早期3D打印水泥基结构不稳定性研究——考虑界面影响

IF 5.3 2区 工程技术 Q1 MECHANICS
Renlong Liu , Jiyu Tang , Hu Feng , Zhanqi Cheng
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引用次数: 0

摘要

早期坍塌对三维打印混凝土(3DPC)工艺领域提出了重大挑战。同时,界面对3DPC的结构性能有着举足轻重的影响。然而,在早期的坍塌预测中,界面的影响很少被详细考虑。为了解决这一问题,通过引入等效界面的概念,提出了一种新的3D打印水泥基结构模型,该模型考虑了界面性能的影响。计算模型采用周动力学(PD)方法构建,结合特定键的参数修正来考虑界面效应。结果表明,与大多数类似研究中模拟的圆柱结构破坏高度夸大相比,等效界面模型有效减少了破坏层数,模拟结果更接近实验结果。此外,我们深入研究了不同程度的界面性能衰减对圆柱形结构破坏高度的影响,为潜在的机制提供了全面的见解。这些发现有助于解决3d打印过程中早期坍塌的紧迫问题,并为准确预测打印混凝土部件的破坏高度提供有价值的启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on the instability of early age 3D printing cement-based structure– considering the influence of interface
Early collapse poses a significant challenge in the realm of three-dimensional printing concrete (3DPC) processes. Concurrently, the interface assumes a pivotal role in influencing the structural performance of 3DPC. However, the influence of the interface is seldom considered in detail in early collapse predictions. To address this issue, a novel 3D printing cement-based structure model that incorporates the influence of interface performance is proposed by introducing the concept of an equivalent interface. The computational model was constructed using the peridynamics (PD) method, incorporating parameter corrections for specific bonds to account for interface effects. The results demonstrated that, compared with the exaggerated failure height of cylinder structures simulated in most similar studies, the model with equivalent interface effectively reduced the number of failure layers and the simulation results were closer to the experimental results. Furthermore, we conduct a thorough investigation into the impact of different degrees of interface performance attenuation on the failure height of cylindrical structures, offering comprehensive insights into the underlying mechanisms. These findings contribute to addressing the pressing issue of early collapse in 3DPC processes and offer valuable implications for accurately predicting the failure height of printed concrete components.
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来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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