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Showing 1 to 20 of 21 for “"Split Hopkinson Pressure bar (SHPB)"”.
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Numerical investigation of dispersion in Hopkinson Pressure Bar
The Hopkinson Pressure Bar (HPB) is used as a load-time or displacement-time transducer in impact or blast 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 …
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Development and proving of a split Hopkinson pressure bar used for high strain rate materials testing
… unusable. To overcome these 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 …
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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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Finite strain behavior of polyurea for a wide range of strain rates
… (0.001/s to 10/s). Second, two 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 …
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An investigation into the characterisation of the spalling behaviour of Polycrystalline Diamond Compact(PDC) cutters under impact loading conditions
… the degree of spalling was performed 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 …
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Dynamic response of glass under low-velocity impact and high strain-rate compression loading
… drop weight impact test system, 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 …
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Morphology to Thermal-Mechanical Property Relationships of Dispersed Carbon Nanoparticle Epoxy Composites
… tension and flexure, high-rate 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 …
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Experimental study of the development of plastic solitary waves in one-dimensional granular media
In this 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 …
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Experimental study of elasto-plastic wave propagation in one-dimensional and two-dimensional disk arrays
… work, a drop-weight tower setup 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 …
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Wave propagation in one dimensional confined granular media
… were then investigated 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 …
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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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Hydraulic fracturing through 3D printing and lattice modelling
… specimens are successfully 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 …
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Microstructure, Quasi-Static, And High-Strain Rate Dynamic Characterization Of Metakaolin And Fly Ash Based Geopolymers For Structural Applications
… to their high strain rate mechanical 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 …
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High-Strain Rate Tensile Characterization Of Graphite Platelet Reinforced Vinyl Ester Based Nanocomposites Using Split-Hopkinson Pressure Bar
… tests are performed applying 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 …
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Assessing the effect of friction on compression split Hopkinson pressure bar tests
… on accurate high strain rate 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 …
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Mechanical properties of energetic composites
… A key piece of mechanical testing 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 …
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Optical spectroscopy of HMX reaction regimes
… for more quantitative measurements, 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 …
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Characterisation of Glass Fibre Polypropylene and GFPP based Fibre Metal Laminates at high strain rates
… tests were conducted on GFPP using 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 …
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Experimental study of UHPC with high fire resistance and meso-scale modelling
… effect of fire and blast, both compressive and splitting tensile split Hopkinson pressure bar (SHPB) tests were carried out under combined action of high temperatures up to 800 °C and impact loading. The dynamic tests were done both under high temperatures (hot test) and after cooling down (cool …
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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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