior of frozen soil. The spatial distribution of the cracks and evolution of the fracture modes at different strain rates were quantitatively analyzed. Simulation results demonstrated that as the strain rate increased from 100 to 250 s⁻¹, the total number of cracks increased exponentially. Shear cracks increased from 7 % to 23 %, whereas tensile cracks decreased from 93 % to 77 %. The initial inclination angle of the central crack significantly affected the fracture modes and propagation paths of the cracks. The numerical simulation results closely matched the experimental observations of crack propagation paths, failure modes, and fracture toughness evolution, indicating that the proposed numerical model effectively captures the dynamic fracture behavior of frozen soil.

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冲击荷载作用下冻土动态ⅰ型断裂行为及FDEM数值模拟：基于速率相关弹塑性和内聚模型

冻土在冲击荷载作用下的动态断裂行为对于保证严寒地区极端荷载条件下基础设施的结构稳定和使用安全至关重要。在本研究中，在不同温度（- 5，- 15和- 25℃）和应变速率（100-250 s - 1）下，对开裂的直通式扁平巴西圆盘试样进行了冲击实验。系统地研究了裂纹扩展行为、I型动态断裂韧性、能量耗散机制以及对温度和应变速率的响应。结果表明：冻土I型动态断裂韧性随应变速率近似线性增加；低温增加了应变率敏感性。在高应变速率下，试样的破坏程度和断裂能显著增加。在此基础上，建立了结合速率相关弹塑性行为和内聚破坏准则的有限离散单元模型来研究冻土的动力断裂行为。定量分析了不同应变速率下裂纹的空间分布和断裂模式的演化规律。模拟结果表明，当应变速率从100 s−1增加到250 s−1时，裂纹总数呈指数增长。剪切裂纹从7%增加到23%，而拉伸裂纹从93%下降到77%。中心裂纹的初始倾角对裂纹的断裂模式和扩展路径有显著影响。数值模拟结果与实验观测的裂纹扩展路径、破坏模式和断裂韧性演化结果吻合较好，表明所建立的数值模型有效地捕捉了冻土的动态断裂行为。

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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.