Dynamic Response of Soil Under S.H.P.B. Loading

1995 ◽  
Author(s):  
J. F. Semblat ◽  
G. Gary ◽  
M. P. Luong
Keyword(s):  
Grain Size ◽  
Dynamic Response ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Testing ◽  
Three Dimensional ◽  
Hopkinson Pressure Bar ◽  
Promising Tool ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Deviatoric Stresses

Abstract Soil dynamic response has been little investigated under fast loading conditions. Split Hopkinson Pressure Bar method leads to the determination of dynamic behaviour of various materials. A special experimental device called three-dimensional S.H.P.B provides dynamic response of soil specimens in both axial and radial directions (oedometric tests). Comparisons with other loading paths (mean and deviatoric stresses) give usefull elements on granular soil behaviour under high strain rates. The results are also analysed at grain-size scale (grain-size distribution, fracture energy). Experimental results show that 3D-Split Hopkinson Pressure Bar is a promising tool for laboratory dynamic testing on soils.

Can a three-dimensional composite really provide better mechanical performance compared to two-dimensional composite under compressive loading?

2018 ◽  
Vol 38 (2) ◽  
pp. 49-61 ◽  
Author(s):  
M Tarfaoui ◽  
M Nachtane
Keyword(s):  
Mechanical Performance ◽  
Split Hopkinson Pressure Bar ◽  
Compressive Loading ◽  
Three Dimensional ◽  
Woven Composites ◽  
Two Dimensional ◽  
Hopkinson Pressure Bar ◽  
Out Of Plane ◽  
Split Hopkinson ◽  
Pressure Bar

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.

Dynamic Response and Fracture of High Strength Boride/Alumina Ceramic Composite

2006 ◽  
Vol 326-328 ◽  
pp. 1573-1576
Author(s):  
Dong Feng Cao ◽  
Li Sheng Liu ◽  
Jiang Tao Zhang
Keyword(s):  
Dynamic Response ◽  
Ceramic Composite ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Compression ◽  
High Strength ◽  
Alumina Ceramic ◽  
Hopkinson Pressure Bar ◽  
Dynamic Loadings ◽  
Split Hopkinson ◽  
Pressure Bar

Dynamic response and fracture of high strength boride/alumina ceramic composite were investigated by split Hopkinson pressure bar (SHPB) experiment in this paper. The compressive stress–strain curves and dynamic compression strength of the composites were tested. The surface’s microstructure of fractured composites were examined by using scanning electron microscope (SEM) to investigate the fracture mechanism. The results show that boride/alumina has high dynamic compressive strength and high Young’s modulus. The main fracture mode of the material is the fracture of the ceramic grains. The micro-voids and flaws, generated during the sintering and manufacturing of material and mechanical process of specimen, decrease the strength of the material because they provide the source of crack expansion when the material undergoes the dynamic loadings.

scholarly journals INSTRUMENTATION OF SPLIT HOPKINSON PRESSURE BAR FOR TESTING OF CELLULAR METALLIC MATERIALS

2018 ◽  
Vol 18 ◽  
pp. 10
Author(s):  
Jan Falta ◽  
Petr Zlámal ◽  
Marcel Adorna
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Dynamic Testing ◽  
Mechanical Impedance ◽  
Measurement Unit ◽  
Metallic Materials ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Control And Synchronization ◽  
Pressure Bar ◽  
User Interference

This paper presents an overview of the custom design instrumentation of a Split Hopkinson Pressure Bar modified for dynamic testing of materials with low mechanical impedance, particularly for cellular metallic materials (e. g. metal foams, laser sintered structures). Design and implementation of the components related to the strain wave measurement based on strain gauges (i.e. strain-gauge measurement unit, power supply unit, filtration) and the components used for the control and synchronization of the experiment, such as module of laser trough-beam photoelectric sensor are summarized in the paper. Aside from the design of the hardware components, the contribution deals also with development of a control software with graphical user interference using LabView (National Instruments, USA) programming environment, that allows selection of parameters of the dynamic tests and their storage for the evaluation of experiments.

scholarly journals Dynamic Behavior of Aluminum Alloy Aw 5005 Undergoing Interfacial Friction and Specimen Configuration in Split Hopkinson Pressure Bar System at High Strain Rates and Temperatures

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4614 ◽  
Author(s):  
Amine Bendarma ◽  
Tomasz Jankowiak ◽  
Alexis Rusinek ◽  
Tomasz Lodygowski ◽  
Bin Jia ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Split Hopkinson Pressure Bar ◽  
Strain Rates ◽  
Compression Tests ◽  
Hopkinson Pressure Bar ◽  
Element Analysis ◽  
Wide Range ◽  
Temperature Experiment ◽  
Split Hopkinson ◽  
Pressure Bar

In this paper, experimental and numerical results of an aluminum alloy’s mechanical behavior are discussed. Over a wide range of strain rates (10−4 s−1 ≤ έ ≤ 103 s−1) the influence of the loading impact, velocity and temperature on the dynamic response of the material was analyzed. The interface friction effect on the material’s dynamic response is examined using a split Hopkinson pressure bar (SHPB) in a high temperature experiment using finite element analysis (FEA). The effect of different friction conditions between the specimen and the transmitted/incident bars in the SHPB system was examined using cylinder bulk specimens and cylinder plates defined with four-layer configurations. The results of these tests alongside the presented numerical simulations allow a better understanding of the phenomenon and reduces (minimizes) errors during compression tests at high and low strain rates with temperatures ranging from 21 to 300 °C.

scholarly journals The dynamic compressive behavior of beryllium bearing bulk metallic glasses

1996 ◽  
Vol 11 (2) ◽  
pp. 503-511 ◽  
Author(s):  
H. A. Bruck ◽  
A. J. Rosakis ◽  
W. L. Johnson
Keyword(s):  
Metallic Glass ◽  
High Speed ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Testing ◽  
Adiabatic Heating ◽  
Nominal Composition ◽  
Hopkinson Pressure Bar ◽  
Thermal Detector ◽  
Split Hopkinson ◽  
Pressure Bar

In 1993, a new beryllium bearing bulk metallic glass with the nominal composition Zr41.25Ti13.75Cu12.5Ni10Be22.5 was discovered at Caltech. This metallic glass can be cast as cylindrical rods as large as 16 mm in diameter, which permitted specimens to be fabricated with geometries suitable for dynamic testing. For the first time, the dynamic compressive yield behavior of a metallic glass was characterized at strain rates of 102 to 104/s by using the split Hopkinson pressure bar. A high-speed infrared thermal detector was also used to determine if adiabatic heating occurred during dynamic deformation of the metallic glass. From these tests it appears that the yield stress of the metallic glass is insensitive to strain rate and no adiabatic heating occurs before yielding.

scholarly journals On the study of the dynamic response in 3D additively manufactured auxetic structures

2021 ◽  
Vol 250 ◽  
pp. 06004
Author(s):  
Niklas Fjeldberg ◽  
Jesús Pernas ◽  
David Varas ◽  
Jordi Martín
Keyword(s):  
Dynamic Response ◽  
Split Hopkinson Pressure Bar ◽  
Deformation Behaviour ◽  
Experimental Tests ◽  
Hopkinson Pressure Bar ◽  
Deformation Response ◽  
Unit Cells ◽  
Auxetic Structures ◽  
Split Hopkinson ◽  
Pressure Bar

The main aim of this work is to analyse the quasi-static and the dynamic response and deformation behaviour of polymeric auxetic structures manufactured with an SLA (stereolitography) additive manufacturing technique. To this end, different experimental tests were performed using a universal servo-hydraulic instron machine and a Split Hopkinson Pressure Bar (SHPB). The study focuses on the understanding of the mechanical deformation response of the metamaterial depending on the type of load, the amount and distribution of the unit cells and the strain rate applied.

scholarly journals Size Effect in the Split Hopkinson Pressure Bar Experiment

2022 ◽  
Vol 2160 (1) ◽  
pp. 012065
Author(s):  
Hailiang Nie ◽  
Weifeng Ma ◽  
Junjie Ren ◽  
Ke Wang ◽  
Jun Cao ◽  
...  
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Dynamic Testing ◽  
Impact Resistance ◽  
Dynamic Mechanical Properties ◽  
Experimental Results ◽  
Hopkinson Pressure Bar ◽  
Practical Engineering ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
The Impact

Abstract For many structures, their service environment is very strict, and the requirements for the impact resistance of materials are very high. Therefore, the dynamic testing method has important scientific significance and application value for practical engineering. Split Hopkinson pressure bar (SHPB) is one of the most common experimental methods for obtaining dynamic mechanical properties of materials. However, there is no uniform standard for the size of the bars and specimens used in the test. Theoretically, the size has little influence on the experimental results, but it has not been proved by experiments. This paper mainly studies the influence of device/specimen sizes of split Hopkinson pressure bar through experiments, it is demonstrated that the sizes of bars and specimen have little effect on experimental results.

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