Untersuchung des mehrachsigen elektro-mechanischen Materialverhalten von ferroelektrischen Keramiken

采用实验方法研究了铁电陶瓷固体的多轴机电本构行为。将分别对管状试件和平面试件进行拉扭和双向拉伸试验。多轴机械加载对电学行为的影响将通过应力-应变曲线、电场-电位移曲线以及最重要的机电“屈服面”来量化。这些多轴结果一旦可用，将为未来唯象本构定律的发展和进一步研究铁电固体对缺陷的敏感性奠定基础。

Multi-axial electromechanical constitutive behavior of ferroelectric ceramic solids will be investigated by the method of experiment. Tension-torsion and bi-axial tension tests will be performed on tubular and planar specimens, respectively. Effect of the multi-axial mechanical loading upon the electric behavior will be quantified, in terms of the stress-strain curves, the electric field-electric displacement curves and, most importantly, the electromechanical "yield surface". These multi-axial results, once available, are the basis for future development of phenomenological constitutive laws and for further study of the sensitivity of ferroelectric solids to flaws.