Fracture analysis of spatially graded piezoelectric-flexoelectric materials using XIGA

被引：0

作者：

Unnikrishnan, Gokul Krishna ^{[1
]}

Sharma, Saurav ^{[2
]}

Pathak, Himanshu ^{[1
]}

Chauhan, Vishal Singh ^{[1
]}

机构：

[1] Indian Inst Technol, Sch Mech & Mat Engn, Mandi 175075, Himachal Prades, India

[2] Bauhaus Univ Weimar, Inst Struct Mech, D-99423 Weimar, Germany

来源：

THEORETICAL AND APPLIED FRACTURE MECHANICS | 2024年 / 133卷

关键词：

Fracture; FGM; Flexoelectricity; J; -Integral; XIGA; FATIGUE-CRACK GROWTH; TOPOLOGY OPTIMIZATION; ISOGEOMETRIC ANALYSIS; ELECTRIC-FIELD; X-FEM; FABRICATION; INTEGRALS; STATIONARY; SIMULATION;

D O I：

10.1016/j.tafmec.2024.104585

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Dielectric Functionally Graded Materials (FGMs) exhibit superior flexoelectric properties. Gradual changes in material properties lead to large strain gradients and excellent flexoelectric responses. Cracks behave in a complex manner inside piezoelectric-flexoelectric FGMs subjected to electromechanical loading. An extended isogeometric analysis (XIGA)-based formulation is developed for flexoelectric FGMs with crack discontinuities. Ceramic-polymer FGMs of barium titanate (BTO) and polyvinylidene fluoride (PVDF) are selected for analysis since this material combination has shown better flexoelectric response solely due to gradation. A higher-order electromechanical J-integral is used to study the behavior of cracks. The fracture behavior of different crack geometries at various grading indices and levels of flexoelectricity is investigated. A crack interaction study is conducted with varying crack parameters. The length-scale effect on the energy release rate is also shown. A significant reduction in the energy release rate is observed in FGMs due to the flexoelectric effect.

引用

页数：18

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