引水钢岔管水压试验分布式应力测量
Distributed stress measurement for water pressure test of diversion steel branch pipe
尹国路 1马璟铭 2姜胜先 3王鑫 2张元寅 2朱涛4
作者信息
- 1. 重庆大学 煤矿灾害动力学与控制国家重点实验室,重庆 400044;重庆大学 光电技术及系统教育部重点实验室,重庆 400044
- 2. 重庆大学 光电技术及系统教育部重点实验室,重庆 400044
- 3. 长江科学院 重庆分院,重庆 400026
- 4. 重庆大学 光电技术及系统教育部重点实验室,重庆 400044;重庆大学 煤矿灾害动力学与控制国家重点实验室,重庆 400044
- 折叠
摘要
引水钢岔管的结构尺寸大、焊接工况复杂,且需要长期耐受6 MPa的水压,迫切需要一种分布式、高精度、高空间分辨率的应力测量技术,以便在水压试验中进行全方位的应力测量和结构健康评估.传统的点式应变片只能进行局部应力测量,且测量精度受制于防水措施、贴片工艺、温度变化等因素.为此,提出了一种基于光频域反射仪的引水钢岔管水压试验应力测量方法,采用沿焊缝布设的标准单模光纤作为传感器,测量空间分辨率达到5.8 cm,应力与水压力成线性关系并且沿焊缝存在0.2～0.6 m的周期性变化.月牙肋板焊缝的腰部应力最大,达到196.2 MPa;主锥环缝的应力在300 MPa附近;相贯线焊缝的应力呈 180°对称分布,在腰线附近存在 352.0 MPa的最大应力,顶部和底部基本不存在应力.
Abstract
The diversion steel branch pipe is large and complex to weld,requiring endurance for long-term water pressure of 6 MPa.There is a need for a high-precision,high-resolution stress measurement tech-nique for comprehensive assessment during water pressure tests.Traditional strain gauges are limited to lo-calized measurements and restricted by waterproofing,application processes,and temperature changes.This study proposes using optical frequency domain reflectometry for stress measurement in the pipe.A standard single-mode fiber sensor is laid along the weld seam for a spatial resolution of 5.8 cm.Stress corre-lates linearly with water pressure and varies periodically from 0.2 to 0.6 m along the weld seam.Maximum stress reaches 196.2 MPa at the crescent rib weld seam's waist,about 300 MPa at the main conical ring seam,and distributes symmetrically along the intersecting line,with a peak of 352.0 MPa near the waist-line and minimal stress at the top and bottom.
关键词
分布式应力测量/光频域反射仪/引水钢岔管/抽水蓄能Key words
distributed stress measurement/optical frequency domain reflectometer/diversion steel branch pipe/pumped storage引用本文复制引用
基金项目
国家重点研发计划资助项目(2023YFF0715700)
出版年
2024
国家科技期刊平台
NSTL
万方数据