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首页> 外文期刊>The international journal of pavement engineering >Review of modelling crack initiation and propagation in flexible pavements using the finite element method
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Review of modelling crack initiation and propagation in flexible pavements using the finite element method

机译：有限元方法在柔性路面裂纹萌生与扩展建模研究中的应用

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摘要

Cracking is a major failure mechanism that directly affects the functionality and performance of flexible pavements. The objective of this study is to present the state of knowledge on the use of finite element method (FEM) including cohesive zone model (CZM) to simulate cracking failure mechanisms in flexible pavements under field conditions. Based on this review, a knowledge base is established on how FEM can be effectively applied to predict pavement performance against cracking failure mechanisms. Two main approaches are presented in this study. In the first approach, focused finite element (FE) meshes are used to simulate the crack initiation and propagation phases. Focused meshes allow for estimating the J-integral and the stress intensity factor (SIF) through different contour lines. Since the SIF is a measure of the stress and strain environment around the crack tip (a greater SIF indicates a faster rate of propagation), the rate of crack propagation per cycle can be estimated based on empirical equations such as Paris' Law. In the second approach, the propagation of damage is simulated using FE and CZM. This approach allows one to study the loading mechanisms responsible for progressing cracking damage in the pavement structure. In summary, both approaches have merits in modelling cracking in flexible pavements. While focused meshes may be used to predict the number of cycles for crack propagation, CZM may be used to study the controlling stresses and mechanisms responsible for crack propagation.
机译：开裂是一种主要的破坏机制，直接影响柔性路面的功能和性能。这项研究的目的是介绍有关使用有限元方法（FEM）包括粘合区模型（CZM）来模拟现场条件下柔性路面开裂破坏机理的知识状态。在此基础上，建立了有关如何有效地应用FEM来预测路面抗开裂破坏机理的知识库。这项研究提出了两种主要方法。在第一种方法中，使用聚焦有限元（FE）网格来模拟裂纹萌生和扩展阶段。聚焦网格可以通过不同的轮廓线估计J积分和应力强度因子（SIF）。由于SIF是对裂纹尖端周围应力和应变环境的一种度量（更大的SIF表示更快的传播速率），因此可以基于经验公式（例如巴黎定律）来估算每个周期的裂纹传播速率。在第二种方法中，使用FE和CZM模拟损伤的传播。这种方法使人们可以研究造成路面结构开裂损坏的加载机理。综上所述，两种方法在建模柔性路面裂缝方面均具有优势。尽管聚焦网格可用于预测裂纹扩展的循环次数，但CZM可用于研究控制应力和裂纹扩展的机理。

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