Experimental characterization and constitutive modelling of the anisotropic dynamic compressive behavior of 3D printed engineered cementitious composites

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-03-08 DOI:10.1016/j.cemconcomp.2025.105995

Meng Chen , Jianhua Cheng , Tong Zhang , Yuting Wang

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引用次数: 0

Abstract

Engineered cementitious composites (ECC) offer a potential solution to the weak tensile strength and cracking issues of 3D printed concrete (3DPC), while their great performance under dynamic loading helps to broaden the application scope of 3D printing technology. This study systematically investigates the relationship between the dynamic compressive properties and the anisotropic behavior of 3DP-ECC under various strain rates through ultrasonic pulse velocity, quasi-static and dynamic compression, as well as novel sieving tests. The results indicate that the dynamic compressive behavior of 3DP-ECC shows a pronounced strain rate dependency especially in the Z-direction, while the mechanical anisotropy coefficient of the 3DP specimens decreased by 14.2% as the strain rate rose from 60 s⁻¹ to 120 s⁻¹. In what follows, the fractal theory is applied to characterize the internal damage of 3DP-ECC in different orientations, indicating that the dynamic compressive strength and dissipation energy exhibit a linear relationship with the fractal dimension. Based on the modified viscoelastic theory and spatial transformation tensor method, the anisotropic damage dynamic compression constitutive model is developed to predict the stress-strain behavior of 3DP-ECC at different strain rates. The exploration of dynamic compression behavior and anisotropic constitutive relationships of 3DP-ECC provides a basis for further integrated practical applications under extreme strain rate conditions.

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3D打印工程胶凝复合材料各向异性动态压缩行为的实验表征和本构建模

工程胶凝复合材料（ECC）为解决3D打印混凝土（3DPC）抗拉强度弱和开裂问题提供了潜在的解决方案，同时其在动载下的优异性能有助于拓宽3D打印技术的应用范围。本研究通过超声脉冲速度、准静态和动态压缩以及新型筛分试验，系统研究了不同应变速率下3d - p - ecc的动态压缩性能与各向异性行为之间的关系。结果表明：当应变速率从60 s−1增加到120 s−1时，3DP- ecc的动态压缩行为表现出明显的应变速率依赖关系，且力学各向异性系数降低了14.2%；本文应用分形理论对3d - p - ecc在不同方向上的内部损伤进行表征，发现其动态抗压强度和耗散能与分形维数呈线性关系。基于修正粘弹性理论和空间变换张量法，建立了三维立体ecc的各向异性损伤动态压缩本构模型，预测了其在不同应变速率下的应力-应变行为。对3d - p - ecc的动态压缩行为和各向异性本构关系的探索，为进一步在极端应变率条件下的综合实际应用提供了基础。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.