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Zhang Zhenke Fang Daining 《Acta Mechanica Solida Sinica》2003,16(1):41-46
Considering the influence of the domain switching near the tip of a crack and apply-ing the idea of multiscale singularity fields in piezoelectric fracture,we have obtained an empiricalcriterion for the crack closure.Based on the domain switching in the electric yield region,referringto Yang's results on the small scale yield model for the electrical fatigue crack,a model of thecrack closure during electric-field-induced fatigue is developed to analyze the crack growth.Interms of the model we have obtained the formula of the rate of the crack growth under cyclicelectric loading.Finally we compare the theoretical predictions with the results given by Cao andEvans experimentally.It should be pointed out that the model proposed is empirical and needsto be verified by more experimental results. 相似文献
33.
Based on micromechanics and Laplace transformation, a constitutive model of ferroelectric composites with a linear elastic
and linear dielectric matrix is developed and extended to the ferroelectric composites with a viscoelastic and dielectric
relaxation matrix. Thus, a constitutive model for ferroelectric composites with a viscoelastic and dielectric relaxation matrix
has been set up
Project supported by the National Natural Science Foundation of China (Grant No. 19891180). 相似文献
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IntroductionWiththedevelopmentofinformationindustryandtheapearanceofsmartmaterialsandsmartstructures,itbecomesmoreandmoreimpo... 相似文献
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铁电复合材料的力电耦合行为 总被引:4,自引:0,他引:4
对铁电复合材料力电耦合行为的研究进行综述.介绍了铁电复合材料的一些基本特点和线性压电有效性能的研究进展.阐述铁电复合材料中由于铁电相的铁电畴变与铁弹畴变以及基体相的弹性、粘弹性和介电弛豫性质所引起的铁电复合材料的非线性力电耦合行为.介绍了基于细观力学方法对铁电复合材料的本构关系进行研究的一些结果. 相似文献
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铁电材料以其力电耦合性能而在传感器、智能材料与结构等诸多领域获得广泛地应用.铁电材料的本构关系也因此成为研究热点.本文对铁电材料的本构关系以及与之相关的细观力学研究方法、宏观唯象研究方法、宏细观相结合的研究方法等问题的国内外研究进展作了一简要的评述. 相似文献
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Experimental analysis of ferroelectric composites with a viscoelastic and dielectric relaxation matrix is carried out, and
the electromechanical coupling behavior of the ferroelectric composites is calculated by means of the constitutive model proposed
in this paper. Comparisons between the experimental results and the calculations show that the constitutive model can reflect
the electromechanical coupling behavior of the ferroelectric composites. The analysis indicates that the effect of viscoelasticity
and dielectric relaxation of the matrix on the electromechanical coupling behavior of ferroelectric composites cannot be neglected. 相似文献
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铁电陶瓷PZT的实验本构研究 总被引:4,自引:1,他引:3
用低频高压电源和液压加力架实验研究了力电载荷下铁电陶瓷软性PZT(P-51)的单轴应力应变关系,在不同压应力下的电滞回线和蝶曲线,实验发现随着压应力的增加。PZT的铁电特性发生很大的变化,尝试用电畴来解释PZT在不同压力电性的变化规律和退极化效应,在本实验中,我们很好的解决了测试材料高压性能中常出现的绝缘问题和电弧放电问题,获得了比较系统的实验结果。 相似文献
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应用高灵敏度的力传感器以及时间序列电子散斑干涉法,同时测出了不同厚度纯镍薄片三点
弯曲试件的抗力与变形,得到薄梁中心点处的载荷与挠度曲线. 应用Fleck和Hutchinson
的偶应力理论,结合平面应变弯曲模型,建立了薄梁处于弹性状态和弹塑性状态的
控制方程, 应用Runge-Kutta法进行数值求解,并将计算得到的载荷-挠度曲线以及无量纲化弯矩-表面
应变曲线和实验结果进行了比较. 在理论计算过程中,没有拟合任何材料参数,所有的材料
参数均来自实验测量的结果,材料特征尺度也是根据Stolken和Evans的工作给出
的. 结果表明: 应用偶应力理论预测的结果和实验结果符合良好,而经典理论的预测结果与
实验不相符合. 相似文献
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Le Yang Na Li Likun Hu Shaoqi Wang Lin Wang Jiang Zhou Wei-Li Song Lei Sun Tai-Song Pan Hao-Sen Chen Daining Fang 《Acta Mechanica Sinica》2021,37(6):895-901
The safety of lithium-ion batteries is an essential concern where instant and accurate temperature sensing is critical.It is generally desired to put sensors in... 相似文献