Practical aspects of numerical simulations of dynamic events: effects of meshing

Zukas, Jonas A.; Scheffler, Daniel R.

doi:10.1016/s0734-743x(00)00012-9

Cited by 85 publications

(39 citation statements)

References 14 publications

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“…These can lead to unreliable results or unnecessary large and nonefficient models on the other hand. As reported in Zukas and Scheffler (2000), given the same task of air blast loaded silo door, four users provided quite different results (reaching even 80% difference among each other) for maximum displacement. Therefore, special care should be given on the most influential numerical parameters in order achieve betters uniqueness and deliver proper loading to the structure while keeping the model cost effective.…”

Section: Introductionmentioning

confidence: 56%

Minimum mesh design criteria for blast wave development and structural response - MMALE method

Trajkovski

Kunc

Perenda

et al. 2014

Lat. Am. j. solids struct.

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The Multi Material Arbitrary Lagrange Euler (MMALE) method is widely used method for numerical investigation of structural response under blast loading. However the method is very demanding for use at the other hand. In this paper are presented the results of the detailed numerical investigation in order to simplify some decisions contributing to the accuracy and efficiency of this model. The influence of mesh properties (particularly mesh size, its biasing and distance of the boundary (DoB) conditions from the deforming structure) on blast wave loading parameters and structural response is investigated in detail and based on the results minimum mesh design criteria is proposed. The results obtained are presented as a function of the scaled distance and additionally related to the radius of the charge. Validation studies were also done successfully.

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Section: Introductionmentioning

confidence: 56%

Minimum mesh design criteria for blast wave development and structural response - MMALE method

Trajkovski

Kunc

Perenda

et al. 2014

Lat. Am. j. solids struct.

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“…The stability of the results and its mesh size dependence were previously checked [8,24]. The aspect ratio of elements was maintained close to unity as recommended by Zukas and Scheffler [32]. A convergence study using a linear hexahedral element in the impact zone with the initial size 0.2 x y z mm       ensures the stability of the numerical solution without mesh sensitivity effect and with optimal time computation.…”

Section: Description Of the Numerical Modelmentioning

confidence: 99%

Effect of projectile nose shape on ballistic resistance of interstitial-free steel sheets

Kpenyigba

Jankowiak²,

Rusinek³

et al. 2015

International Journal of Impact Engineering

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In this paper an experimental and numerical work is reported concerning the process of perforation of thin steel plates using different projectile nose shapes. The main goal is to analyze how the projectile shape may change the ballistic properties of materials. A wide range of impact velocities from 35 to 180 m/s has been covered during the tests. All the projectiles were 13mm in diameter and the targets were 1mm thick, as such the projectile can be regarded as rigid and the target sheets were of interstitial-free (IF) steel. The mass ratio (projectile mass/steel sheet mass) and the ratio between the span of the steel sheet and the diameter of the projectile were kept constant, equal to 0.38 and 3.85 respectively. To define the thermoviscoplastic behaviour of the target material, the Rusinek-Klepaczko (RK) constitutive model [1] was used. The complete identification of the material constants was done based on a rigorous material characterization. Numerical simulations of some experimental tests were carried out using a non-linear finite element code ABAQUS/Explicit. It was found that the numerical models are able to describe the physical mechanisms in the perforation process with a good accuracy.

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“…The integral viscoelastic approach available in ABAQUS/Explicit has been used to prevent hourglass deformation modes; the scale factor used for all hourglass stiffnesses was chosen equal to one. According to the considerations reported by Zukas and Scheffer (2000) the active part of the specimen has been meshed using elements whose aspect ratio was close to 1:1:1 (%1 Â 1 Â 1 mm 3 ) ( Fig. 4 b); this leads to an average integra tion time step Dt % 9 10 8 s.…”

Section: Identification Of the Materials Parameters Involved In Simt Kmentioning

confidence: 99%

A constitutive model for analyzing martensite formation in austenitic steels deforming at high strain rates

Zaera

Rodríguez-Martínez

Casado³

et al. 2012

International Journal of Plasticity

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a b s t r a c tThis study presents a constitutive model for steels exhibiting SIMT, based on previous sem inal works, and the corresponding methodology to estimate their parameters. The model includes temperature effects in the phase transformation kinetics, and in the softening of each solid phase through the use of a homogenization technique. The model was validated with experimental results of dynamic tensile tests on AISI 304 sheet steel specimens, and their predictions correlate well with the experimental evidence in terms of macroscopic stress strain curves and martensite volume fraction formed at high strain rates. The work shows the value of considering temperature effects in the modeling of metastable austen itic steels submitted to impact conditions. Regarding most of the works reported in the lit erature on SIMT, modeling of the martensitic transformation at high strain rates is the distinctive feature of the present paper.

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Practical aspects of numerical simulations of dynamic events: effects of meshing

Cited by 85 publications

References 14 publications

Minimum mesh design criteria for blast wave development and structural response - MMALE method

Minimum mesh design criteria for blast wave development and structural response - MMALE method

Effect of projectile nose shape on ballistic resistance of interstitial-free steel sheets

A constitutive model for analyzing martensite formation in austenitic steels deforming at high strain rates

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