Effect of Particle Morphology, Compaction, and Confinement on the High Strain Rate Behavior of Sand

Cola, Francesco De; Pellegrino, Antonio; Glößner, C.; Penumadu, Dayakar; Petrinić, Nik

doi:10.1007/s11340-017-0331-x

Cited by 37 publications

(25 citation statements)

References 28 publications

(39 reference statements)

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“…For a detailed description of this method the reader is referred to Zhao [24]. The apparatus has been described in another publication by DeCola [25]. This design is often referred to as a Long-SHPB, or L-SHPB.…”

Section: University Of Oxford -Long-shpb With In-situ Specimen Heatingmentioning

confidence: 99%

Development and Validation of a Hopkinson Bar for Hazardous Materials

et al. 2020

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Background There are a variety of approaches that can be employed for Hopkinson bar compression testing and there is no standard procedure. Objectives A Split-Hopkinson pressure bar (SHPB) testing technique is presented which has been specifically developed for the characterisation of hazardous materials such as radioactive metals. This new SHPB technique is validated and a comparison is made with results obtained at another laboratory. Methods Compression SHPB tests are performed on identical copper specimens using the new SHPB procedures at Imperial College London and confirmatory measurements are performed using the well-established configuration at the University of Oxford. The experiments are performed at a temperature of 20 • C and 200 • C. Imperial heat the specimens externally before being inserted into the test position (ex-situ heating) and Oxford heat the specimens whilst in contact with the pressure bars (in-situ heating). For the ex-situ case, specimen temperature homogeneity is investigated both experimentally and by simulation. Results Stress-strain curves were generally consistent at both laboratories but sometimes discrepancies fell outside of the inherent measurement uncertainty range of the equipment, with differences mainly attributed to friction, loading pulse shapes and pulse alignment techniques. Small metallic specimens are found to be thermally homogenous even during contact with the pressure bars. Conclusion A newly developed Hopkinson bar for hazardous materials is shown to be effective for characterising metals under both ambient and elevated temperature conditions. Keywords Split Hopkinson bar • Non-ambient • Miniaturised • Copper • Compression • Hazardous • Comparison Background and Objectives High strain rate experimental data is required to calibrate material models which describe the behaviour of dynamic processes. Experimental data should be collected in a robust, systematic and reliable way for high confidence modelling. Quasi-static testing is well understood and controlled by ISO and ASTM test standards, and measurement uncertainty budgets have been developed, for example, National Physics Laboratory TENSTAND.

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Section: University Of Oxford -Long-shpb With In-situ Specimen Heatingmentioning

confidence: 99%

Development and Validation of a Hopkinson Bar for Hazardous Materials

et al. 2020

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“…The amplification factor is higher for the transmitted wave (SG3) as the transmitted force is typically lower in magnitude than the applied incident wave (SG1 and 2). Detail on the procedure can be found in [41]. The nominal stress applied to the specimen can be derived using the following…”

Section: Data Analysis: Deriving the Stress-displacement Responsementioning

confidence: 99%

On the rate dependent behaviour of epoxy adhesive joints: Experimental characterisation and modelling of mode I failure

Lißner

Alabort

Cui

et al. 2018

Composite Structures

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The increasing use of adhesive joints in dynamic applications require reliable measurements of the rate-dependent stress-displacement behaviour. The direct measurement of the stress-displacement curve is necessary when using cohesive models in discretised solutions of boundary value problems in solid mechanics. This paper aims to investigate the rate-dependent tensile failure of adhesive joints by using a new experimental methodology-it relies upon the combination of the stress wave propagation theory and digital image correlation methods on high speed footage to quantify the tensile stress and the dissipated energy respectively. For this purpose, the Split Hopkinson Bar methodology was employed-the experimental configuration was optimised using numerical modelling. To prove the sensitivity of our framework, two different adhesives are characterised at different loading rates: the adhesive failure strength was found to increase considerably with the strain rate, while the plastic deformation of these adhesives was reduced. The film adhesive showed superior performance over the particle toughened one. In the final part, a rate-dependent cohesive zone model is proposed, one which captures the measured behaviour and which has the potential to be used in industrial applications.

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“…A post-processing procedure, based on the method of characteristics and on D'Alambert's solution of wave equations, was used to calculate the magnitude of forward and backward travelling waves as functions of position and time. Detail on the procedure can be found in [8] where a similar setup was employed to measure the high strain rate compressive response of silica and volcanic sands [9]. EPJ Web of Conferences 183, 04012 (2018) https://doi.org/10.1051/epjconf/201818304012 DYMAT 2018 Furthermore, the specimens were heated up to 373 K and 573 K using a feedback controlled induction heating system.…”

Section: High-strain Rate Testsmentioning

confidence: 99%

Temperature and strain rate dependent mechanical response of METCO 601 aluminium-polyester abradable seal coating

et al. 2018

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Abradable coatings are utilised as sacrificial materials in low-pressure compressor casings, and in intermediate and high pressure compressors and seals. The adoption of abradable coatings allows for the clearance between compressor blades and casing to be minimised, increasing the overall efficiency of the engine. Quasi-static and dynamic experiments at different temperatures are conducted to characterise the mechanical response of a thermally-sprayed abradable seal coating. The material is composed of an aluminium continuum matrix and fairly well-dispersed polyester particles. Stress versus strain histories are measured in uniaxial tension and compression at strain rates ranging from 10-3 to 102 s-1, via non-standard experimental techniques. The material displays sensitivity to the strain rate and to the imposed temperature. The mechanical behaviour is brittle in tension while it exhibits higher strains to failure in compression. The material is characterised by a pronounced tension/compression asymmetry.

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Effect of Particle Morphology, Compaction, and Confinement on the High Strain Rate Behavior of Sand

Cited by 37 publications

References 28 publications

Development and Validation of a Hopkinson Bar for Hazardous Materials

Development and Validation of a Hopkinson Bar for Hazardous Materials

On the rate dependent behaviour of epoxy adhesive joints: Experimental characterisation and modelling of mode I failure

Temperature and strain rate dependent mechanical response of METCO 601 aluminium-polyester abradable seal coating

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