MULTI-FIELD COUPLING BEHAVIOR OF ELECTROMAGNETIC MATERIALS
The mechanical behavior of electromagneic materials is usually sensitive tothe electric,magnetic as well as temperature field.It is found by the experimentsin this paper that the grads of the non-uniform electric field can increase ordecrease the speed of the heat conduction in conductors,and the environmenttemperature and the varying-time excitation magnetic field have obviousinfluence on the strain of the giant magnetostrictive materials.Our theoreticalprediction on the induced body and boundary forces in ferromagnetic materialsand on the constitutive behavior of the giant magnetostrictive materials alsoexhibited a strong effect of multi-field coupling,which makes the mechanicalresponses of electromagnetic materials are very different from the uncouplingones.Furthermore,our theoretical investigations show that the effect of themulti-field coupling is not only in macroscales but also in microscales.For theelastic properties of nanowires,it is found in this paper that the negativepressure on the surfaces stemmed from the transverse electric field modifies theYoungs modulus and Poissons ratio of nanowires significantly.The relativechange of elastic properties is also strongly dependent on the diameter ofnanowires.
Multi-field Coupling Electromagnetic Materials Mechanical Behavior
Xiaojing Zheng
Department of Mechanics and Engineering Science,Lanzhou University,Lanzhou,Gansu,730000,P.R.China
国际会议
第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)
安徽黄山
英文
638-648
2008-06-03（万方平台首次上网日期，不代表论文的发表时间）