A Study of the effect of aspect ratio on fragmentation of explosively driven cylinders

Vuyst, Tom De; Vignjević, Rade; Campbell, J.; Klavzar, Andreas; Seidl, Marina

doi:10.1016/j.proeng.2017.09.773

Cited by 6 publications

(14 citation statements)

References 9 publications

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“…These observations suggest that small rotations should be included in the simulation. The work by De Vuyst et al 23 looks promising and a suggested partitioning of the casing's surface, as shown in Figure 17, is worth investigating.…”

Section: Are Fragments Grouped In the Simulation?mentioning

confidence: 99%

“…This indicates this paper's simulation produces witness plates that are not totally inaccurate. Including fragment small rotations and dividing the length of the casing into smaller lengths, as shown by De Vuyst et al, 23 would make the simulation more realistic. The simulation also can be improved by changing the ''*'' impacts into impact craters that depend on the known width of fragments.…”

Section: Are Fragments Grouped In the Simulation?mentioning

confidence: 99%

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Real-time simulation of a fragmenting explosion for cylindrical warheads

Felix

Colwill

Harris

2021

Journal of Defense Modeling & Simulation

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Explosion models based on finite element analysis (FEA) can be used to simulate how a warhead fragments. However, their execution times are extensive. Active protection systems need to make very fast predictions, before a fast attacking weapon hits the target. Fast execution times are also needed in real-time simulations where the impact of many different computer models is being assessed. Hence, FEA explosion models are not appropriate for these real-time systems. As a trade-off between accuracy and execution time, this paper creates a simulation of fragments from a warhead’s explosion, using simple analytical equations. The results are verified against explosion experimental data and FEA results. The developed model then can be made available for real-time simulation and fast computation.

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Section: Are Fragments Grouped In the Simulation?mentioning

confidence: 99%

Section: Are Fragments Grouped In the Simulation?mentioning

confidence: 99%

Real-time simulation of a fragmenting explosion for cylindrical warheads

Felix

Colwill

Harris

2021

Journal of Defense Modeling & Simulation

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“…The experiments for our study have been conducted at ISL and published by De Vuyst et al [ 21 ]. Furthermore, ref.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, ref. [ 21 ] presents numerical results for this application. The main drawbacks of the model are the description of circumferential cracks and the fragment mass distribution for the smallest ring size.…”

Section: Introductionmentioning

confidence: 99%

“…Section 4 illustrates the application and the results obtained with the improved numerical model. This model gives a better description of qualitative aspects compared to the original model [ 21 ]. e.g., the fragment mass distribution matches better for all ring sizes and the second fragment layer for larger ring sizes, observed in the experiments, is predicted by our model.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study on High Strain Rate Fracture Modelling Using the Application of Explosively Driven Cylinder Rings

et al. 2021

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The effect of different constitutive modelling choices is crucial under a high strain rate as encountered in ballistic applications. Natural fragmentation of explosively driven cylinder rings is chosen as a simplified example to describe the ability of numerical simulations to describe fractures. The main research interests are the importance of (i) material imperfections, (ii) the accuracy of fracture models vs. damage models, (iii) the plasticity algorithm (stress update), (iv) the introduction of a triaxiality cutoff criterion to the damage models, and (v) different constitutive models (plasticity and damage). Due to the complexity of the propagation and coalescense of multiple cracks in classical methods, smoothed-particle hydrodynamics (SPH) is used as a tailor-made method to discretise the model. An elasto-plasticity model, a damage model and an equation of state describe the material behaviour. The required material parameters are determined based on stress–strain curves from quasi-static and dynamic tests. The Johnson–Cook model, with and without a modification of the strain rate term, and the Rusinek–Klepaczko model are used to describe plasticity. These plasticity models are combined either with the Johnson–Cook, the Lemaitre, or the Dolinski–Rittel damage model and the Mie–Grüneisen equation of state. The numerical results show that (i) a random distribution of initial damage increases irregularity of cracks, and gives more realistic fragment shapes, (ii) a coupling of plasticity model and fracture criterion has only a small effect on the fracture behaviour, (iii) using an iterative plasticity solver has a positive effect on the fracture behaviour, although this effect is marginal, (iv) adding a triaxiality cutoff criterion to the damage models improves the predicted fragment masses in the numerical simulations significantly, and (v) good accordance between experiments and numerical simulations are found for the Dolinski–Rittel and Lemaitre damage model with both plasticity models.

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