Pletz Martin, Arbeiter Florian Josef
Designing Plastics and Composite Materials, Montanuniversitaet Leoben, 8700 Leoben, Austria.
Materials Science and Testing of Polymers, Montanuniversitaet Leoben, 8700 Leoben, Austria.
Materials (Basel). 2022 May 3;15(9):3273. doi: 10.3390/ma15093273.
The current publication deals with the fracture toughness of polymeric multi-layer materials. In detail, the crack initiation and growth, crack arrest, and crack re-initiation of a multi-layer material are examined. The aim is to develop a numerical model for crack initiation and incremental crack growth of a three-layer single edge notched bending specimen that features one brittle layer in a plastically deforming matrix. Crack initiation and crack propagation are modeled using the finite fracture mechanics concept and the energy concept, respectively. No delamination is accounted for and the crack grows in one plane. The experimental observation of a crack initiating in the brittle layer (at 61.4 ± 2.2 N) while the initial crack is blunting can be reproduced well with the numerical model (at 63.6 N) with a difference of <3.6%. The model is ready to be used for different layups to predict toughening mechanisms and damage tolerances in multi-layer materials.
当前的出版物涉及聚合物多层材料的断裂韧性。具体而言，研究了多层材料的裂纹萌生与扩展、裂纹止裂以及裂纹重新萌生。目的是开发一个数值模型，用于模拟具有塑性变形基体中包含一层脆性层的三层单边切口弯曲试样的裂纹萌生和增量裂纹扩展。分别使用有限断裂力学概念和能量概念对裂纹萌生和裂纹扩展进行建模。不考虑分层情况，裂纹在一个平面内扩展。数值模型（在63.6 N时）能够很好地再现实验观察结果，即初始裂纹钝化时在脆性层中萌生裂纹（在61.4±2.2 N时），两者差异<3.6%。该模型可用于不同的铺层，以预测多层材料中的增韧机制和损伤容限。
