Examining the micromechanics of cementitious composites using In-Situ X-ray measurements
Examining the micromechanics of cementitious composites using In-Situ X-ray measurements
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DOI：
10.1016/j.ijsolstr.2023.112162
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发表时间：
2023-02
影响因子：
3.6
通讯作者：
R. Hurley;D. Pagan;E. Herbold;C. Zhai
中科院分区：
文献类型：
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作者：
R. Hurley;D. Pagan;E. Herbold;C. Zhai
Mori-Tanaka的近似和Herve-Zaoui的层状夹杂近似等微观力学理论已广泛用于预测各种复合材料的均质刚度、夹杂应力和基体应变。虽然这些理论准确地预测了均质性，但它们预测胶凝复合材料各个相的应力和应变的准确性尚未通过实验测量或用于推断相性质进行评估。因此，在这里，我们使用原位x射线断层扫描、3D x射线衍射和数字体积关联来评估两种胶凝复合材料的均质刚度、夹杂应力和基体应变。我们将测量结果与Mori-Tanaka的平均场近似和Herve-Zaoui的分层包含近似的预测结果进行比较。我们提供了一些第一手的直接支持，这些微观力学理论可以准确地预测均质样品刚度和单个相响应。我们还表明，将现场x射线测量与这些理论相结合，为推断特定相的性质提供了一种新的途径。
Micromechanics theories such as Mori–Tanaka’s approximation and Herve-Zaoui’s layered-inclusion approximation have been used extensively to predict homogenized stiffness, inclusion stresses, and matrix strains in various composites. While these theories accurately predict homogenized properties, the accuracy of their predictions of stresses and strains within individual phases of cementitious composites has not been assessed with experimental measurements or used to infer phase properties. Here, we therefore usein-situX-ray tomography, 3D X-ray diffraction, and digital volume correlation to evaluate homogenized stiffness, inclusion stresses, and matrix strains in two cementitious composites. We compare measurements with predictions of Mori–Tanaka’s mean-field approximation and Herve-Zaoui’s layered-inclusion approximation. We provide some of the first direct support that these micromechanics theories can accurately predict both homogenized sample stiffness and individual phase responses. We also show that combiningin-situX-ray measurements with these theories provides a novel route for inferring the properties of specific phases.