Results 191 to 200 of about 24,236 (228)

Dynamic Fracture Toughness Test Using Hopkinson Bar

2012
Various loading and measuring configurations have been developed in Hopkinson bar fracture toughness experimental techniques. It is well known that several fundamental issues, such as force equilibrium, pulse shaping, stress-wave propagation, etc., must be evaluated in order to obtain a reliable measurement.
Wei-Yang Lu, Bo Song, Kenneth Gwinn
openaire   +1 more source

An innovative electromagnetic compressive split Hopkinson bar

International Journal of Mechanics and Materials in Design, 2009
This paper proposes a new design for the compressive split Hopkinson bar that makes use of the intense pressure created in a transient magnetic field formed by the passage of a pulse of electric current through a series of coils. The proposed technology enables to characterize the behaviour of materials under high strain-rates with a small acceleration
C. M. A. Silva, P. A. R. Rosa, P. A. F. Martins   +2 more
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Discussions on Standardization of Hopkinson Bars Technique

2007
It is well known that the constitutive behaviour of most materials exhibits rate sensitivity and that the rate dependent (tensile/compressive) properties of such materials should be experimentally studied. The Split Hopkinson Bar (SHB) technique has been successfully applied to investigate the visco-elastic and visco-plastic behaviour of plastics and ...
L. M. Yang, Li Song, Li-Li Wang
openaire   +1 more source

Strain Measuring System for Hopkinson Pressure Bar

2007 8th International Conference on Electronic Measurement and Instruments, 2007
A combination mode of host computer and slave computer is adopted by strain measuring system for Hopkinson pressure bar. The host computer is a microcomputer mode Pentium 4 which can be used in after-processing of measurement,while the 8098 single microcomputer used by the slave computer as controller, and data acquisition consists of sensors ...
Huang Wenyun, Huang Xinmiao
openaire   +1 more source

The Origins of the Hopkinson Bar Technique

2018
Although Bertram Hopkinson had a research interest in the dynamic strengths of materials, the bar technique he published in 1914 was developed to roughly determine the shapes of stress pulses produced by bullet impact and explosions. His pressure bar proved useful to the British explosives and armour industry during the Great War allowing them to ...
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Split Hopkinson bar testing apparatus

1998
FIGURE 2 shows compression wave generation apparatus 101 to the left of split Hopkinson pressure bar 102 including input bar 103 connected via test specimen 104 to output bar 105. Compression wave 106,107 is generated by initially placing impactor bar 109 under a pre-load force by hydraulic actuator 108 (in the direction of arrow A) until fragile ...
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Wave Dispersion in Kolsky-Hopkinson Bar Machine

2018
This chapter is interested in the wave dispersion effects in Kolsky-Hopkinson bar machine. First, Section 6.2 introduces how to assess wave dispersion parameters in three-dimensional elastic and viscoelastic bars using analytical analysis. Subsequently, Sect. 6.3 introduces experimental techniques used to measure the wave dispersion.
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High strain rate compressive strength behavior of cemented paste backfill using split Hopkinson pressure bar

International Journal of Mining Science and Technology, 2021
Xin Chen, Xiuzhi Shi, Jian Zhou
exaly  

Impact Bend Tests Using Hopkinson Pressure Bars

Bend tests under impact loading have traditionally been conducted using drop weight testers. However, the force readings from drop weight testers suffer from increasing oscillation (due to load frame vibration and stress wave excitation) as the impact velocity is increased.
R.A. Govender, G.S. Langdon, G.N. Nurick
openaire   +1 more source

Split Hopkinson (Kolsky) Bar

2011
Weinong Chen, Bo Song
openaire   +1 more source