The failure probability assessment model of piezoelectric materials under electric fatigue load

IF 1.3 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Ferroelectrics Letters Section Pub Date : 2022-11-02 DOI:10.1080/07315171.2022.2122414
Xianghua Chen, Qun Li, Chunguang Wang
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Abstract

Abstract The service life of piezoelectric devices is significantly affected by the electric fatigue load. The randomness of loads and nonuniformity of material properties caused by random distribution of internal defects in piezoelectric body will lead to the dispersion of the failure life of piezoelectric devices. Predicting failure probability of piezoelectric materials under electric fatigue load is essential for the reliability and life prediction of piezoelectric structures and devices. In this paper, the initial damage of piezoelectric materials is modeled as a random variable. Based on the methods of probability theory and statistics, the failure probability assessment model of piezoelectric materials under electric fatigue load is proposed. The probability density function of initial damage is obtained by observation and statistics of initial defect area. The failure probability assessment model of piezoelectric materials under electric fatigue load can be obtained by probability theory and integral method. Meanwhile, the failure probability evolution of piezoelectric materials under various electric fatigue loads is considered. The results show that the failure life and dispersion of piezoelectric materials is significantly affected by electric fatigue load, and the variation of failure probability under various electric loads is similar. Based on the proposed failure probability assessment models, the randomness of the electric load and randomly distributed initial defects of materials are considered in the damage evolution and performance prediction of piezoelectric structures, which is an important supplement to the reliability prediction and application of piezoelectric devices.
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压电材料在电疲劳载荷下的失效概率评估模型
电疲劳载荷对压电器件的使用寿命影响很大。压电体内部缺陷的随机分布所引起的载荷的随机性和材料性能的非均匀性将导致压电器件失效寿命的分散。预测压电材料在电疲劳载荷作用下的失效概率对压电结构和器件的可靠性和寿命预测至关重要。本文将压电材料的初始损伤建模为随机变量。基于概率论和统计学方法,提出了压电材料在电疲劳载荷作用下的失效概率评估模型。通过对初始缺陷面积的观察和统计,得到了初始损伤的概率密度函数。利用概率论和积分法建立了压电材料在电疲劳载荷作用下的失效概率评估模型。同时考虑了压电材料在不同电疲劳载荷作用下的失效概率演化。结果表明:电疲劳载荷对压电材料的失效寿命和分散性有显著影响,且不同电载荷下的失效概率变化相似;基于所提出的失效概率评估模型,在压电结构损伤演化和性能预测中考虑了电载荷的随机性和材料初始缺陷的随机分布,是压电器件可靠性预测和应用的重要补充。
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来源期刊
Ferroelectrics Letters Section
Ferroelectrics Letters Section 物理-物理:凝聚态物理
CiteScore
1.10
自引率
0.00%
发文量
1
审稿时长
4.8 months
期刊介绍: Ferroelectrics Letters is a separately published section of the international journal Ferroelectrics. Both sections publish theoretical, experimental and applied papers on ferroelectrics and related materials, including ferroelastics, ferroelectric ferromagnetics, electrooptics, piezoelectrics, pyroelectrics, nonlinear dielectrics, polymers and liquid crystals. Ferroelectrics Letters permits the rapid publication of important, quality, short original papers on the theory, synthesis, properties and applications of ferroelectrics and related materials.
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