NUMERICAL STUDY AND DESIGN METHOD OF HIGH STRENGTH STEEL WELDED BOX COLUMNS

High strength steel box columns are usually fabricated from steel slab by applying welding. The welding process can introduce residual stresses and geometric imperfections into the columns and influence the column strength. In this study, a numerical investigation on the behavior of high strength steel thin-walled box columns under the compression force was carried out. The welding processes were firstly simulated with commercial package ABAQUS in this study to find out the residual stress distributions in high strength steel box column. After that, the column behaviors under the compression were modelled with predefined field from the previous step. The effect of the welding process (including flux-core arc welding and submerged arc welding), heating treatment (including preheating and post-weld heat treatment) and geometrical imperfection on the residual stress field and box column strength was investigated and discussed.

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STUDY ON A DESIGN METHOD OF A HIGH-STRENGTH STEEL PIPE SHEET PIPL(570N/mm2 GRADE) TO SHEET PILE QUAYWALLS

Journal of Japan Society of Civil Engineers Ser B3 (Ocean Engineering) ◽

10.2208/jscejoe.70.i_840 ◽

2014 ◽

Vol 70 (2) ◽

pp. I_840-I_845

Author(s):

Yoshio SHIOZAKI

Keyword(s):

High Strength Steel ◽

Design Method ◽

High Strength ◽

Steel Pipe ◽

Sheet Pile

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Quadrilateral Shape Rib Forming by Roll Forming Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.878.296 ◽

2018 ◽

Vol 878 ◽

pp. 296-301

Author(s):

Dong Won Jung

Keyword(s):

Automotive Industry ◽

High Strength Steel ◽

Numerical Study ◽

Thickness Distribution ◽

High Strength ◽

Metal Sheet ◽

Product Performance ◽

Roll Forming ◽

Forming Process ◽

Roll Forming Process

The roll forming is one of the simplest manufacturing processes for meeting the continued needs of various industries. The roll forming is increasingly used in the automotive industry to form High Strength Steel (HSS) and Advanced High Strength Steel (AHSS) for making structural components. In order to reduce the thinning of the sheet product, traditionally the roll forming has been suggested instead of the stamping process. The increased product performance, higher quality, and the lowest cost with other advantages have made roll forming processes suitable to form any shapes in the sheets. In this numerical study, a Finite Element Method is applied to estimate the stress, strain and the thickness distribution in the metal sheet with quadrilateral shape, ribs formed by the 11 steps roll forming processes using a validated model. The metal sheet of size 1,000 × 662 × 1.6 mm taken from SGHS steel was used to form the quadrilateral shape ribs on it by the roll forming process. The simulation results of the 11 step roll forming show that the stress distribution was almost uniform and the strain distribution was concentrated on the ribs. The maximum thinning strain was observed in the order of 15.5 % in the middle rib region possibly due to the least degree of freedom of the material.

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