Experimental and numerical study on the effects of friction and specimen dimension in split Hopkinson pressure bar

Authors

1 School of mechanical Engineering, Iran University of Science and Technology

2 School of Mechanical Engineering, Iran University of Science and Technology, Tehran.

Abstract

Split Hopkinson pressure bar apparatus (SHPB) is used commonly for determining high strain rate material properties. The validity of the SHPB test results depend on many parameters. In this paper, the effect of specimen dimension (aspect ratio) as well as friction on test results is studied both numerically and experimentally. ABAQUS/Explicit is used for numerical study. To this end, the signals at strain gage positions (on input and out bars) are extracted and stress-strain curve of the specimen is determined using wave propagation analysis. By comparing these stress-strain curves for different states of friction and specimen dimensions, the validity of the experimental and numerical results are checked. By increasing friction, the stress increase and strain decrease in the output stress-strain curve and the best result is for no friction condition. Its is observed that by increasing the aspect ratio, the discrepancy of the results for different friction conditions decreases. Specifically, in simulation results, the difference between maximum stresses of with and without lubrication for aspect ratios 0.25, 0.5, 1.0 and 1.5 are 58%, 18%, 9% and 5%, respectively which is in agreement with experimental trends. In other words, different stress-strain curves are obtained for different aspect ratios in the presence of friction which is mainly due to the friction effect rather than strain rate effect. As the friction increases, the error will reduce the overall strain of the sample and increase the yield stress.

Keywords

Main Subjects

References

 
[1]  اعتمادی ا, زمانی اشنی ج, موسوی م, فرانچسکنی ا. )1393) طراحی، ساخت و آزمایش دستگاه میله هاپکینسون برای تعیین تنش جریان در فلز مس در نرخ کرنش های بالا. مواد پرانرژی. 9(2 (پیاپی 23)):-.
[2] Gray GT. (2000). Classic split-Hopkinson pressure bar testing. ASM Handbook, Mechanical testing and evaluation. American society for metals.
[3] Perogamvros N, Mitropoulos T, Lampeas G. (2016). Drop Tower Adaptation for Medium Strain Rate Tensile Testing. Exp Mech. 56(3):419-436.
[4] Jordan JL, Siviour CR, Sunny G, Bramlette C, Spowart JE. (2013). Strain rate-dependant mechanical properties of OFHC copper. J Mater Sci. 48(20):7134-7141.
[5] Bell JF. (1966). An experimental diffraction grating study of the quasi-static hypothesis of the split hopkinson bar experiment. J. Mech Phys Sol. 14(6):309-327.
[6] Lifshitz J, Leber H. (1994). Data processing in the split Hopkinson pressure bar tests. Int J Impact Eng. 15(6):723-733.
[7] Follansbee PS. (1985). The hopkinson bar. Metals handbook. 8(9):198-217.
[8] Zencker U, Clos R. (1999). Limiting conditions for compression testing of flat specimens in the split hopkinson pressure bar. Exp Mech. 39(4):343-348.
[9] Hartley RS, Cloete TJ, Nurick GN. (2007). An experimental assessment of friction effects in the split Hopkinson pressure bar using the ring compression test. Int J Impact Eng. 34(10):1705-1728.
[10] Meng H, Li QM. (2003). Correlation between the accuracy of a SHPB test and the stress uniformity based on numerical experiments. Int J Impact Eng. 28(5):537-555.
[11] Naghdabadi R, Ashrafi M, Arghavani J. (2012). Experimental and numerical investigation of pulse-shaped split Hopkinson pressure bar test. Mat Sci Eng A-Struct. 539:285-293.
[12] Bagher Shemirani A, Naghdabadi R, Ashrafi MJ. (2016). Experimental and numerical study on choosing proper pulse shapers for testing concrete specimens by split Hopkinson pressure bar apparatus. Constr Build Mater. 125:326-336.
[13] Mohamadzadeh M, Davoodi B. (2021). Finite element simulation of Hopkinson compression test to investigate the dynamic behavior of composite materials. J Sci Tech Comp. 7(4):1263-1270.
[14] Zhong WZ, Rusinek A, Jankowiak T, Abed F, Bernier R, Sutter G. (2015). Influence of interfacial friction and specimen configuration in Split Hopkinson Pressure Bar system. Tribol Int. 90:1-14.
[15] Siviour CR, Walley SM. (2018). Inertial and frictional effects in dynamic compression testing. The Kolsky-Hopkinson Bar Machine. Springer; p. 205-247.
[16] Tyas A, Ozdemir Z.(2014).On backward dispersion correction of Hopkinson pressure bar signals. Philos Trans R Soc A. 372(2023):20130291.
[17] Bragov AM, Lomunov AK, Lamzin DA, Konstantinov AY. (2019). Dispersion correction in split-Hopkinson pressure bar: theoretical and experimental analysis. Continuum Mech Therm.1-13.
[18] Majzoobi GH, Rahmani K, Atrian A. (2018). An Experimental Investigation into Wear Resistance of Mg-SiC Nanocomposite Produced at High Rate of Compaction. J Stress Anal. 3(1):35-45.
 
[19] Quinn R, Zhang L, Cox M, Townsend D, Cartwright T, Aldrich-Smith G, Hooper P, Dear J. (2020). Development and Validation of a Hopkinson Bar for Hazardous Materials. Exp Mech. 60(9):1275-1288.
[20] Chouhan H, Asija N, Gebremeskel SA, Bhatnagar N. (2017). Effect of Specimen Thickness on High Strain Rate Properties of Kevlar/Polypropylene Composite. Procedia Engineer. 173:694-701.
[21] Xu P, Tang L, Zhang Y, Ni P, Liu Z, Jiang Z, Liu Y, Zhou L. (2022). SHPB experimental method for ultra-soft materials in solution environment. International J. Imp Engng. 159:104051.
[22] Kim Y-B, Kim J. (2021). Influence of Specimen Thickness on the Acquisition of Al6061-T6 Material Properties Using SHPB and Verified by FEM. Mater. 14(1):205.
[23] Asadi P, Ashrafi MJ, Fakhimi A. (2021). Physical and numerical evaluation of effect of specimen size on dynamic tensile strength of rock. Comput Geotech.104538.
[24] Wang J, Ma L, Zhao F, Lv B, Gong W, He M, Liu P. (2022). Dynamic strain field for granite specimen under SHPB impact tests based on stress wave propagation. Underground Space.
]25[ نقدآبادی ر, اشرفی مج, سهراب‌پور س. (2011). مطالعه تجربی و عددی پارامترهای مؤثر بر شکل‌دهی موج ورودی در آزمایش میله فشاری هاپکینسون. فصلنامه مکانیک هوافضا. 6(4):-.
[26] Panowicz R, Konarzewski M. (2020). Influence of imperfect position of a striker and input bar on wave propagation in a split Hopkinson pressure bar (SHPB) setup with a pulse-shape technique. Appl Sci. 10(7):2423.
[27] Fan X, Suo T, Sun Q, Wang T. (2013). Dynamic mechanical behavior of 6061 al alloy at elevated temperatures and different strain rates. Acta Mech Solida Sin. 26(2):111-120.
Journal of Solid and Fluid Mechanics
Volume 12, Issue 5
November and December 2022
Pages 1-11

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