Fracture modelling of a high performance armour steel

Skoglund, Peter; Nilsson, Martin; Tjernberg, A.

doi:10.1051/jp4:2006134030

Cited by 20 publications

(14 citation statements)

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“…First off all, the material description should be modeled accurately to exhibit realistic behavior during penetration. A list of J-C parameters for armor materials is tabulated in Section 2.1 [12,[22][23][24]. Using the parameters found, the stressstrain curves at 1250 s À1 strain rate are visualized in Fig12a.…”

Section: Resultsmentioning

confidence: 99%

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Ballistic resistance of high hardness armor steels against 7.62mm armor piercing ammunition

2013

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Section: Resultsmentioning

confidence: 99%

“…One of the studies about Armox 500 manufactured by SSAB (mechanical properties are close to armor used in this study) has been performed by Skoglund and Nilsson [22,23]. They have found that A = 1470 MPa, B = 702 MPa, n = 0.199, c = 0.00549 and m = 0.811.…”

Section: Armor Platesmentioning

confidence: 96%

Ballistic resistance of high hardness armor steels against 7.62mm armor piercing ammunition

2013

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“…[9], [24] and [26]. However, the temperature parameter D 5 in the MJC failure strain equation is taken equal to zero without performing any tests.…”

Section: Armour Platesmentioning

confidence: 99%

“…Previous studies [3,9,10,[24][25][26] show that the Johnson-Cook (JC) constitutive relation and Johnson-Cook (JC) fracture criterion with five material parameters give reliable results of the perforation problem. However, for design purposes, it is crucial that the number of material tests in numerical Unauthenticated Download Date | 5/12/18 10:15 PM simulations is minimized, since it is both costly and ineffective to perform a number of material tests each time a new material is considered.…”

Section: Introductionmentioning

confidence: 99%

On the Influence of Fracture Criterion on Perforation of High-Strength Steel Plates Subjected to Armour Piercing Projectile

Tria

Trȩbiński

2015

Archive of Mechanical Engineering

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This paper presents a numerical investigation of fracture criterion influence on perforation of high-strength 30PM steel plates subjected to 7.62×51 mm Armour Piercing (AP) projectile. An evaluation of four ductile fracture models is performed to identify the most suitable fracture criterion. Included in the paper is the Modified Johnson-Cook (MJC) constitutive model coupled separately with one of these fracture criteria: the MJC fracture model, the Cockcroft-Latham (CL), the maximum shear stress and the constant failure strain models. A 3D explicit Lagrangian algorithm that includes both elements and particles, is used in this study to automatically convert distorted elements into meshless particles during the course of the computation. Numerical simulations are examined by comparing with the experimental results. The MJC fracture model formulated in the space of the stress triaxiality and the equivalent plastic strain to fracture were found capable of predicting the realistic fracture patterns and at the same time the correct projectile residual velocities. However, this study has shown that CL one parameter fracture criterion where only one simple material test is required for calibration is found to give good results as the MJC failure criterion. The maximum shear stress fracture criterion fails to capture the shear plugging failure and material fracture properties cannot be fully characterized with the constant fracture strain.

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“…The stress-strain curves of Armox 500T alloy derived from the J-C flow stress model parameters reported in Refs. [29,30] and the stress-strain curves of Secure 500 alloy derived from the J-C flow stress model parameters reported in Ref. [31] are shown for comparison.…”

Section: Materials and Testingmentioning

confidence: 99%

Ballistic behavior of high hardness perforated armor plates against 7.62mm armor piercing projectile

et al. 2014

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a b s t r a c tIn this paper, some of the important defeating mechanisms of the high hardness perforated plates against 7.62 Â 54 armor piercing ammunition were investigated. The experimental and numerical results identified three defeating mechanisms effective on perforated armor plates which are the asymmetric forces deviates the bullet from its incident trajectory, the bullet core fracture and the bullet core nose erosion. The initial tests were performed on the monolithic armor plates of 9 and 20 mm thickness to verify the fidelity of the simulation and material model parameters. The stochastic nature of the ballistic tests on perforated armor plates was analyzed based on the bullet impact zone with respect to holes. Various scenarios including without and with bullet failure models were further investigated to determine the mechanisms of the bullet failure. The agreement between numerical and experimental results had significantly increased with including the bullet failure criterion and the bullet nose erosion threshold into the simulation. As shown in results, good agreement between Ls-Dyna simulations and experimental data was achieved and the defeating mechanism of perforated plates was clearly demonstrated.

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Fracture modelling of a high performance armour steel

Cited by 20 publications

References 0 publications

Ballistic resistance of high hardness armor steels against 7.62mm armor piercing ammunition

Ballistic resistance of high hardness armor steels against 7.62mm armor piercing ammunition

On the Influence of Fracture Criterion on Perforation of High-Strength Steel Plates Subjected to Armour Piercing Projectile

Ballistic behavior of high hardness perforated armor plates against 7.62mm armor piercing projectile

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