Hu Cong, Li Taicheng, Fu Zhaoqing, Mao Haiying, Wang Siyao, Liang Zilin, Yu Shuyang
China Renewable Energy Engineering Institute, Beijing 100120, China.
School of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China.
Materials (Basel). 2024 Aug 30;17(17):4305. doi: 10.3390/ma17174305.
The existence of cracks is a key factor affecting the strength of concrete. However, traditional numerical methods still have some limitations in the simulation of crack growth in fissured concrete structures. Based on this background, the numerical treatment method of particle failure in smoothed particle hydrodynamics (SPH) is proposed, and the generation method for concrete meso-structures under the smoothed particle hydrodynamics (SPH) framework is developed. The concrete meso-models under different pre-existing micro-fissure inclinations and bridge angles (the inner tip line of the double pre-existing micro-fissure is defined as a bridge, and the angle between the bridge and the horizontal direction is defined as the bridge angle) were established, and numerical simulations of the crack propagation processes of concrete structures under tensile stress were carried out. The main findings were as follows: The concrete meso-structures and the pre-existing micro-fissures all have great impacts on the final failure modes of concrete. The stress-strain curve of the concrete model presents four typical stages. Finally, the crack initiation and propagation mechanisms of fissured concrete are discussed, and the application of smoothed particle hydrodynamics (SPH) in crack simulations of fissured concrete is prospected.
裂缝的存在是影响混凝土强度的关键因素。然而，传统数值方法在模拟裂隙混凝土结构中的裂缝扩展时仍存在一些局限性。基于此背景，提出了光滑粒子流体动力学（SPH）中粒子失效的数值处理方法，并开发了光滑粒子流体动力学（SPH）框架下混凝土细观结构的生成方法。建立了不同初始微裂隙倾角和桥接角（将两条初始微裂隙的内端连线定义为桥接，桥接与水平方向的夹角定义为桥接角）下的混凝土细观模型，并对混凝土结构在拉应力作用下的裂缝扩展过程进行了数值模拟。主要研究结果如下：混凝土细观结构和初始微裂隙对混凝土的最终破坏模式均有较大影响。混凝土模型的应力-应变曲线呈现四个典型阶段。最后，探讨了裂隙混凝土的裂缝起裂和扩展机制，并对光滑粒子流体动力学（SPH）在裂隙混凝土裂缝模拟中的应用进行了展望。
