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Study of Thin Sandwich Beams With Steel Faces and Perforated Polymer Core in Bending Loading: Experiments and Simulations

[+] Author and Article Information
P. Lhuissier, Y. Brechet

SIMaP-GPM2, Grenoble Institute of Technology, CNRS, UJF, 101 rue de la physique BP46, 38402 Saint-Martin d’Heres, France

J.-P. Masse

R&D Auto Applications, ArcelorMittal Montataire, rue de St. Leu, 60761 Montataire Cedex; SIMaP-GPM2, Grenoble Institute of Technology, CNRS, UJF, 101 rue de la physique BP46, 38402 Saint-Martin d’Heres, France

L. Salvo1

SIMaP-GPM2, Grenoble Institute of Technology, CNRS, UJF, 101 rue de la physique BP46, 38402 Saint-Martin d’Heres, Franceluc.salvo@simap.grenoble-inp.fr

1

Corresponding author.

J. Appl. Mech 78(1), 014504 (Oct 13, 2010) (5 pages) doi:10.1115/1.4002364 History: Received February 15, 2010; Revised August 05, 2010; Posted August 12, 2010; Published October 13, 2010; Online October 13, 2010

The mechanical behavior of thin sandwich beams with steel faces and porous polymer core have been investigated using quasistatic four-points bending. Classic sandwich models predicting the behavior and the failure modes are improved to fit the particular configuration of the structure. Numerical simulations were set up in order to investigate damage at large strain. Macroscopic results are compared with analytical models and numerical simulations. Two numerical models of the core allowed confrontation of local behavior with experiments. Criteria for localization and damaging depending on core architecture are proposed.

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Figures

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Figure 1

The two models for the core: (a) homogeneous core: porosity is fA=q2/(p+q)2. (b) Heterogeneous core: porosities are fB1=0 and fB2=q/(p+q).

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Figure 2

Configuration of the four-points bending

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Figure 3

Response of experiments to bending loading

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Figure 4

Comparison of stiffnesses

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Figure 5

Comparison of critical loads

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Figure 6

Comparison of maximal loads

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Figure 7

Waves on the upper face of the sandwich structure (p=9 mm, q=6 mm) at a deflection of 40 mm

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Figure 8

Plastic strain of the upper face of the sandwich structure at 15 mm of deflection (p=3 mm, q=3 mm)

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Figure 9

Plastic strain on the upper face of the sandwich structure with deflection (heterogeneous core model (B), p=6 mm, and q=6 mm)

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Figure 10

Limits of initiation of waves with deflection for several threshold. Marks correspond to Δεp=0.15% for several core configurations and define the boundary

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Figure 11

Limits of initiation of localization with deflection for several thresholds

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