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The effect of interfacial strength on the mesoscopic damage characteristics of resin-mineral composite based on PFC3D

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Abstract

Resin-mineral composites have a complex mesoscopic structure, the interfacial transition zone (ITZ) as its weak zone has a great influence on the damage performance of the material. Although the partial numerical simulation can reveal the influencing mechanism of the interfacial properties on the damage evolution at the mesoscopic scale, the accuracy of current digital model is low and the defined interval of the ITZ thickness is unknown, which makes it difficult to effectively describe the damage behavior of the material. To address the above problems, this paper establishes a four-media discrete element model which containing coarse aggregate, resin mortar, ITZ, and porous, investigating the variation of mechanical properties of the material, the distribution pattern of microcracks and the energy dissipation mechanism. The results show that the damaged process can be divided into four stages by considering the variation rate of microcrack increment as the criteria, which contain elastic compression, crack initiation, crack expansion, and post-peak damage, also the peak stress together with the elastic modulus of the material linearly increase with the increase of the interfacial strength, the crack initiation stress and damage stress have a well fitted relationship with the interfacial strength. Then, the energy evolution of the damage process is monitored, which indicates that the separation point of the strain energy and boundary energy curves in the pre-peak stage is influenced by the interfacial strength, and the growth rate of friction energy and damping energy rapidly increases in the post-peak stage. In conclusion, the evolutionary mechanism of the microcracks during loading is analyzed, it is observed that the internal microcracks initially emerge in the ITZ, furtherly connecting with the microcracks of the resin mortar to form the X-shaped fracture surface. The results reveal that the interfacial strength has a greater influence on the damage mechanism of the material, which can provide the reference for the precise design of some structural parts.

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Acknowledgements

The authors acknowledge the financial support from the National Natural Science Foundation of China (51965037 and 51565030) and the Science and Technology Program of Gansu Province of China (23JRRH0005). The authors also acknowledge the reviewer’s work contributing to this article.

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Wuqiang Li, Youtang Li, Junbo Xin & Hua Huang

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  1. Wuqiang Li
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  2. Youtang Li
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  3. Junbo Xin
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  4. Hua Huang
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Contributions

Among the authors, WL conceived the idea of the study and revised the manuscript critically for important intellectual content, YL constructed the model and wrote the initial draft of the paper, JX analyzed the data, HH supervises and guides the study topics.

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Correspondence to Hua Huang.

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Li, W., Li, Y., Xin, J. et al. The effect of interfacial strength on the mesoscopic damage characteristics of resin-mineral composite based on PFC3D. Comp. Part. Mech. 11, 853–865 (2024). https://doi.org/10.1007/s40571-023-00657-z

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