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首页> 外文期刊>Thin-Walled Structures >Experimental investigation on the post-fire mechanical properties of structural aluminum alloys 6061-T6 and 7075-T73
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Experimental investigation on the post-fire mechanical properties of structural aluminum alloys 6061-T6 and 7075-T73

机译：结构铝合金6061-T6和7075-T73射击后力学性能的实验研究

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摘要

Aluminum alloys are increasingly used in engineering structures. During fire hazards, aluminum alloy structures are inevitably exposed to elevated temperatures. Provided structural collapse does not occur after a fire, a reliable evaluation of the residual performances of the structures is needed to decide whether the structures should be dismantled, repaired, or directly reused. Therefore, an experimental investigation was conducted to reveal the post-fire mechanical properties of two widely used structural aluminum alloys, namely, 6061-T6 and 7075-T73. Specimens were initially heated to nine various pre-selected temperatures up to 550 degrees C and subsequently cooled down to ambient temperature by two different methods: air cooling and water cooling. Tensile coupon tests were performed on the specimens until fracture, and the post-fire stress-strain curves, elastic modulus, yield strength, ultimate strength, and ductility were obtained. The mechanical properties of 6061-T6 were dramatically reduced after exposure to temperatures exceeding 300 degrees C. For 7075-T73, the corresponding temperature was 200 degrees C. The post-fire mechanical properties were obviously influenced by cooling methods, particularly after cooling from a relatively high fire temperature. New predictive equations, where the influences of different cooling methods were incorporated, were proposed to evaluate the post-fire mechanical properties of the aluminum alloys 6061-T6 and 7075-T73. The results presented in this study are expected to lead to an accurate assessment of the post-fire performances of aluminum alloy structures. (C) 2016 Elsevier Ltd. All rights reserved.
机译：铝合金越来越多地用于工程结构中。在火灾危险中，铝合金结构不可避免地要暴露在高温下。如果火灾后不会发生结构倒塌，则需要对结构的剩余性能进行可靠的评估，以决定是否应拆除，修理或直接使用这些结构。因此，进行了一项实验研究，以揭示两种广泛使用的结构铝合金，即6061-T6和7075-T73的烧后力学性能。首先将样品加热到九种不同的预选温度，最高到550摄氏度，然后通过两种不同的方法冷却至环境温度：空气冷却和水冷却。在试样上进行拉伸试样试验直至断裂，并获得了火灾后的应力-应变曲线，弹性模量，屈服强度，极限强度和延展性。暴露于超过300摄氏度的温度后，6061-T6的机械性能会显着降低。对于7075-T73，其相应的温度为200摄氏度。冷却后方法（特别是从冷水机冷却后）明显影响后燃后的机械性能。相对较高的着火温度。提出了新的预测方程式，其中结合了不同的冷却方法的影响，以评估铝合金6061-T6和7075-T73的射击后力学性能。这项研究中提出的结果有望导致对铝合金结构的后燃性能的准确评估。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Thin-Walled Structures》 |2016年第9期|187-200|共14页
  • 作者

    Chen Zhihua; Lu Jie; Liu Hongbo; Liao Xiangwei;

  • 作者单位

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China|Tianjin Univ, China Minist Educ, Key Lab Coast Civil Struct Safety, Tianjin 300072, Peoples R China|Tianjin Univ, Dept Civil Engn, Tianjin 300072, Peoples R China;

    Tianjin Univ, Dept Civil Engn, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China|Tianjin Univ, China Minist Educ, Key Lab Coast Civil Struct Safety, Tianjin 300072, Peoples R China|Tianjin Univ, Dept Civil Engn, Tianjin 300072, Peoples R China;

    Tianjin Univ, Dept Civil Engn, Tianjin 300072, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aluminum alloy; Post-fire mechanical properties; Residual factor; Predictive equations; Cooling methods; Stress-strain relationship;

    机译：铝合金;火后力学性能;残余因子;预测方程;冷却方法;应力-应变关系;

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