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| 基于内聚力单元的聚合物矿物复合材料损伤失效行为有限元分析 |
| Finite element analysis of failure behavior of polymer-mineral composites based on cohesive element |
| 投稿时间：2024-11-25 修订日期：2024-12-26 |
| DOI： |
| 中文关键词: 聚合物矿物复合材料 细观结构 断裂行为 界面过渡区 有限元 |
| 英文关键词:Polymer-mineral composites mesoscopic structure failure behavior Interface Transition Zone Finite element method |
| 基金项目:基金(E2023203074)河北省自然科学基金委员会,青年项目；基金(52305512)国家自然科学基金委员会,青年项目. |
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| 中文摘要: |
| 聚合物矿物复合材料作为一种非均质颗粒增强复合材料，其细观结构和各组分性能都会对宏观性能产生影响。然而现有的细观结构模型忽略了非凸颗粒的存在，且多针对骨料不发生断裂的水泥基混凝土。本文建立了拟实的细观结构有限元模型，全局预插入内聚力单元，对聚合物矿物复合材料断裂行为进行了深入的研究。研究表明，当界面过渡区与基体抗拉强度之比σITZ/σm从0.125增加到0.5，复合材料的抗拉强度和损伤应变分别提高了70.82%和19.50%；当σITZ/σm从0.5增加到1.0，复合材料的抗拉强度提高了0.98%，损伤应变降低了7.99%。当界面过渡区与基体断裂能之比GITZ/Gm从0.125增加到0.25，复合材料的抗拉强度和损伤应变分别提高了12.61%和36.06%。当GITZ/Gm从0.25增加到1，复合材料的抗拉强度和损伤应变分别仅提高了1.04%和1.77%。 |
| 英文摘要: |
| As a heterogeneous particle-reinforced composite, the macroscopic properties of polymer-mineral composites are influenced by the mesoscopic structure and the component properties. However, the existing meso-structural models often ignore the non-convex particles, and primarily focus on cement-based concrete with no aggregate fracture. This paper investigated the fracture behavior by a realistic meso-structural finite element model with globally pre-inserted cohesive elements. The results showed that when the ratio of Interface Transition Zone (ITZ) tensile strength to matrix tensile strength (σITZ/σm) increased from 0.125 to 0.5, the composite's tensile strength and damage strain increased by 70.82% and 19.50%, respectively. When σITZ/σm increased from 0.5 to 1.0, the tensile strength only increased by 0.98%, while the damage strain decreased by 7.99%. When the ratio of ITZ fracture energy to matrix fracture energy (GITZ/Gm) increased from 0.125 to 0.25, the composite's tensile strength and damage strain increased by 12.61% and 36.06%, respectively. When GITZ/Gm increased from 0.25 to 1, the increases in tensile strength and damage strain were only 1.04% and 1.77%, respectively. |
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