BFEB包层氦冷屏的结构力学分析与优化  

MECHANICS ANALYSIS AND OPTIMISATION FOR HELIUM COOLING PANELS OF BFEB BLANKET

作　　者：朱毓坤[1] 黄锦华[1] 王晓宇[1] 

机构地区：[1]核工业西南物理研究院,四川成都610041

出　　处：《真空与低温》2004年第2期94-102,共9页Vacuum and Cryogenics

基　　金：国家自然科学基金资助(19885001)。

摘　　要：BFEB包层内部是用10MPa气氦冷却竖屏来分区并冷却的。作者根据材料力学和结构力学,通过Pro/MECHANICA编码计算,对在静态氦压与稳态温度场的组合作用下的氦冷屏基元管道模型,进行了结构力学(Mechanics)分析与优化。强度校核采用材料力学第四强度理论———八面体剪应力强度理论。氦冷屏基元管道的截面从矩形薄壁截面(12mm×9mm×1mm)优化为外方内圆薄壁截面(9mm×9mm×7mm或6mm)后,可使基元管道在静态氦压下的最大计算应力σpm和最大位移Dpm均可得到数量级的下降,从而使在静态氦压与稳态温度场组合作用下的最大计算应力σcm降低到小于HT 9许用应力[σT]。编码分析表明:氦冷屏基元管道的静态氦压计算应力σp为二向拉伸状态,而稳态温度场计算应力σt为二向压缩状态,它们的叠加组合具有一些相互抵消的效果。这导致外方内圆截面(9mm×9mm×7mm)的基元管道模型较(9mm×9mm×6mm)的具有更小的最大组合计算应力σcm。对于BFEB包层氦冷屏的拱形基元模型SC24＿7和回弯形基元模型SC44＿7,其最大组合计算应力σcm分别为95.60和134.00MPa,即HT 9[σT]的55.0%和77.0%;最大组合位移均约为2.8mm。所以,氦冷屏基元管道的截面形状和尺寸优化后,其稳态结构力学强度具有一定的安全裕度。The high power density blanket BFEB was split in zones and cooled with helium cooling panels. The mechanics analysis and optimisation for the basic element channel model of helium cooling panels under helium pressure and temperature field were carried out with the Pro/MECHANICA code. The strength check was carried out with the 4th strength theory-octahedral shear stress strength theory. The cross section of the basic element channel model of helium cooling panel was optimised from the rectangular with thin thickness one (12 mm×9 mm×1 mm) to square outer with circular inner one (9 mm×9 mm×7 mm or 6 mm). As a result, the maximum static Von Mises stress σ_(pm) and the maximum strain displacement D_(pm )of the basic element channel model both decreased in orders of magnitude. It let to that the maximum Von Mises stress σ_(cm) under the combine action of static helium pressure and steady temperature field decreased to be smaller than \,the allowable stress of HT-9 steel. Since the σ_(pm) was in two-dimensional tensile state, and the σ_(tm) was in two-dimensional compression state, the addition of them resulted in counteraction to some extent. Therefore, the basic element channel models with cross section of(9 mm×9 mm×7 mm) possessed a smaller σ_(cm) than that with (9 mm×9 mm×6 mm) one. The Von Mises stresses σ_(cm) of basic element channel models SC24_7(arched type) and SC44_7(meander loop type) of helium cooling panels were calculated to be 95.6 and 134.4 MPa,respectively, being 55.0 % and 77.0% of HT-9 allowable stress \.

关 键 词：结构力学分析 组合作用 薄壁截面 拱形 应力 计算 最大位移 稳态温度场 数量级 圆截面 

分 类 号：O342[理学—固体力学] TU311[理学—力学]