火箭橇试验滑轨损伤对温度应力分布的影响机制与安全性研究

肖军; 张浩; 李俊耀

doi:10.7643/issn.1672-9242.2026.10.017

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装备环境工程 ›› 2026, Vol. 23 ›› Issue (10) : 151-157. DOI: 10.7643/issn.1672-9242.2026.10.017

环境试验与观测

火箭橇试验滑轨损伤对温度应力分布的影响机制与安全性研究

肖军, 张浩, 李俊耀

作者信息 +

Investigation on Influence Mechanism and Safety Assessment of Track Damage on Temperature Stress Distribution in Rocket Sled Test Rails

XIAO Jun, ZHANG Hao, LI Junyao

Author information +

文章历史 +

摘要

目的测试火箭橇试验滑轨温度应力分布,分析滑轨的安全性。方法针对某火箭橇试验场滑轨截面损伤修复后的力学响应与安全性问题,采用高精度应变电测法,对损伤截面及其相邻完好截面开展为期5 d的同步、连续温度-应变监测。通过对比温度循环载荷下不同位置的应变响应规律,结合滑轨温度应力经典理论,探讨局部损伤对轨内温度应力分布的影响机制,并通过极端温差理论模型评估损伤滑轨安全性。结果监测期内最大轨温差达24.5 ℃时,损伤截面与完好截面的温度-应变变化趋势高度一致,均符合线弹性理论。损伤截面最大应变值较完好截面最大增大6.2%,与基于截面削弱率的理论预测基本吻合,表明修复区仍能有效传递温度力。结论该研究方法为同类高精度、大温差工况下滑轨安全评估与维护决策提供技术依据与理论参考。

Abstract

The work aims to measure the temperature stress distribution in a rocket sled test rail and evaluate its structural safety. To address the mechanical response and safety concerns regarding a repaired rail section with localized damage, a high-precision electrical strain measurement method was employed. Synchronous and continuous temperature-strain monitoring was conducted over a five-day period on both the damaged section and an adjacent intact section. By comparing strain response patterns under cyclic temperature loading and integrating classical rail temperature stress theories, the influence mechanism of local damage on the internal temperature stress distribution was investigated. Furthermore, a theoretical model incorporating extreme temperature differences was utilized to assess the safety of the damaged rail. Under a maximum rail temperature difference of 24.5 ℃ during the monitoring period, the temperature-strain variation trends of the damaged and intact sections exhibited high consistency, conforming to the linear elastic theory. The maximum strain value in the damaged section increased by a maximum increment of 6.2% compared with that in the intact section, aligning closely with theoretical predictions based on the cross-sectional reduction rate, indicating that the repaired zone retained the capacity to effectively transmit temperature-induced forces. The proposed methodology provides critical technical foundations and theoretical references for the safety assessment and maintenance decision-making of rail systems operating under similar high-precision and large-temperature-difference conditions.

导出引用

肖军, 张浩, 李俊耀. 火箭橇试验滑轨损伤对温度应力分布的影响机制与安全性研究[J]. 装备环境工程. 2026, 23(10): 151-157 https://doi.org/10.7643/issn.1672-9242.2026.10.017

XIAO Jun, ZHANG Hao, LI Junyao. Investigation on Influence Mechanism and Safety Assessment of Track Damage on Temperature Stress Distribution in Rocket Sled Test Rails[J]. Equipment Environmental Engineering. 2026, 23(10): 151-157 https://doi.org/10.7643/issn.1672-9242.2026.10.017

中图分类号： TJ01

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