A crack-opening-dependent numerical model for self-healing cementitious materials
A crack-opening-dependent numerical model for self-healing cementitious materials
复制标题
DOI：
10.1016/j.ijsolstr.2022.111601
复制
发表时间：
2022-04-11
影响因子：
3.6
通讯作者：
Freeman, B. L.
中科院分区：
文献类型：
--
作者：
Jefferson, A. D.;Freeman, B. L.
提出了一种新的自愈胶凝材料损伤-愈合模型。该模型是根据离散韧带模型的结果制定的，并以相关实验研究的结果为指导。愈合是模拟使用的相互作用的固化前沿传播从对立的裂纹面在愈合剂体内。该方法考虑了裂纹张开位移（COD）及其速率对愈合响应的依赖性。将新的损伤-愈合黏结区模型应用于耦合有限元代码中嵌入强不连续的单元，模拟了愈合剂的传输和力学行为。利用不同COD和COD率的试验数据对模型进行了验证。验证结果表明，该耦合模型能够很好地反映一个自主自愈系统的力学和流动特性，适用于各种裂纹结构和载荷路径。
A new damage-healing model for self-healing cementitious materials is described. The model is formulated using results from a discrete ligament model and guided by the findings of a linked experimental study. Healing is simulated using the interaction of curing fronts propagating from opposing crack faces within a body of healing agent. This approach accounts for the dependency of the healing response on the crack opening displacement (COD) and its rate. The new damage-healing cohesive-zone model is applied to an element with an embedded strong-discontinuity within a coupled finite-element code, which simulates healing-agent transport and mechanical behaviour. The model is validated using data from tests with different CODs and COD rates. The validations show that the coupled model represents the mechanical and flow behaviour of an autonomic self-healing system with good accuracy for a range of cracking configurations and load paths.