A specialised finite element for simulating self-healing quasi-brittle materials

被引：12
作者：
Freeman B.L. [1 ]
Bonilla-Villalba P. [1 ]
Mihai I.C. [1 ]
Alnaas W.F. [2 ]
Jefferson A.D. [1 ]
机构：
[1] School of Engineering, Cardiff University, Cardiff
[2] Elmergib University, Alkhoms
来源：
Advanced Modeling and Simulation in Engineering Sciences | / 7卷 / 1期
基金：
英国工程与自然科学研究理事会;
关键词：
Embedded strong discontinuity; Finite element method; Quasi-brittle materials; Self-healing;
D O I：
10.1186/s40323-020-00171-4
中图分类号：
学科分类号：
摘要：
A new specialised finite element for simulating the cracking and healing behaviour of quasi-brittle materials is presented. The element employs a strong discontinuity approach to represent displacement jumps associated with cracks. A particular feature of the work is the introduction of healing into the element formulation. The healing variables are introduced at the element level, which ensures consistency with the internal degrees freedom that represent the crack; namely, the crack opening, crack sliding and rotation. In the present work, the element is combined with a new cohesive zone model to simulate damage-healing behaviour and implemented with a crack tracking algorithm. To demonstrate the performance of the new element and constitutive models, a convergence test and two validation examples are presented that consider the response of a vascular self-healing cementitious material system for three different specimens. The examples show that the model is able to accurately capture the cracking and healing behaviour of this type of self-healing material system with good accuracy. © 2020, The Author(s).
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