Mechanical response and constitutive model of austenitic 304 stainless steel after exposure ISO 834 fire

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research Pub Date : 2024-11-13 DOI:10.1016/j.jcsr.2024.109144

Kang He , Yu Chen , Hongrui Lai , Xinghuo Wu

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引用次数: 0

Abstract

Stainless steel is increasingly used in renewable energy sectors due to its advantageous mechanical properties, corrosion resistance, and aesthetic appeal. However, exposure to high temperatures can significantly alter these properties, potentially compromising long-term performance in renewable energy infrastructure. This study investigates the effects of ISO 834 standard fire on the constitutive behavior of austenitic 304 stainless steel through experimental analysis. The findings indicate that cross-sectional weakening has a minimal impact on the post-fire degradation of stainless steel structures. After sufficient cooling, the elastic modulus and strain hardening index of fire-exposed stainless steel are restored to pre-fire levels. However, both the nominal yield strength and ultimate strength are significantly diminished after fire exposure, with these reductions being positively correlated with heating duration. Practical formulas are provided for predicting the nominal yield strength, ultimate strength, and ultimate strain of stainless steel after ISO 834 standard fire. Additionally, a stress-strain constitutive model has been developed that accurately predicts the full strain range observed in post-fire tensile tests of austenitic 304 stainless steel.

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奥氏体 304 不锈钢暴露于 ISO 834 火后的机械响应和构成模型

不锈钢具有良好的机械性能、耐腐蚀性和美观性，因此越来越多地应用于可再生能源领域。然而，暴露在高温下会显著改变这些特性，从而可能影响可再生能源基础设施的长期性能。本研究通过实验分析研究了 ISO 834 标准火灾对奥氏体 304 不锈钢构成行为的影响。研究结果表明，截面削弱对不锈钢结构火灾后降解的影响微乎其微。经过充分冷却后，受火灾影响的不锈钢的弹性模量和应变硬化指数可恢复到火灾前的水平。然而，名义屈服强度和极限强度在火灾暴露后会显著降低，这些降低与加热持续时间呈正相关。本文提供了实用的公式，用于预测不锈钢在 ISO 834 标准火灾后的名义屈服强度、极限强度和极限应变。此外，还开发了一种应力-应变构成模型，可准确预测奥氏体 304 不锈钢在火灾后拉伸试验中观察到的全部应变范围。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Constructional Steel Research 工程技术-工程：土木

CiteScore

7.90

自引率

19.50%

发文量

550

审稿时长

46 days

期刊介绍： The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.