Collapse mechanisms of sandwich beams with composite faces and a foam core, loaded in three-point bending. Part II: experimental investigation and numerical modelling

2004 ◽  
Vol 46 (4) ◽  
pp. 585-608 ◽  
Author(s):  
Craig A. Steeves ◽  
Norman A. Fleck
Keyword(s):  
Experimental Investigation ◽  
Numerical Modelling ◽  
Foam Core ◽  
Sandwich Beams ◽  
Three Point Bending ◽  
Collapse Mechanisms

Experimental Investigation of Failure Modes for Sandwich Beams

2017 ◽  
Vol 754 ◽  
pp. 115-118 ◽  
Author(s):  
Liviu Marșavina ◽  
Dan Andrei Şerban ◽  
Camelia Pop ◽  
Radu Negru
Keyword(s):  
Experimental Investigation ◽  
Aluminum Alloy ◽  
Mechanical Behavior ◽  
Failure Modes ◽  
Polyurethane Foams ◽  
Shear Stresses ◽  
Sandwich Beams ◽  
Three Point Bending ◽  
Rigid Polyurethane Foams

In this paper, the mechanical behavior in three-point bending was investigated for four different sandwich beams composed of aluminum alloy 1050 H24 faces and Necuron rigid polyurethane foams. The tests were conducted according to the recommendations of ASTM C393-00. Three different failure modes were observed (yielding of faces, face and core indentation and shear of core), being in accordance with the modes deducted from the calculated values of bending and shear stresses.

Experimental investigation of the three-point bending properties of sandwich beams with polyurethane foam-filled lattice cores

Structures ◽  
2020 ◽  
Vol 28 ◽  
pp. 424-432 ◽  
Author(s):  
Hossein Taghipoor ◽  
Arameh Eyvazian ◽  
Farayi Musharavati ◽  
T.A. Sebaey ◽  
Ahmad Ghiaskar
Keyword(s):  
Experimental Investigation ◽  
Polyurethane Foam ◽  
Sandwich Beams ◽  
Bending Properties ◽  
Three Point Bending ◽  
Foam Filled

Quasi-Static Three-Point Bending of Carbon Fiber Sandwich Beams With Square Honeycomb Cores

2011 ◽  
Vol 78 (3) ◽  
Author(s):  
B. P. Russell ◽  
T. Liu ◽  
N. A. Fleck ◽  
V. S. Deshpande
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Fe Model ◽  
Sandwich Beams ◽  
Carbon Fiber Composite ◽  
Three Point Bending ◽  
Collapse Mechanisms ◽  
Honeycomb Cores ◽  
Analytical Expressions ◽  
Good Agreement

Sandwich beams comprising identical face sheets and a square honeycomb core were manufactured from carbon fiber composite sheets. Analytical expressions were derived for four competing collapse mechanisms of simply supported and clamped sandwich beams in three-point bending: core shear, face microbuckling, face wrinkling, and indentation. Selected geometries of sandwich beams were tested to illustrate these collapse modes, with good agreement between analytic predictions and measurements of the failure load. Finite element (FE) simulations of the three-point bending responses of these beams were also conducted by constructing a FE model by laying up unidirectional plies in appropriate orientations. The initiation and growth of damage in the laminates were included in the FE calculations. With this embellishment, the FE model was able to predict the measured load versus displacement response and the failure sequence in each of the composite beams.

The Failure Behavior of Geometrically Asymmetric Metal Foam Core Sandwich Beams Under Three-Point Bending

2014 ◽  
Vol 81 (7) ◽  
Author(s):  
Jianxun Zhang ◽  
Qinghua Qin ◽  
Weilong Ai ◽  
Huimin Li ◽  
T. J. Wang
Keyword(s):  
Failure Mechanism ◽  
Failure Modes ◽  
Metal Foam ◽  
Minimum Weight ◽  
Failure Behavior ◽  
Foam Core ◽  
Sandwich Beams ◽  
Three Point Bending ◽  
Initial Failure ◽  
Core Height

The failure behavior of geometrically asymmetric sandwich beams with a metal foam core is analytically and experimentally investigated. New initial failure modes of the asymmetric sandwich beams are observed under three-point bending, i.e., face yield, face wrinkling, core shear A, core shear AB, core shear A-AB, and indentation. It is shown that the initial failure modes of sandwich beams depend on the span of the beam, the thicknesses of top and bottom face sheets, core height and material properties. We derived the analytical formulae for the initial failure loads and then constructed the initial failure mechanism maps for the geometrically asymmetric sandwich beams. It is shown that the analytically predicted initial failure mechanism maps are in good agreement with the experimental results, which are clearly different from the symmetric sandwich beams. As a preliminary application, the minimum weight designs are presented for asymmetric metal sandwich beams.

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