Quantification of projection angle in fragment generator warhead

Dhote, K.D.; Murthy, K. P. S.; Rajan, K. M.; Sucheendran, Mahesh M.

doi:10.1016/j.dt.2014.05.001

Cited by 9 publications

(10 citation statements)

References 1 publication

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“…Next, we will talk about the new definition of the deflecting angle proposed in this paper. The performance of fragmentation structures is usually described with characteristics of the fragment dispersion and includes mass, ejection angle, direction angle, velocity, and the distribution density of fragments [22][23][24][25]. The ejection angle ( ) and direction angle (Ω), shown in Figure 11, are studied widely in designing fragmentation structures.…”

Section: End Effectsmentioning

confidence: 99%

Parallel Control to Fragments of a Cylindrical Structure Driven by Explosive inside

Chen¹,

Li²,

Lu³

et al. 2015

Mathematical Problems in Engineering

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By analyzing the fragmentation distributions of a cylindrical structure and a specific structure, the necessity of parallel control to the fragments is presented. The shell shape of structures has an influence on the fragment spatial distribution. A new design method for the shell shape is proposed. To facilitate the establishment of the numerical model and the machining for relative experiments, the mathematical description of the theoretical calculated generatrix of the shell is simplified. The fragment spraying processes of the designed structures are simulated, and end effects are analyzed. Based on the theoretical design and plentiful simulation data, the relationships between the size of the parallel fragmentation structure and the optimized curvature radius of the shell are expressed by an equation. The equation is validated by numerical means and can be a reliable reference to the design of the parallel fragmentation structure.

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Section: End Effectsmentioning

confidence: 99%

Parallel Control to Fragments of a Cylindrical Structure Driven by Explosive inside

Chen¹,

Li²,

Lu³

et al. 2015

Mathematical Problems in Engineering

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“…These preformed fragments are propelled by a missile system which detonates at close proximity of a target, so that the fragments impact on the target surface at a very high velocity and cause maximum damage. Experimental study on FGW with spherical and cubical fragments impacting at ultra-ordnance velocity range is available in literature (Dhote et al, 2014& Dhote et al, 2015. This paper deals with the numerical study of impact dynamics of the spherical fragments in the velocity range from ordnance to hypervelocity.…”

Section: Table 1 Impact Velocity Regimesmentioning

confidence: 99%

Numerical Investigation of Penetration Characteristics of Preformed Spherical Fragments at Hyper Velocity

Mulabagal¹,

Kumaraswamy²,

Saxena³

2021

JER is an international, peer-reviewed journal that publishes f

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Numerical investigation of penetration characteristics of 6mm SS304 preformed spherical fragments released from a Fragment Generator Warhead (FGW) impacting on Steel 1006 target plate of 1 mm, 3 mm and 6 mm thick in velocity range 1000 m/s to 5000 m/s and impact angle between 0° and 75°, has been carried out using the explicit code LS-Dyna which is predominantly used for solving impact problems. The simulation model employs a strain rate dependent plasticity model viz. Johnson-Cook model supplemented by Gruneisen Equation of State (EoS), to capture the large strain encountered in target plate due to impact of a spherical fragment at high velocities. The simulation model results are presented in terms of crater diameter on the target plate normalised over original fragment diameter. Empirical equations are available in literature to estimate the normalised crater diameter under the same impact conditions employed in simulation models. The simulation model results have been validated with experimental data available in literature and also found to be in good agreement with the results obtained from empirical equations. The effectiveness of the erosion contact algorithm over Smoothed Particle Hydrodynamics (SPH) method in LS-Dyna to reasonably predict the behaviour of the target material at high velocities of impact is demonstrated in the current study.

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“…The fragment projection angle depends on its radial position on the disc. Dhote et al (2014Dhote et al ( , 2016 have conducted systematic experiments, where each fragment projection angle is traced back to its originating position on the disc. Based on their study, it was concluded that the projection angle increases gradually for the fragments laid on the central area within 0.7 times of the explosive charge diameter.…”

Section: Fragment Generator Warheadmentioning

confidence: 99%

“…For the missile warheads, the dispersion is assumed to follow a normal distribution with standard deviation of 3 (Anon, 1964), wherein the report does not elaborate details of warhead configuration and test methods. However, the systematic study with various configurations of FGW led to a conclusion that the dispersion in fragment projection angle follows normal distribution with standard deviation of 0.75 (Dhote et al, 2014(Dhote et al, , 2016. The knowledge of fragment dispersion is essentially required to assess the number of fragments that can impact on target and kill probability estimations for vulnerability/lethality code.…”

Section: Introductionmentioning

confidence: 99%

“…This paper emphasises the importance of dispersion quantification. The dispersion in fragment projection angle follows normal distribution, which is a function of mean projection angle and standard deviation (Dhote et al, 2014(Dhote et al, , 2016. The effect of dispersion on fragment hit density and target kill probability are analysed for a directional FGW.…”

Section: Introductionmentioning

confidence: 99%

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Effect of fragment dispersion on damage assessment of a directional fragment generator

Dhote

Deodhar

2017

International Journal of Damage Mechanics

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Effective neutralisation of an offensive target missile can be accomplished by a defensive missile system carrying a potential kill mechanism. A directional fragment generator warhead is one of the kill mechanisms for such an application. It projects fragments in a designed beam angle. Few researchers have attempted to quantify fragment dispersion on explosion, which revealed that the fragment projection angle follows a normal distribution with wide range in standard deviation value of 0.75° and 3°. In this paper, an attempt has been made to analyse the importance of knowing the standard deviation value for assessing damage in terms of fragment hit density and kill probability. By altering the standard deviation value between 0 and 3°, the fragment spray distribution for the fragment generator warhead is generated and compared with the distribution that corresponds to a standard deviation value of 0.75°. It is observed that the hit density variation varies by −51% to 40% from the actual. On comparing the effect of standard deviation on kill probability, it is observed that it depends on the proportionate area of vulnerable component in the fragment beam. For the vulnerable area of 0.5 times (50%) of annular fragment beam area, more than or equal to eight fragments can achieve kill probability close to 1. However, for vulnerable area of 0.02 (2%) and 0.1 times (10%) of annular fragment beam area, the kill probability depends on standard deviation value.

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Quantification of projection angle in fragment generator warhead

Cited by 9 publications

References 1 publication

Parallel Control to Fragments of a Cylindrical Structure Driven by Explosive inside

Parallel Control to Fragments of a Cylindrical Structure Driven by Explosive inside

Numerical Investigation of Penetration Characteristics of Preformed Spherical Fragments at Hyper Velocity

Effect of fragment dispersion on damage assessment of a directional fragment generator

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