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首页> 外文期刊>Journal of thermal stresses >THERMAL EFFECTS OF FERROELECTRIC/MAGNETIC MATERIALS UNDER CYCLIC-ELECTRIC LOADING
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THERMAL EFFECTS OF FERROELECTRIC/MAGNETIC MATERIALS UNDER CYCLIC-ELECTRIC LOADING

机译：循环电载荷下铁电/磁性材料的热效应

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摘要

The temperature in the ferroelectric and ferromagnetic materials may rise due to energy dissipation under loading. Thermal effects on the mechanical behavior in ferroelectric/ferromagnetic materials are investigated theoretically in this paper. First, the influence of stresses induced hy domain switching on the subsequent domain switching and domain reversal process in ferroelectrics is investigated. Based on the electrical saturation model, the influence of thermal effect on the domain switching is studied, and the changes of stress and electric intensity factors brought hy thermal effect are obtained. The accumulative influence of temperature rise on the domain switching zone and fracture behavior of ferroelectrics under cycle electric field is studied. Second, the above approach of ferroelectric materials is extended to analyze the thermal effect in ferromagnetic materials. Using the magnetic saturation model, the temperature fields around the tip of a narrow elliptic hole are calculated under different conditions. It is found that the magnitude of temperature increment strongly depends upon the geometrical shape of the hole, the frequency and wave shape of the magnetic loading. This study is helpful to gain a deep understanding of the fracture and fatigue behavior of ferroelectric/ferromagnetic materials.
机译：铁电和铁磁材料中的温度可能会由于负载下的能量耗散而升高。本文从理论上研究了热对铁电/铁磁材料力学性能的影响。首先，研究了应力诱导的氢畴转换对铁电体中随后的畴转换和畴反转过程的影响。基于电饱和模型，研究了热效应对域切换的影响，并获得了由热效应带来的应力和电强度因子的变化。研究了温度升高对循环电场下铁电介质的畴转换区和断裂行为的累积影响。其次，将上述铁电材料方法扩展到分析铁磁材料中的热效应。使用磁饱和模型，可以计算出在不同条件下狭窄椭圆孔尖端周围的温度场。发现温度增量的大小在很大程度上取决于孔的几何形状，磁性负载的频率和波形。这项研究有助于深入了解铁电/铁磁材料的断裂和疲劳行为。

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