Effect of structure defects distribution on the fragmentation spectrum in the simulation of explosive destruction of thick-walled cylindrical shells

Пашков, С. В.; Зелепугин, С. А.; Yanov, D V

doi:10.1063/1.5132137

Cited by 1 publication

(1 citation statement)

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“…Penetration of thin targets from ductile materials, as a rule, is accompanied by petalisation, in spite of the initial symmetry of the task, the edges of the hole turn out to be torn and have the shape of bent ‘petals’. 22 The number of ‘petals’ depends on the impact velocity and the strength material characteristics. Despite uniform and symmetrical loading, in reality, localisation of strains on structural inhomogeneities begins very quickly.…”

Section: The Probabilistic Nature Of Fracture During Penetration Of T...mentioning

confidence: 99%

Probabilistic approach in modelling dynamic fracture problems

Пашков

Зелепугин

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The paper represents a probabilistic approach to the finite element modelling of dynamic fracture problems. It is proposed to model internal structural defects and inhomogeneities using the spatial distribution of strength characteristics according to the normal distribution law. The probabilistic approach to modelling dynamic fracture is provided by the introduction of one additional parameter – the dispersion in the distribution of strength material properties. This approach provides the probabilistic nature to the initiation and development of cracks in the material at any scale level: macro, meso and micro level. There are no restrictions on the size of computational mesh and elements, the fracture criterion and the material models to apply this approach. The probabilistic approach is also applicable to multilevel modelling using the appropriate distribution of inhomogeneities. This approach does not require a detailed study of the material structure, which enhances the predictive nature of computations. The numerical results of exploding cylinder tests and the penetration of thin targets by a projectile are presented. Numerical results are in good qualitative and quantitative agreement with experimental data.

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Section: The Probabilistic Nature Of Fracture During Penetration Of T...mentioning

confidence: 99%