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Experimental and numerical study on crashworthiness of cold-formed dimpled steel columns
AbstractThe UltraSTEEL® forming process forms plain steel sheets into dimpled steel sheets and this process increases the sheet material's strengths by generating plastic deformation on the material during the process. This paper presented experimental testing and developed a finite element (FE) model to predict the energy absorption characteristics of dimpled thin-walled structures under axial impact loads, and compared the energy absorption efficiencies (specific energy absorption) of plain and dimpled columns. Dynamic experimental tests were conducted using the drop tower at two different impact velocities. Explicit FE analysis were then carried out to simulate the experiments. The FE method was validated by comparing the numerical and experimental failure modes, crushing force response and specific energy absorptions. The validated FE method was then applied in an optimization study on the parameter of forming depth. The effects of forming depth on both geometry and material properties have been taken into account in the optimization study. It has been found that the specific energy absorption of dimpled columns is up to 16.3% higher than the comparable plain columns.
HighlightsFE models were developed to predict energy absorption of the UltraSTEEL® columns.Dynamic crushing tests were conducted at two different impact velocities.The finite element models were validated by comparing with experimental results.SEA of the UltraSTEEL® columns are about 10% higher than plain columns.An optimization study on forming depth was carried out.
Experimental and numerical study on crashworthiness of cold-formed dimpled steel columns
AbstractThe UltraSTEEL® forming process forms plain steel sheets into dimpled steel sheets and this process increases the sheet material's strengths by generating plastic deformation on the material during the process. This paper presented experimental testing and developed a finite element (FE) model to predict the energy absorption characteristics of dimpled thin-walled structures under axial impact loads, and compared the energy absorption efficiencies (specific energy absorption) of plain and dimpled columns. Dynamic experimental tests were conducted using the drop tower at two different impact velocities. Explicit FE analysis were then carried out to simulate the experiments. The FE method was validated by comparing the numerical and experimental failure modes, crushing force response and specific energy absorptions. The validated FE method was then applied in an optimization study on the parameter of forming depth. The effects of forming depth on both geometry and material properties have been taken into account in the optimization study. It has been found that the specific energy absorption of dimpled columns is up to 16.3% higher than the comparable plain columns.
HighlightsFE models were developed to predict energy absorption of the UltraSTEEL® columns.Dynamic crushing tests were conducted at two different impact velocities.The finite element models were validated by comparing with experimental results.SEA of the UltraSTEEL® columns are about 10% higher than plain columns.An optimization study on forming depth was carried out.
Experimental and numerical study on crashworthiness of cold-formed dimpled steel columns
Liang, Ce (author) / Wang, Chang Jiang (author) / Nguyen, Van Bac (author) / English, Martin (author) / Mynors, Diane (author)
Thin-Walled Structures ; 112 ; 83-91
2016-12-21
9 pages
Article (Journal)
Electronic Resource
English
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