位移边界对2D-FGM板热应力影响研究  

Study of displacement boundary stress effects on the transient thermal stress of 2D-FGM plate

作　　者：许杨健[1] 刘文芝[1] 

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038

出　　处：《河北工程大学学报（自然科学版）》2015年第2期31-35,共5页Journal of Hebei University of Engineering:Natural Science Edition

摘　　要：考虑不同的位移边界条件,建立了常物性2D-FGM板研究模型,并采用有限元法,得到其冷却瞬态热应力场分布图形。位移边界条件对常物性2D-FGM平面区域冷却瞬态热应力分布影响颇大,在简支和一端固定情况下,2D-FGM板自由边界上的热应力σx=0;两端固定情况下,其左右两边界均形成上中下三个应力聚集,应力分布形状和数值都发生了巨大的变化;将四周均设置呈固定约束后,热应力数值增长幅度较两端固定情况时更为明显。此结果为该材料的设计、制备提供了准确的理论计算依据。Considering the different displacement boundary condition, the model of 2D- FGM plate with temperature independency of material properties was established, and the cooling transient ther- mal stress field distribution pictures were obtained with the finite element method. Effects on the tran- sient thermal tress of 2D - FGM plate with temperature independency of material properties of during cooling process that the displacement boundary condition made were influential enormously. The ther- mal stress crx of on the free boundary of the 2D - FGM plate under simple supported and under one end clamped is zero; The thermal stresses accumulation were formed on the middle and lower of the two left and right boundaries of the 2D - FGM plate under two ends clamped, at the same time the shape and values of the thermal stress changed tremendously ; To the 2D - FGM plate under clamped all around, the growth rate of the thermal stresses was more obvious than that of the 2D - FGM plate under two ends clamped. The results of this paper provide the foundations of theory calculation for the design and fabrication of the material.

关 键 词：功能梯度材料板 冷却 瞬态热应力 位移边界 有限元法 

分 类 号：TB34[一般工业技术—材料科学与工程]