Split Bar Hopkinson with Springs Striker Bar Launcher

Abstract:

Research on the dynamic strength of various materials such as metallic materials, polymers, concrete has been done by many researchers. The Split Hopkinson Bar method is still used to produce a high strain rate. In this method, a striker bar is usually launched using pressurized gas. However, high security system is required to prevent leakage as the operating pressure is very high. Avoiding the use of high-pressure gas, in this study, a mechanical system of springs used to propel the Striker Bar. By varying the spring deflection of 1 cm to 8 cm, a linear Striker Bar velocity from 2.17 m/s until 19.45 m/s is obtained. Aluminum alloy Al-2024 has been tested with this tool and it is found that at the maximum Striker Bar velocity, strain rate on the material can be reach 1132 s^-1, and dynamic compression yield strength increase 56% from quasi-static compression yield strength.

• Periodical: Applied Mechanics and Materials (Volume 493)
• Pages: 383-387
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.493.383
• Online since: January 2014
• Authors: Agus Sigit Pramono, Sujarwanto Sujarwanto, Handik Rivazani
• Keywords: Dynamic Strength, Hopkinson Bar, Strain Rate

References

[1] Kolsky, H. , An Investigation of The Mechanical Properties of Material at Very High Rates Loading, Proc. R. Soc. Lond, B62, 6760-700, (1949).

[2] C.M. Roland, et. High Strain Rate Mechanical behavior of Polyurea, Polymer 48, 574-578, (2006).

DOI: 10.1016/j.polymer.2006.11.051

[3] Chen, W., Lu, F., and Cheng, M. , Tension and compression tests of two polymers under quasistatic and dynamic loading, Polymer Testing, 21, 113-121, (2002).

DOI: 10.1016/s0142-9418(01)00055-1

[4] Mariam Farauk Ghazy and Metwally Abd. Allah Abd. Elaty, Influence of Strain Rate on Compressive Properties on Concrete, 12th International Colloquium on Structural and Geotechnical Engineering, (2007).

[5] S. Abotula and V.B. Chalivendra, An Experimental and Numerical Investigation of The Static and Dynamic Constitutive Behaviour of Aluminium Alloys, The Journal of Strain Analysis for Engineer Design, 45: 535, (2010).

DOI: 10.1177/030932471004500808

[6] Sasi Bhushan, et. Compressive Deformation Behavior of Al 2024 alloy using 2D and 4D processing maps, J Mater Sci, 46: 3191-3199, (2011).

DOI: 10.1007/s10853-010-5203-z

[7] YU Shui-sheng, LU Yu-bin, CAI Yong, The Strain-rate Effect of Engineering Materials and Its Unified Model, Latin American Journal of Solids and Structures, Vol. 10, No. 4, Rio Janeiro, (2013).

DOI: 10.1590/s1679-78252013000400010