Dynamic Compression Testing on Polymeric Foams

In order to experimentally obtain valid dynamic material properties of polymeric foams with split Hopkinson bars, necessary modifications on the technique are necessary. A sensitive transmitted signal measurement method must be employed to accurately determine the weak signals transmitted from the soft specimen. Proper pulse shapers are required to ensure that the foam specimen deforms at a constant strain rate under dynamic stress equilibrium. Dynamic equilibrium must be monitored directly in experiments. These modifications are briefly reviewed and discussed. Examples are given to show the necessity and validity of the modifications.

[1]  Sia Nemat-Nasser,et al.  Hopkinson techniques for dynamic recovery experiments , 1991, Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences.

[2]  B. Song,et al.  Loading and unloading split hopkinson pressure bar pulse-shaping techniques for dynamic hysteretic loops , 2004 .

[3]  D. Frew,et al.  Confinement effects on the dynamic compressive properties of an epoxy syntactic foam , 2003 .

[4]  H. Kolsky.  An Investigation of the Mechanical Properties of Materials at very High Rates of Loading , 1949 .

[5]  Fangyun Lu,et al.  High-strain-rate compressive behavior of a rigid polyurethane foam with various densities , 2002 .

[6]  M. J. Forrestal,et al.  Dynamic Compression Testing of Soft Materials , 2002 .

[7]  Weinong W Chen,et al.  Pulse shaping techniques for testing brittle materials with a split hopkinson pressure bar , 2002 .

[8]  Tamaki Yanagita,et al.  Temperature effects on dynamic compressive behavior of an epoxy syntactic foam , 2003 .

[9]  B. Song,et al.  Dynamic stress equilibration in split Hopkinson pressure bar tests on soft materials , 2004 .

[10]  Gérard Gary,et al.  On the use of a viscoelastic split hopkinson pressure bar , 1997 .

[11]  D. Frew,et al.  Dynamic Compressive Response and Failure Behavior of an Epoxy Syntactic Foam , 2004 .

[12]  Han Zhao,et al.  Behaviour characterisation of polymeric foams over a large range of strain rates , 2002 .

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

[14]  M. J. Forrestal,et al.  A split Hopkinson bar technique for low-impedance materials , 1999 .