PARAMETERS OF RANDOM CRITICAL STRENGTH OF PLASTIC HINGES OF THIN-WALLED BARS

2000 ◽  
Author(s):  
A. BIEGUS ◽  
D. MĄDRY
Keyword(s):  
Plastic Hinges ◽  
Critical Strength ◽  
Thin Walled

scholarly journals In-plane critical strength of thin-walled steel frames subjected to vertical loads.

1986 ◽  
pp. 75-84
Author(s):  
Hiroshi NAKAI ◽  
Susumu EMI ◽  
Toshihiro MIKI
Keyword(s):  
Steel Frames ◽  
Critical Strength ◽  
Thin Walled

scholarly journals An approximate method for calculating critical strength of thin-walled steel frames.

1987 ◽  
pp. 263-272
Author(s):  
Hiroshi NAKAI ◽  
Toshihiro MIKI ◽  
Kazuo OHGAKI
Keyword(s):  
Approximate Method ◽  
Steel Frames ◽  
Critical Strength ◽  
Thin Walled

An Upper-Bound Solution for Tube Cropping

1985 ◽  
Vol 107 (4) ◽  
pp. 365-371
Author(s):  
R. S. Rao ◽  
P. K. Wright
Keyword(s):  
Upper Bound ◽  
Plastic Hinge ◽  
Numerical Differentiation ◽  
Strain Theory ◽  
Deformation Pattern ◽  
Plastic Hinges ◽  
Bound Solution ◽  
Upper Bound Solution ◽  
Collapse Mode ◽  
Thin Walled

An upper-bound solution for the cropping of thin-walled tubes is developed, based on a plastic hinge approach, to predict the load-deflection behavior up to the point of shearing. A simple strain theory is used to estimate the deflection at the maximum cropping load. A deformation pattern (collapse mode) is proposed consisting of plastic hinges and then, for any given deflection, the associated plastic work is calculated. Subsequently, the cropping load is estimated by numerical differentiation with respect to the deflection. Comparisons are made with experiment.

Energy Absorption of Thin-Walled Beams with a Pre-Folded Origami Pattern

2014 ◽  
Vol 566 ◽  
pp. 569-574 ◽  
Author(s):  
Jia Yao Ma ◽  
Zhong You
Keyword(s):  
Energy Absorption ◽  
Cross Sections ◽  
Longitudinal Direction ◽  
Peak Force ◽  
Plastic Hinges ◽  
Novel Structure ◽  
Collapse Mode ◽  
Transport Vehicle ◽  
Thin Walled ◽  
Energy Absorption Ratio

The bumper beam of a transport vehicle conventionally is commonly made from thin-walled materials with a shallow curved profile, with either opened or closed cross sections. Upon lateral crushing, it fails in a bending collapse mode characteristic of formation of a limited number of plastic hinges along the beam. This paper presents a novel structure known as the origami beam. It is a thin-walled shallow curved beam of square cross section whose surface is pre-folded according to an origami pattern. The origami pattern serves as a mode inducer to trigger a collapse mode that is more efficient in terms of energy absorption. Numerical simulation of the beam subjected to quasi-static lateral loading shows that a new collapse mode, referred to as the longitudinal folding mode featuring shortening of beam in the longitudinal direction prior to the formation of plastic hinges, can be triggered by the pre-folded origami pattern, leading to higher energy absorption and lower peak force than those of conventional ones. An increase in specific energy absorption (ratio between energy absorption and weight of the structure) of 23.6% being achieved in an optimum case, while the peak force is also reduced by 12.9%. Our work demonstrates that applying origami patterns to shallow curved thin-walled beams can effectively induce new collapse modes on the structures and increase the energy absorption capability.

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