论文标题
CNT复合材料的基于微力学的相位场断裂建模
Micromechanics-based phase field fracture modelling of CNT composites
论文作者
论文摘要
我们提出了一种基于微力学的新型相位场方法，用于建模基于碳纳米管（CNT）复合材料中的裂纹启动和传播。首先通过平均场均匀化方法估算纳米复合材料的本构机械和断裂特性。 CNT的不均匀分散是通过代表团聚CNT的等效包含物来解释的。提出了详细的参数分析，以评估主要的微力特性对基于CNT的复合材料的断裂行为的影响。所提出的方法的第二步将先前估计的本构特性纳入相位场断裂模型中，以模拟基于CNT的复合材料中的裂纹起始和生长。通过涉及模式I和混合模式断裂条件的三个范式案例研究证明了介绍的框架的建模能力。
We present a novel micromechanics-based phase field approach to model crack initiation and propagation in carbon nanotube (CNT) based composites. The constitutive mechanical and fracture properties of the nanocomposites are first estimated by a mean-field homogenisation approach. Inhomogeneous dispersion of CNTs is accounted for by means of equivalent inclusions representing agglomerated CNTs. Detailed parametric analyses are presented to assess the effect of the main micromechanical properties upon the fracture behaviour of CNT-based composites. The second step of the proposed approach incorporates the previously estimated constitutive properties into a phase field fracture model to simulate crack initiation and growth in CNT-based composites. The modelling capabilities of the framework presented is demonstrated through three paradigmatic case studies involving mode I and mixed mode fracture conditions.
