Two-dimensional analysis of the split hopkinson pressure bar system

A series of split Hopkinson pressure bar tests on two-dimensional and three-dimensional woven composites were presented in order to obtain a reliable comparison between the two types of composites and the effect of the z-yarns along the third direction. These tests were done along different configurations: in-plane and out-of-plane compression test. For the three-dimensional woven composite, two different configurations were studied: compression responses along to the stitched direction and orthogonal to the stitched direction. It was found that three-dimensional woven composites exhibit an increase in strength for both: in-plane and out-of-plane tests.

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Feasibility of Two-Dimensional Numerical Analysis of the Split-Hopkinson Pressure Bar System

Journal of Applied Mechanics ◽

10.1115/1.3423209 ◽

1974 ◽

Vol 41 (1) ◽

pp. 137-144 ◽

Cited By ~ 24

Author(s):

L. D. Bertholf

Keyword(s):

Numerical Analysis ◽

Numerical Solutions ◽

Split Hopkinson Pressure Bar ◽

Material Strength ◽

Two Dimensional ◽

Hopkinson Pressure Bar ◽

Interface Friction ◽

Elastic Plastic ◽

Split Hopkinson ◽

Pressure Bar

The feasibility of two-dimensional numerical analysis of the split-Hopkinson pressure bar experiment is proven. A general elastic-plastic artificial viscosity computer program is shown to give an adequate solution for two-dimensional elastic response of a pressure bar subjected to a Heaviside step loading in time which is applied uniformly over the end. This elastic solution agrees with other numerical solutions and with asymptotic series solutions. An elastic specimen is used to verify the split-Hopkinson pressure bar numerical analysis and a numerical solution is also obtained for an elastic-plastic specimen. Special emphasis is placed on the two-dimensional response of the specimen including the sliding between the bars and the specimen with two extremes of interface friction. For large interface friction it is found that induced multidimensional stresses give the appearance of increased material strength which may be misconstrued as a strain-rate effect.

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Analysis of the Impact of the Frequency Range of the Tensometer Bridge and Projectile Geometry on the Results of Measurements by the Split Hopkinson Pressure Bar Method

Metrology and Measurement Systems ◽

10.2478/mms-2013-0047 ◽

2013 ◽

Vol 20 (4) ◽

pp. 555-564 ◽

Cited By ~ 12

Author(s):

Wojciech Moćko

Keyword(s):

Test Bench ◽

Split Hopkinson Pressure Bar ◽

Dynamic Deformation ◽

Spectral Width ◽

Hopkinson Pressure Bar ◽

Computing Environment ◽

Split Hopkinson ◽

Pressure Bar ◽

The Impact ◽

Bench Model

Abstract The paper presents the results of the analysis of the striker shape impact on the shape of the mechanical elastic wave generated in the Hopkinson bar. The influence of the tensometer amplifier bandwidth on the stress-strain characteristics obtained in this method was analyzed too. For the purposes of analyzing under the computing environment ABAQUS / Explicit the test bench model was created, and then the analysis of the process of dynamic deformation of the specimen with specific mechanical parameters was carried out. Based on those tests, it was found that the geometry of the end of the striker has an effect on the form of the loading wave and the spectral width of the signal of that wave. Reduction of the striker end diameter reduces unwanted oscillations, however, adversely affects the time of strain rate stabilization. It was determined for the assumed test bench configuration that a tensometric measurement system with a bandwidth equal to 50 kHz is sufficient

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