Comparison of Porter-Gould Constitutive Model With Compression Test Data for Htpb∕sugar

Cornish, R.; Porter, David; Church, P.; Gould, Peter; Andrews, T.; Proud, B.; Drodge, Daniel; Siviour, C.R.

doi:10.1063/1.2833239

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…where the strain rate is constant and the value of in this research was fixed using the simple relation = ∞ /3 ( ∞ is the long-term rubbery modulus, obtained also from the results of the DMA experiment). A strain activated damage model [1,18] was incorporated to this basic framework to allow the behaviour of the composites to be predicted. The damage is expressed as is a function of the input mechanical energy, , and its effect on the mechanical response is modelled is using the following expression:…”

Section: Modelling Frameworkmentioning

confidence: 99%

Predicting the high strain rate behaviour of particulate composites using time-temperature superposition based modelling

Trivedi

Siviour

2021

EPJ Web Conf.

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Polymeric particulate composites are widely used in engineering systems where they are subjected to impact loading – at a variety of temperatures – leading to high strain rate deformation. These materials are highly rate and temperature dependent, and this dependence must be well understood for effective design. It is not uncommon for many of these materials to display mechanical responses that range from glassy and brittle to rubbery and hyperelastic [1-3], due to their polymeric constituents. This makes accurate measurements and modelling not only necessary, but challenging. This is made more difficult by experimental artefacts present when traditional tools such as the split Hopkinson pressure (SHPB) or Kolsky bar are used to interrogate the high rate response of low-impedance materials. The transition from isothermal to adiabatic conditions as the rate of deformation increases also has an effect on the mechanical response, which cannot be neglected if the high rate behaviour is to be accurately predicted. In this paper, time-temperature superposition based frameworks that have enabled the high rate behaviour of neoprene rubber [4] and (plasticised) poly(vinyl chloride) [5] to be captured, will be extended to explore the high strain rate behaviour of unfilled natural rubber and several grades of glass microsphere filled natural rubber particulate composites.

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Section: Modelling Frameworkmentioning

confidence: 99%

Predicting the high strain rate behaviour of particulate composites using time-temperature superposition based modelling

Trivedi

Siviour

2021

EPJ Web Conf.

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“…The compression data was fitted to the physically-based Porter-Gould composite model [2] for use with the QinetiQ version of DYNA 3D. A SESAME-format equation of state was predicted from the properties of the components in DPX2 [3] without reference to data using methods based on Group Interaction Modelling [4].…”

Section: Numerical Simulationmentioning

confidence: 99%

Development of a constitutive model for DPX2 explosive

2018

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There is a significant challenge in simulating the behaviour of PBXs under high strain rate impact loading. A Porter-Gould physically based constitutive model has been developed for the DPX2 explosive. A series of quasi-static compression and tensile tests over a range of temperatures were performed together with DMA tests to calibrate the model. In particular tests were performed for different L/D ratios to understand the complex localisation and damage behaviour of the material. High rate tests on the compression Split Hopkinson Pressure Bar (SHPB) for a range of temperatures were then used for validation of the model under idealised stress states. Some model development is still required, particularly at lower temperatures near the glass transition temperature. In addition a series of classical Taylor Tests were used to validate the model under impact loading conditions at room temperature. The DYNA3D simulations gave very good results compared to the experiments for these impact conditions.

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“…Extensive studies have been devoted to investigating the mechanisms of hot spot formation in explosives and propellants, including particle crushing, interparticle friction, viscous shear flow friction and pore collapse. [30][31][32][33][34][35][36][37][38][39]. However, direct visualization of the mechanical damage and the ignition to deflagration or detonation of propellant under impact loading is still underexplored [40,41].…”

Section: Introductionmentioning

confidence: 99%

Low/intermediate speed impact‐induced ignition and damage of a novel high‐energy solid propellant

Chen

et al. 2023

Propellants Explo Pyrotec

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The damage and ignition response of a novel propellant is investigated using a modified split Hopkinson pressure bar (SHPB). The mechanical response of the propellant exhibits strong strain rate dependency following a power law. The whole process from mechanical damage to onset of ignition, deflagration and potential deflagration to detonation transition (DDT) under different strain rates (1000–5000 s−1) is captured via high‐speed photography and digital image correlation (DIC). To clarify the onset and extent of the resulting reaction in terms of the mechanical damage caused by impact, meso‐scale analysis is used to evaluate the propellant before and after dynamic impact loading. The ignition response under impact loading is mainly caused by shear flow, and ignition after multiple impacts due to the reflection of stress waves. Dense debris clouds produced by the first impact are observed in the case of a strain rate of 5000 s−1 leading to DDT when the second impact initiated ignition.

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Comparison of Porter-Gould Constitutive Model With Compression Test Data for Htpb∕sugar

Cited by 7 publications

References 3 publications

Predicting the high strain rate behaviour of particulate composites using time-temperature superposition based modelling

Predicting the high strain rate behaviour of particulate composites using time-temperature superposition based modelling

Development of a constitutive model for DPX2 explosive

Low/intermediate speed impact‐induced ignition and damage of a novel high‐energy solid propellant

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