Tensile Tests for Material Characterisation of High- and Ultra-High-Strength Steels S690QL and S960QL under Natural Fire Conditions

IF 2.3 3区工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY

Fire Technology Pub Date : 2024-02-21 DOI:10.1007/s10694-024-01551-7

Sara Uszball, Markus Knobloch

引用次数: 0

Abstract

The mechanical material behavior of mild steels is reversible in the cooling phase of natural fires, which is proven by experimental evidence. For the material behavior of high-strength steels during cooling, no results are yet available. The paper provides the first comprehensive test program on the constitutive material behavior of high-strength steels S690QL and S960QL as well as mild steel S355 J2 + N in the case of natural fires. It is elaborated that the mechanical material behavior of high-strength steels in the cooling phase differs from the behavior in the heating phase and is not reversible due to phase changes of the microstructure. A constitutive material model for structural fire design purposes is developed on the basis of experimental data and the soundness and reliability of the model are proven by a statistical study that systematically evaluates the deviation of the model prediction from the test data.

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自然火灾条件下高强度和超高强度钢 S690QL 和 S960QL 材料特性的拉伸试验

低碳钢在自然发火冷却阶段的机械材料行为是可逆的，这一点已得到实验证明。至于高强度钢在冷却阶段的材料行为，目前尚无结果。本文首次对高强度钢 S690QL 和 S960QL 以及低碳钢 S355 J2 + N 在自然火灾情况下的材料构成行为进行了全面测试。研究阐述了高强度钢在冷却阶段的材料力学行为与加热阶段的行为不同，并且由于微观结构的相变而不可逆。在实验数据的基础上开发了用于结构防火设计的材料构成模型，并通过统计研究证明了模型的合理性和可靠性，该研究系统地评估了模型预测与测试数据的偏差。

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

Fire Technology 工程技术-材料科学：综合

CiteScore

6.60

自引率

14.70%

发文量

137

审稿时长

7.5 months

期刊介绍： Fire Technology publishes original contributions, both theoretical and empirical, that contribute to the solution of problems in fire safety science and engineering. It is the leading journal in the field, publishing applied research dealing with the full range of actual and potential fire hazards facing humans and the environment. It covers the entire domain of fire safety science and engineering problems relevant in industrial, operational, cultural, and environmental applications, including modeling, testing, detection, suppression, human behavior, wildfires, structures, and risk analysis. The aim of Fire Technology is to push forward the frontiers of knowledge and technology by encouraging interdisciplinary communication of significant technical developments in fire protection and subjects of scientific interest to the fire protection community at large. It is published in conjunction with the National Fire Protection Association (NFPA) and the Society of Fire Protection Engineers (SFPE). The mission of NFPA is to help save lives and reduce loss with information, knowledge, and passion. The mission of SFPE is advancing the science and practice of fire protection engineering internationally.