A quartz-crystal-embedded split Hopkinson pressure bar for soft materials

A dynamic experimental technique that is three orders of magnitude as sensitive in stress measurement as a conventional split Hopkinson pressure bar (SHPB) has been developed. Experimental results show that this new method is effective and reliable for determining the dynamic compressive stress-strain responses of materials with low mechanical impedance and low compressive strengths, such as elastomeric materials and foams at high strain rates. The technique is based on a conventional SHPB. Instead of a surface strain gage mounted on the transmission bar, a piezoelectric force transducer was embedded in the middle of the transmission bar of a high-strength aluminum alloy to directly measure the weakly transmitted force profile from a soft specimen. In addition, a pulse-shape technique was used for increasing the rise time of the incident pulse to ensure stress equilibrium and homogeneous deformation in the low-impedance and low-strength specimen.

[1]  X. Zhang,et al.  Dynamic Response of Epon 828/T-403 Under Multiaxial Loading at Various Temperatures , 1997 .

[2]  J. E. Dorn,et al.  STRAIN-RATE EFFECTS. , 1970 .

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

[4]  D. A. Gorham,et al.  Stress Equilibrium in the Split Hopkinson Pressure Bar Test , 1997 .

[5]  G. Ravichandran,et al.  Dynamic compressive failure of a glass ceramic under lateral confinement , 1997 .

[6]  K. G. Hoge,et al.  Combined Strain Gauge—Quartz Crystal Instrumented Hopkinson Split Bar , 1969 .

[7]  D. J. Parry,et al.  The Hopkinson Bar , 1999 .

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

[9]  George T. Gray,et al.  Influence of Temperature and Strain Rate on the Mechanical Behavior of Adiprene L-100 , 1997 .

[10]  Dynamic deformation of metals under high hydrostatic pressure , 1966 .

[11]  Joseph W. Tedesco,et al.  Moisture and Strain Rate Effects on Concrete Strength , 1996 .

[12]  W. Baker,et al.  A Split Hopkinson Bar Technique to Evaluate the Performance of Accelerometers , 1996 .

[13]  E. A. Ripperger,et al.  Strain rate effects in cold worked high-purity Aluminium , 1966 .

[14]  J. Chaoufi,et al.  Asymptotic analysis of wave propagation in a finite viscoplastic bar , 1991 .

[15]  A. Lomunov,et al.  Methodological aspects of studying dynamic material properties using the Kolsky method , 1995 .

[16]  Lili Wang,et al.  Generalization of split Hopkinson bar technique to use viscoelastic bars , 1994 .

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

[18]  R. Graham.  Technique for Studying Piezoelectricity under Transient High Stress Conditions , 1961 .