Postbuckling behaviour of foam-filled, thin-walled steel beams

Within the WELLFORMED research project, ongoing at the CEMSIG Research Center of the Politehnica University of Timisoara, a new technological solution was proposed for built-up beams made of corrugated steel sheets for the web and thin-walled cold-formed steel profiles for the flanges, connected by spot welding. The research project integrates an extensive experimental program on such beams, using full scale specimens, to demonstrate the feasibility of the proposed solutions and to assess their performance, followed by numerical simulations to characterize and optimize the connecting details. The present paper presents the results of a large experimental program, on small specimens subjected to shear, consisting of two or three layers of steel sheet connected by spot welding.

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On Problem of Torsional Characteristics of Thin-walled Steel Beams with Web Openings

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/471/5/052040 ◽

2019 ◽

Vol 471 ◽

pp. 052040

Author(s):

Martin Horacek ◽

Jindrich Melcher ◽

Ivan Balazs ◽

Ondrej Pesek

Keyword(s):

Steel Beams ◽

Web Openings ◽

Thin Walled

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Study on the Composite Structure of Aluminum Foam-Filled Thin-Walled Metal Tube to Reduce the Charge Overload inside the Projectile during the Penetration Process

Shock and Vibration ◽

10.1155/2020/8887893 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

Fudi Liang ◽

Zengyou Liang ◽

Dezhi Deng

Keyword(s):

Reinforced Concrete ◽

Stress Analysis ◽

Composite Structure ◽

High Speed ◽

Aluminum Foam ◽

Metal Tube ◽

Penetration Process ◽

Mathematical Expressions ◽

Foam Filled ◽

Thin Walled

When a projectile penetrates a target at high speed, the charge loaded inside the projectile usually bears a high overload, which will consequently severely affect its performance. In order to reduce the overload of the charge during the penetration process, the structure of the projectile was improved by adding two buffers at both ends of the charge. In this study, the mathematical expressions were first gained about the axial buffering force generated by the thin-walled metal tube, aluminum foam, and the composite structure of aluminum foam-filled thin-walled metal tube when they were impacted by the high-speed mass block through reasonable assumptions and stress analysis. During the experiment on the high-speed projectile penetrating reinforced concrete target, the acceleration curve of the charge and the projectile body were obtained. The results show that the maximum overload that the charge was subjected to during the launch and penetration process was significantly reduced, and the change in overload, which the charge was subjected to during the penetration process, was also less obvious.

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