On the use of Bernstain-Bézier functions for modelling the post-fire stress-strain relationship of ultra-high strength steel (Grade 1200)

2018 ◽  
Vol 175 ◽  
pp. 605-616 ◽  
Author(s):  
Fatemeh Azhari ◽  
Amin Heidarpour ◽  
Xiao-Ling Zhao
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Steel Grade ◽  
Stress Strain ◽  
Ultra High Strength Steel ◽  
Strain Relationship ◽  
Relationship Of

scholarly journals Stress-strain relationship of high-strength steel (HSS) reinforcing bars

2018 ◽  
Author(s):  
Retno Anggraini ◽  
Tavio ◽  
I. Gede Putu Raka ◽  
Agustiar
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Reinforcing Bars ◽  
Stress Strain ◽  
Strain Relationship ◽  
Relationship Of

Experimental Research on Tensile-Shear Behavior of Spot-Welded Lap Joints of Ultra-High Strength Steel

2012 ◽  
Vol 226-228 ◽  
pp. 1720-1724 ◽  
Author(s):  
Yue Hua Liu ◽  
Hui Ping Yu ◽  
Wei Wei Wang ◽  
Xiao Yang Li ◽  
Shu Jun Chen
Keyword(s):  
Shear Stress ◽  
High Strength ◽  
Intermediate Frequency ◽  
Lap Joints ◽  
Tensile Shear ◽  
Ultra High Strength Steel ◽  
Strain Relationship ◽  
Pullout Failure ◽  
Relationship Of ◽  
Microstructure Of The Material

The ultra-high strength quenched 22MnB5 steel is researched in this paper, the intermediate frequency inverter & electric servo welding gun system is used to weld the sheets, experiments included of tensile-shear with synchronous electrical testing, microstructure of the material and fractures analysis and the Vickers-Hardness testing. The results point out that the maximum hardness is located at weld nugget, and the minimum hardness is appeared in heat affected zone (HAZ). Fracture is formed under the combined effects of shear stress and normal stress, the shear stress contributes to interfacial fracture, and leads to rupture. Non-uniformity of the microstructure caused by spot welding, changed the property of the material in nugget, stress-strain relationship of this area is nonlinear. The results also show that the conventional weld size guidance of 4√t is not sufficient to produce nugget pullout failure mode for 22MnB5 UHSS spot welds.

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