输油管道补板焊接修复结构有限元分析

补板修复是一种常用的输油管道焊接修复技术,焊接过程中不可避免的会产生残余应力,在应力水平较大处,管道易发生失效。基于有限元法,采用顺序耦合的方法和随温度变化的材料参数,运用有限元分析软件MSC.Marc,以管道穿孔后补板修复为例,分析了补板焊接修复过程应力、温度场的分布情况和随时间的变化规律。结果表明:冷却后补板和补板周围的残余应力最大,残余应力主要由焊接热循环引起,管道内压对残余应力的影响很小。

乏燃料水池水下局部干法焊接系统与设备研究

目前,国内核电站无论在建安阶段还是运维阶段,对不锈钢水池缺陷处理均采用干室环境下的焊接修复。营造干室环境需要耗费大量时间与人力,且在核电厂运行较长时间后更加难以实现。基于水下局部干法,研制出一套可实现水下运载+水下局部干法焊接的设备,通过补板法完成对乏燃料水池钢覆面缺陷的焊接修复,为核电厂乏燃料水池水下壁面缺陷维修提供技术基础。

Fracture analysis of cracked metallic plate repaired with adhesive bonding composite patch

Fatigue crack growth test of cracked metallic plate repaired with adhesive bonding composite patch was conducted to study the fracture behavior of crack patching. The failure mode was that crack grows along with adhesive debonding. The crack length and debonding area were measured at different numbers of cycles. The nonlinear three- dimensional(3D)finite element(FE)model considering adhesive debonding and crack growth simultaneously was developed. The experimental and analytical results were in good agreement with each other.