J. Li
,
Q.S. Zhang
,
Y.Q. Lai
,
S.L. Ye
,
Y.X. Liu
金属学报(英文版)
The thermal stresses relaxation of Ni/NiFe2O4 system functionally graded cermet inert anode for aluminum electrolysis was optimally designed. The transient thermal stresses of the inert anode under complex boundary condition during high-temp (955℃) electrolysis were calculated using the finite-element software ANSYS, the influence of different parameters on the distribution of the thermal stresses were analyzed. The results showed that, during the process of thermal shock, the thermal hoop tensile stress on the surface of the anode is very large, which is possibly the major cause of anode crack; when the radius of the anode is between 0.05-0.15m, a range that can be realized by recent manufacturing technology, the optimum composition distribution exponent p is 0.25; The hoop tensile stresses reduce with the decrease of anode scale and also decrease with the decrease of the convection coefficient between the electrolyte and the anode.
关键词:
functionally graded material (FGM)
,
null
,
null
曹蕾蕾
,
裴建中
,
陈疆
,
张涛
材料导报
doi:10.11896/j.issn.1005-023X.2014.23.009
梯度功能材料的热应力问题贯穿梯度功能材料设计、制备、性能评价及应用整个研究领域,其中,热传导问题是热应力研究基础.介绍了梯度功能材料的概念及热传导和热应力问题的研究背景,重点分析了梯度功能材料热传导和热应力问题在数学模型、物性参数模型、解析方法、数值方法等方面的国内外研究进展,并展望进一步研究方向.
关键词:
功能梯度材料
,
热应力
,
热传导
,
解析方法
,
数值方法
李清禄
,
栾玮荻
,
李世荣
玻璃钢/复合材料
研究了由陶瓷和金属两种材料组成的功能梯度材料(FGM)圆板在非保守随从力作用下的稳定性问题.假设功能梯度材料性质只沿板厚度方向并按成分百分比的幂指数形式连续变化.推导了问题的控制微分方程,打靶法数值求解所得非线性边值问题,获得了两种边界下功能梯度圆板的变形与无量纲随从力之间的关系曲线.讨论了材料梯度指数以及两种边界条件对过屈曲和弯曲行为的影响.数值结果表明,两种边界条件下,各向同性均匀圆板都发生传统意义上的屈曲,而FGM圆板在随从载荷下,当梯度指标P＜0.1时发生屈曲,当P＞0.1时只发生弯曲.结果显示,材料的梯度性质和边界条件对弯曲和屈曲行为都有重要影响.
关键词:
功能梯度材料
,
圆板
,
随从力
,
稳定性
,
打靶法
