作　　者： ; ; ; ;

机构地区： 中南大学材料科学与工程学院粉末冶金国家重点实验室

出　　处： 《材料科学与工程学报》 2003年第5期697-702,共6页

摘　　要： 针对一种侧面和一端的成分呈梯度变化的圆柱体电极模型进行了热应力缓和优化设计。模型材料成分是金属Cu和NiFe2 O4 尖晶石陶瓷。采用混合律定律确定材料组分 性质关系 ,利用ansys有限元分析软件计算了从 30 0K(零应力状态 )升温到 130 0K时模型表面的热应力 ,分析了层数n、成分指数p以及锥角θ对模型表面热应力分布的影响。结果表明 :层数n主要影响应力曲线的光滑程度 ,层数增加 ,曲线变得平滑 ;成分指数p是热应力缓和设计的关键 ,指数越小 ,应力越小 ;锥角θ的增加也可缓和热应力 。 A cylinder model in which the composition at the profile and one end is made graded is designed to relax the thermal stress. The composition of the model includes Cu and NiFe 2O 4. The material-property estimation is made using the rules of the mixture. The influence of layer number(n), composition index(p) and the angle(θ) in the distribution of the thermal stress at the surface at 1300k(working temperature)have been investigated using the finite-element software(assuming the state at 300k as zero-stress state). The results show that the layer number n influences the smooth of the stress curves mainly. The more n is, the smooher the curves become. The composition index p is the key factor for the stress relax. The decrease of p results in the decrease of thermal stress. The increase of the angle is beneficial to relax the thermal stress.

关 键 词： 表面热应力缓和设计 尖晶石陶瓷 铝电解 惰性电极 功能梯度材料

领　　域： [化学工程]