金属铀元件整体弹塑性蠕变分析

• 作 者: 张忠岳 张重珠
• 机 构: 中国科学院原子能研究所,西南反应堆工程研究设计院,
• 出 处: 核科学与工程
• 发表日期: 1984年02期
• 关键词: 元件 金属 芯体 裂纹位置 周缘 蠕变 体轴 端盖 破损率 抗疲劳性

一、前言金属铀元件在辐照过程中因织构效应而出现芯体轴向伸长、径向变细、端面凸起的现象,常称为“正G3效应”;若芯体缩短、变粗、端面凹陷,则称为“负G3效应”。具有负G3效应的金属铀元件破损率较高,破坏经常发生在上、下端盖的中心或端盖周缘区域,并且端盖裂纹位置与芯体裂纹位置重合。这里主要讨论两个问题:(1)为什么端部区域易于破坏;(2)负G3效应是否对芯

I. Introduction Metal uranium components in the irradiation process due to the texture effect of the core axial elongation, radial thinning, the phenomenon of face raised, often referred to as “positive G3 effect”; if the core shortened, variable Coarse, face depression, then called “negative G3 effect.” Metallic uranium with a negative G3 effect has a high damage rate. Damage often occurs in the center of the upper and lower end caps or in the peripheral area of ​​the end cap, and the location of the crack in the end cap coincides with the position of the core crack. Here are two major issues to discuss: (1) Why the end area is prone to damage; (2) Is negative G3 effect on the core