کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6711894 | 1428720 | 2018 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of stress concentration and cooling methods on post-fire mechanical behavior of ASTM A36 steels
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This study aims to investigate the influence of stress triaxiality and cooling methods on post-fire mechanical behavior of ASTM A36 steels. To this end, ASTM A36 notched steel specimens are designed to generate a range of stress triaxialities. These specimens are subjected to target temperatures of 500â¯Â°C, 600â¯Â°C, 700â¯Â°C, 800â¯Â°C, 900â¯Â°C and 1000â¯Â°C, and then cooled down to room temperature using air-cooling and water-cooling methods. These specimens are then uniaxially tested to determine their post-fire mechanical properties. Non-linear finite element analysis is conducted using post-fire mechanical properties to obtain stress triaxiality distribution in notched test specimens subjected to different target temperatures and cooling methods. Finally, a Scanning Electron Microscope (SEM) study is conducted on fractured surfaces of representative un-notched and notched test specimens to investigate the influence of high stress triaxiality and cooling methods on fracture initiation and propagation mechanisms. The post-fire mechanical properties of ASTM A36 steels are found to remain almost unaffected when cooled from 600â¯Â°C, irrespective of cooling method. ASTM A36 steels experienced up to 14% degradation in ultimate tensile strength and up to 22% increase in fracture strain when air-cooled from temperatures beyond 700â¯Â°C. Post-fire ultimate tensile strength is observed to increase by up to 146% whereas fracture strain is observed to decrease by up to 76% when ASTM A36 specimens are water-cooled from high temperatures. High stress triaxiality resulted in up to 37% increase in ultimate tensile strength and up to 74% reduction in ductility of air-cooled specimens. Presence of high stress triaxiality and water-cooling from temperatures beyond 700â¯Â°C is observed to significantly increase the ultimate tensile strength (up to 252%) and substantially reduced the ductility (up to 98%) of ASTM A36 steels.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 186, 20 October 2018, Pages 920-945
Journal: Construction and Building Materials - Volume 186, 20 October 2018, Pages 920-945
نویسندگان
Hizb Ullah Sajid, Ravi Kiran,