The present study deploys a continuum mechanics approach called peridynamics to investigate the damage behaviour of a 2D microstructure, which was taken from a plasma sprayed ceramic coating used in solid oxide fuel cell (SOFC) sealing systems. At the beginning, two benchmark cases, namely, plate with a hole as well as plate with a single edge notch, are considered. The results are compared to an analytical solution and a very good agreement is obtained. Based on these findings, a microstructural model from a plasma sprayed ceramic coating of SOFC sealing systems is investigated. These micromechanical simulations show that structural defects influence the crack initiation as well as the crack propagation during interconnecting the defects. Typical crack mechanisms, such as crack deflection, crack shielding or multiple cracking, are observed. Additionally, an anisotropy of the effective mechanical properties is observed in this heterogeneous material, which is well known for plasma sprayed materials.

中文翻译：

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使用近场动力学对等离子喷涂陶瓷涂层进行微观结构研究

本研究采用一种称为近场动力学的连续介质力学方法来研究二维微结构的损伤行为，二维微结构取自用于固体氧化物燃料电池 (SOFC) 密封系统的等离子喷涂陶瓷涂层。一开始，考虑了两种基准情况，即带孔的板和带单边缺口的板。将结果与解析解进行比较，获得了非常好的一致性。基于这些发现，研究了 SOFC 密封系统等离子喷涂陶瓷涂层的微观结构模型。这些微观力学模拟表明，结构缺陷会影响裂纹萌生以及缺陷互连过程中的裂纹扩展。观察到典型的裂纹机制，例如裂纹偏转、裂纹屏蔽或多重裂纹。