Dynamic mechanical behaviors and cracking mechanisms of non-straight flaws in tuff

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences Pub Date : 2025-04-23 DOI:10.1016/j.ijmecsci.2025.110303

Gang Sun , Junxiang Wang , Jieru Tian , Ruibin Han , Jinlu Ba , Hao Wang , Haiyue Yu

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Abstract

The cracking mechanisms in rock containing non-straight flaws under dynamic loading remain poorly understood. To study the effect of flaw inclination on the mechanical properties and cracking mechanism in tuff with non-straight flaws under dynamic load, a dynamic compression test was carried out using a large-diameter split Hopkinson pressure bar device. Based on the uni-bond dual-parameter peridynamics model, a rate-dependent rock dynamic damage model was constructed. The paired-particle algorithm was combined with OpenMP parallelization to establish an efficient method for simulating the dynamic failure of flawed rock. The method was used to investigate the 3D crack propagation process and cracking mechanism in tuff specimens with non-straight flaws. The results show that with the increase in the flaw inclination angle, the dynamic strength, crack initiation stress, and the ratio of crack initiation stress to peak stress gradually decrease, and the failure mode of the specimen changes from shear failure to tensile-shear failure and then to conjugate shear failure. Cracks in rock specimens with non-straight flaws will not only initiate from the tip of a pre-existing flaw, but also from the convex point of the pre-existing flaw. The maximum crack propagation speed observed is 762∼1040 m/s, which is 0.35∼0.48 times the Rayleigh wave velocity. The displacement trend lines on both sides of the crack surface and the calculated normal and tangential displacement components enable discerning five cracking mechanisms. The research results reveal the cracking mechanisms in flawed rock masses and provide a theoretical basis for underground engineering projects.

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凝灰岩非直裂纹的动态力学行为及开裂机理

含非直裂纹岩石在动载荷作用下的开裂机理尚不清楚。为研究动载作用下裂纹倾角对含非直裂纹凝灰岩力学性能的影响及开裂机理，采用大直径劈裂式霍普金森压杆装置进行了动态压缩试验。基于单键双参数周动力学模型，建立了随速率变化的岩石动态损伤模型。将配对粒子算法与OpenMP并行化相结合，建立了一种模拟裂隙岩石动态破坏的有效方法。采用该方法研究了含非直线型缺陷凝灰岩试件的三维裂纹扩展过程及开裂机理。结果表明：随着裂纹倾角的增大，试样的动强度、起裂应力、起裂应力与峰值应力之比逐渐减小，破坏模式由剪切破坏→拉剪破坏→共轭剪切破坏；具有非直裂纹的岩石试样的裂纹不仅从已存在裂纹的尖端开始，而且从已存在裂纹的凸点开始。观察到的最大裂纹扩展速度为762 ~ 1040 m/s，是瑞利波速的0.35 ~ 0.48倍。裂缝两侧的位移趋势线和计算的法向和切向位移分量可以区分五种开裂机制。研究结果揭示了裂隙岩体的开裂机理，为地下工程提供了理论依据。

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来源期刊

International Journal of Mechanical Sciences 工程技术-工程：机械

CiteScore

12.80

自引率

17.80%

发文量

769

审稿时长

19 days

期刊介绍： The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering. The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture). Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content. In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.