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

doi:10.7643/issn.1672-9242.2026.10.017

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (10) : 151-157. DOI: 10.7643/issn.1672-9242.2026.10.017

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

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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.

Key words

rocket sled / slide rail / stress-free rail temperature / temperature stress / electrical strain measurement / damage assessment / safety analysis

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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

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