Characterization of polymeric structural foams under compressive impact loading by means of energy-absorption diagram

The mechanical properties at room temperature of three polymeric foams (namely EPP, PUR and PS/PA foams) have been experimentally evaluated in both static and impact loading conditions. The energy absorption characteristics have been examined both through the energy-absorption diagram method and through the e$ciency diagram method. The meaning of the e$ciency parameter, already used in the literature, has been explained in a proper, satisfactory way. It is shown that the maximum of the e$ciency identi"es the condition for optimal energy absorption of the foam, while the maximum stress reaches a value limited through other design considerations. The e$ciency diagram method is then used to obtain synthetic diagrams useful to characterize the material and to help the design of energy absorbing components. These synthetic selection diagrams are obtained for the three tested materials. Finally, some consideration are drawn comparing the mechanical performance of the three considered types of foams and their dependency on density. 2001 Elsevier Science Ltd. All rights reserved.

[1]  Giovanni Belingardi,et al.  Comportamento statico e dinamico di schiume strutturali per l’assorbimento di energia , 1999 .

[2]  Clifford C. Chou,et al.  Development of foam models as applications to vehicle interior , 1995 .

[3]  Clifford C. Chou,et al.  Comparative Analysis of Different Energy Absorbing Materials for Interior Head Impact , 1995 .

[4]  O. Hopperstad,et al.  Static and dynamic crushing of square aluminium extrusions with aluminium foam filler , 2000 .

[5]  Michael F. Ashby,et al.  Failure surfaces for cellular materials under multiaxial loads—I.Modelling , 1989 .

[6]  Massimiliano Avalle,et al.  Energy absorption characteristic of polymeric structural foams for passive safety applications , 1999 .

[7]  Clifford C. Chou,et al.  Constitutive Modeling of Energy Absorbing Foams , 1994 .

[8]  S. Mizrahi,et al.  Mechanical properties and behavior of open cell foams used as cushioning materials , 1990 .

[9]  Gajanan V. Gandhe,et al.  High Efficiency Energy Absorption Olefinic Foam , 1999 .

[10]  David F. Sounik,et al.  Dynamic Impact Testing of Polyurethane Energy Absorbing (EA) Foams , 1994 .

[11]  M. Ashby,et al.  Cellular solids: Structure & properties , 1988 .

[12]  K. C. Rusch Load–compression behavior of flexible foams , 1969 .

[13]  K. C. Rusch Energy‐absorbing characteristics of foamed polymers , 1970 .

[14]  Noboru Kikuchi,et al.  Constitutive Modeling and Material Characterization of Polymeric Foams , 1997 .

[15]  K. C. Rusch Load-compression behavior of brittle foams , 1970 .

[16]  Michael F. Ashby,et al.  Failure surfaces for cellular materials under multiaxial loads—II. Comparison of models with experiment , 1989 .

[17]  Joseph Miltz,et al.  Energy absorption characteristics of polymeric foams used as cushioning materials , 1990 .

[18]  Noboru Kikuchi,et al.  Constitutive modeling of polymeric foam material subjected to dynamic crash loading , 1998 .

[19]  M. C. Shaw,et al.  The plastic behavior of cellular materials , 1966 .

[20]  M. Langseth,et al.  Static crushing of square aluminium extrusions with aluminium foam filler , 1999 .

[21]  C. C. Chou,et al.  Characterization of Foam Under Impact Loading , 1996 .

[22]  James A. Sherwood,et al.  Constitutive modeling and simulation of energy absorbing polyurethane foam under impact loading , 1992 .