GMA08
Riunione del Gruppo Materiali
dell’Associazione Italiana di Meccanica Teorica ed Applicata (AIMETA)
29 febbraio e 1 marzo 2008, Genova
Strain localization and cyclic damage of
polyurethane foam cylinders in uniaxial cyclic
compression
Giampiero Pampolini, Gianpietro Del Piero
Dipartimento di Ingegneria, Università di Ferrara.
Laboratoire de Méchanique et d’Acoustique, CNRS., Marseille
Cyclic damage
16
Cycle1
Cycle2
Cycle3
14
Cycle4
Stress (kPa)
12
10
8
6
4
2
0
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
Deformation
Non homogeneous deformation
Model for strain localization
(G. Pampolini, G. Del Piero, Strain localization in polyurethane foams.
Experiments and theoretical model, in preparation )
Model for cyclic damage
(G. Del Piero, A Rheological Model for Cyclic Damage and Recoverable
Adhesion, Communication at the VI Meeting Unilateral Problems in
Structural Analysis, Siracusa 2007 )
contact
u
separation
u0
t
N
∑ An
σ =
KK
u
if u0N > u
K =M
0
if u0N ≤ u
σ
0
u01
u02 umax u03
u04
u
Results and Future developments
Tests performed by Gong et al.(2005)
Coupled Model
σ
εmax
ε
To perform more compression cyclic tests to better
understand the cyclic mechanical behavior.
To extend the model beyond the 1D case.