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Showing 1 to 20 of 27 for “"SHPB"”.
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Development and proving of a split Hopkinson pressure bar used for high strain rate materials testing
… limitations the split Hopkinson pressure bar (SHPB) was developed. A SHPB facility was developed at UCT to measure material properties at high strain rates. The development, discussed in this thesis, included the design and manufacturing of a SHPB, strain gauge amplifiers and a data acquisition …
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Assessing the effect of friction on compression split Hopkinson pressure bar tests
… material data. A Split Hopkinson Pressure Bar (SHPB) facility had previously been developed at the University of Cape Town to allow high strain rate testing of materials in compression. However, uncertainties regarding aspects of the test method that can affect the accuracy of the results, such …
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Dynamic response of glass under low-velocity impact and high strain-rate compression loading
… and a modified Split Hopkinson Pressure Bar (SHPB). In the low-velocity punch-shear experiment, similar trend has been observed for all glass types, and Starphire and Borosilicate demonstrated the highest total energy absorption. High strain-rate SHPB compression tests were carried out on …
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A system for high strain rate interruptible tensile tests
The Split Hopkinson Pressure Bar (SHPB) is a widely used piece of equipment used for measuring a material's response to high strain rates. High strain rate data is critical for exhaustive characterisation, due to the sensitivity of materials to the rate at which they are strained. The principle …
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High-Strain Rate Tensile Characterization Of Graphite Platelet Reinforced Vinyl Ester Based Nanocomposites Using Split-Hopkinson Pressure Bar
… the reverse impact Split Hopkinson Pressure Bar (SHPB) technique. The specimen geometry for tensile test is parametrically optimized by Finite Element Analysis (FEA) using ANSYS Mechanical APDL®. Uniform stress distribution within the specimen gage length has been verified using high-speed digital …
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Numerical investigation of dispersion in Hopkinson Pressure Bar
… experiments. The Split Hopkinson Pressure Bar (SHPB) is the accepted form of material testing for strain rates between 102 S-I and 104 S-I. Explicit Finite Element Analysis (FEA) codes are increasingly used to model HPB experiments numerically, due to the complicated boundary conditions imposed …
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Mechanical properties of energetic composites
… apparatus, the Split Hopkinson Pressure Bar (SHPB), is critically assessed in chapters 2 and 3. The gauge calibration procedure was critically evaluated; the necessity of dispersion correction was investigated; and a method for allowing for the finite specimen transit time was introduced. …
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Experimental study of elasto-plastic wave propagation in one-dimensional and two-dimensional disk arrays
… and a modified split Hopkinson pressure bar (SHPB) are used to dynamically load one- (1D) and two-dimensional (2D) arrays of disks in contact. The disks are made of aluminum 6061 T6 and are selected because of their rate-independence, thus allowing static contact force-displacement laws to be …
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An Optical Method of Strain Measurement in the Split Hopkinson Pressure Bar
The split Hopkinson pressure bar (SHPB) continues to be one of the most common methods of testing materials at medium rates of strain. Elevated rates of strain, such as those found in impact and explosive applications, have been shown to induce phenomena such as strain hardening and phase …
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Finite strain behavior of polyurea for a wide range of strain rates
… distinct gas-gun split Hopkinson pressure bar [SHPB] systems are employed to cover high strain rates: a nylon bar system (700/s to 1200/s) and an aluminum bar system (2300/s to 3700/s). Lastly, the rate-sensitivity for intermediate strain rates (10/s to 1000/s) is characterized using a modified …
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An investigation into the characterisation of the spalling behaviour of Polycrystalline Diamond Compact(PDC) cutters under impact loading conditions
… using the split-Hopkinson pressure bar (SHPB) apparatus. The PDC cutters were loaded under specific impact conditions and their reactions monitored and characterised. In order to isolate and identify the mechanism responsible for the spalling of the PDC cutters required them to be tested …
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Development and applications of new peridynamic models
… propagations in split Hopkinson's pressure bar (SHPB) and was validated by the experiment results. The peridynamic model was then used for designing required shapers in SHPB application and greatly improves the experiment efficiency. Secondly, a two-dimensional model was proposed and verified by …
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Experimental study of the development of plastic solitary waves in one-dimensional granular media
… work, a modified split Hopkinson pressure bar (SHPB) is used to impact one-dimensional granular chain of spheres. These homogeneous chains used here comprise of brass, aluminum, or stainless steel spherical beads, ranging from a single sphere to a chain of fourteen, and are of interest because …
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Microstructure, Quasi-Static, And High-Strain Rate Dynamic Characterization Of Metakaolin And Fly Ash Based Geopolymers For Structural Applications
… behavior. A Split-Hopkinson Pressure Bar (SHPB) was utilized to determine the high-strain rate compressive properties of both pure Metakaolin and Class F fly ash geopolymers with sand as fine aggregate. SHPB compressive data for Metakaolin and Class F Fly ash-based mortar along with a …
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High strain rate mechanical characterization of trabecular bone utilizing the split-Hopkinson pressure bar technique
The split-Hopkinson pressure bar (SHPB) technique has been in use in one form or another for more than fifty years and has recently gained a great deal of attention for its ability to characterize materials such as metals, plastics, and even stiff foams at strain rates of up to 105 sec-1. …
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Morphology to Thermal-Mechanical Property Relationships of Dispersed Carbon Nanoparticle Epoxy Composites
… compression via Split Hopkinson Pressure Bar (SHPB), and viscoelastic property evaluation using dynamic mechanical analysis (DMA). Thermal performance was assessed through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC).</p> <p>Results showed that 0.1 wt% GNP …
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Wave propagation in one dimensional confined granular media
… using a modified Split Hopkinson Pressure bar (SHPB). Although a dependence on granular chain length was seen, it was found that confinement does not significantly affect the primary pulse caused by the solitary wave as it passes through the chain, at least for chains exceeding 5-6 grains in …
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Hydraulic fracturing through 3D printing and lattice modelling
… fractured by the split Hopkinson pressure bar (SHPB) system for investigating the dynamic crack propagation and coalescence. In addition to the high accuracy and flexibility in specimen preparation, the desired fracture paths captured by the high-speed camera affirm the suitability of the …
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Optical spectroscopy of HMX reaction regimes
… and the Split Hopkinson Pressure Bar (SHPB) was used for the first time to purposely initiate deflagration, providing better measurements of the energy present during initiation. Using the greybody emission, the temperatures of these reactions were measured as 3900 ± 400 K and 2900 ± …
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Characterisation of Glass Fibre Polypropylene and GFPP based Fibre Metal Laminates at high strain rates
… a compressive Split Hopkinson Pressure Bar (SHPB) and a Direct Impact Hopkinson Pressure Bar (DIHPB), in the through-thickness and in-plane directions. In both loading directions, the peak stress of GFPP increased linearly with the logarithm of strain rate. For in-plane loading, the failure …
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