用新的交互积分法分析异种压电材料的界面动态防渗裂纹

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2024-10-22 DOI:10.1016/j.compstruct.2024.118668

Shuai Zhu , Hongjun Yu , Zhiyong Wang

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引用次数: 0

摘要

动态强度因子（IFs）是评估压电复合材料在机电冲击载荷作用下界面裂纹失效风险的重要参数。本研究建立了一种新的动态交互积分（I-integral），用于计算位于不同非均质压电介质中界面裂纹的动态应力 IFs（SIFs）和电位移 IFs（EDIF）。通过适当选择辅助变量，非均质压电双材料的 I 积分域表达式无需考虑任何压电材料特性的导数项。此外，经过严格的理论推导，所得到的 I 积分对于积分域包含其他多个界面的复杂模型仍然有效，无论额外的材料是直线还是曲线。结合改进的扩展有限元法，通过检查从 I 积分中提取的动态 IF 与参考结果，确认了其准确性。通过改变非均质压电双材料和多界面压电复合材料的积分域范围，测试了域无关性。最后，利用典型实例讨论了电冲击载荷的方向和大小、极化组合、压电双材料的不均匀程度以及不同材料特性的复杂分布对动态 IF 的影响。

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Interfacial dynamic impermeable crack analysis in dissimilar piezoelectric materials by a new interaction integral

Dynamic intensity factors (IFs) provide an important parameter for assessing the failure risk of an interfacial crack for piezoelectric composites exposed to electromechanical impact loadings. In the present research, a new dynamic interaction integral (I-integral) is built for computing the dynamic stress IFs (SIFs) and electric displacement IF (EDIF) of an interfacial crack located in dissimilar inhomogeneous piezoelectric media. Through proper selection of auxiliary variables, the domain expression of I-integral for the inhomogeneous piezoelectric bi-materials does not need to take into account any derivative term for any piezoelectric material property. Further, after rigorous theoretical derivation, the resulting I-integral is still valid for complex models where the integration domain contains other multiple interfaces, regardless of whether the extra materials are straight or curved. Incorporating the modified extended finite element method, the accuracy is confirmed by checking the dynamic IFs extracted from the I-integral with referenced results. The domain-independence is tested by varying ranges of integration domains for inhomogeneous piezoelectric bi-materials and multi-interface piezoelectric composites. Finally, typical examples are employed to discuss the influences of the direction and magnitude of electric impact loading, combination of polarizations, inhomogeneous degree of piezoelectric bi-materials and complex distribution of diverse material properties on the dynamic IFs.

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.