Behavior and general design method of concrete-filled high-strength steel tube (CFHST) columns

2021 ◽  
Vol 243 ◽  
pp. 112506
Author(s):  
Chengliang Tu ◽  
Yongjiu Shi ◽  
Dong Liu ◽  
Wenhao Wang ◽  
Huiyong Ban
Keyword(s):  
High Strength Steel ◽  
Design Method ◽  
High Strength ◽  
Steel Tube ◽  
General Design

Low-Alloy High-Strength Steel for Boiler Tubes (LowC-9Cr-2Mo)

1976 ◽  
Vol 98 (2) ◽  
pp. 173-178 ◽  
Author(s):  
T. Yukitoshi ◽  
K. Nishida ◽  
T. Oda ◽  
T. Daikoku
Keyword(s):  
High Temperature ◽  
High Strength Steel ◽  
Austenitic Stainless Steels ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Steel Tube ◽  
High Temperature Strength ◽  
Low Alloy Steels ◽  
Service Test ◽  
Alloy Steels

High-strength steel tube HCM9M (LowC-9Cr-2Mo) steel, which shows the intermediate high-temperature strength between austenitic stainless steels and commercial low-alloy steels, has been developed. It has superior weldability, workability and oxidation resistivity. At present HCM9M tubes have been in-service test as reheater and superheater tubing at the 165,000 kW boiler in Japan without trouble. This report deals with the practical properties of HCM9M steel, service test experience and high temperature strengthening mechanism of the steel from morphological viewpoint of carbide.

Steel Core in Composite Steel-Concrete Columns

2016 ◽  
Vol 691 ◽  
pp. 195-206
Author(s):  
Juraj Frólo ◽  
Štefan Gramblička
Keyword(s):  
Cross Section ◽  
Design Method ◽  
High Strength ◽  
Concrete Columns ◽  
Steel Tube ◽  
Experimental Investigations ◽  
Composite Columns ◽  
Steel Core ◽  
Composite Steel ◽  
Simplified Design Method

This paper presents some results of theoretical and experimental investigations of composite steel-concrete columns with solid steel profiles - steel cores. Due to absence of simplified design method according to EN 1994-1-1 [1], design of these columns in practice is limited in general. Reasons for this are residual stresses in steel profile caused by fabrication process and limitation of strains in concrete. Recommendations have been determined for simplified design method according to EN 1994-1-1 for composite columns made of high strength concrete filled steel tube with central steel core. Results of experimental research on composite columns with the cross-section made of steel core covered by reinforced concrete are presented.

Influence of Lubricants on Advanced High Strength Steel Tubes in Bending Process

2009 ◽  
Author(s):  
Ramakrishna Koganti ◽  
Sergio Angotti ◽  
Isadora van Riemsdijk ◽  
Robert C. Nelson ◽  
Jill Smith
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Steel Tube ◽  
Application Site ◽  
Structural Components ◽  
Advanced High Strength Steel ◽  
Steel Tubes ◽  
Automotive Body ◽  
Bending Process ◽  
Lubricant Performance

To reach safety, emissions, and cost objectives, manufacturers of automotive body structural components shape thin gauge, high strength steel tube using a series of manufacturing steps that often include bending, preforming and hydroforming. Challenging grades and bend severity require a sensitive optimization of the tubular bending process. Lubricants play a significant role in establishing a successful bending process. In this study, the performance of two lubricants, Hydrodraw 551 and HFO 20, were investigated for bending Dual Phase 780 (DP780) and High Strength Low Alloy 350 (HSLA350) thin-walled steel tubes. Formability success was evaluated in terms of wrinkling, thinning strain and final geometry. Lubricant performance was found to be sensitive to grade and application site. HFO 20 was found to be a poor choice for bending DP780 tube.

Strength Optimization of Infant Pop-Up Seat Frame Using Discrete Material and Thickness Optimization

2021 ◽  
Vol 11 (3) ◽  
pp. 1-20
Author(s):  
YeongJo Ju ◽  
Euysik Jeon
Keyword(s):  
Optimal Design ◽  
High Strength Steel ◽  
Design Method ◽  
High Strength ◽  
Optimization Method ◽  
Design Criterion ◽  
Thickness Optimization ◽  
Element Analysis ◽  
Strength Design ◽  
Seat Frame

In this paper, the authors proposed an optimal design method for the strength design of infant pop-up seat frame combined with rear seats for infants, children, and adults, not removable booster seats or car seats. Frame strength design was performed using discrete material and thickness optimization (DMTO) method considering high strength steel (HSS) and advanced high strength steel (AHSS). Structural design using the Section 4 link mechanism was performed, and the weakness of the seat frame due to static load was confirmed through finite element analysis. An optimal design criterion was established by carrying out a case study to derive the limiting conditions according to static and dynamic loads. In consideration of these criteria, the optimal design according to d-optimal and discrete Latin-hypercube (DLH) was performed among the design of experiments (DOE). And the strength of the pop-up seat frame for infants according to each DOE was checked, and the strength optimization method was suggested by comparing the lightweight ratio.

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