On the influence of fracture criterion in projectile impact of steel plates

Dey, Sumita; Børvik, Tore; Hopperstad, Odd Sture; Langseth, Magnus

doi:10.1016/j.commatsci.2006.02.003

Cited by 99 publications

(61 citation statements)

References 15 publications

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“…It was shown by e.g. Dey et al [28] and Kane et al [29] that the oneparameter CL criterion gives equally good results as more advanced failure criteria in simulations of perforation of steel plates under various stress states and projectile nose shapes.…”

Section: Constitutive Relation and Fracture Criterionmentioning

confidence: 99%

Effects of heat treatment on the ballistic properties of AA6070 aluminium alloy

Holmen

Johnsen

Jupp

et al. 2013

International Journal of Impact Engineering

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The ballistic properties of the aluminium alloy AA6070 in different tempers are studied, using target plates of 20 mm thickness in tempers O (annealed), T4 (naturally aged), T6 (peak strength) and T7 (overaged). The stressstrain behaviour of the different tempers was characterised by quasi-static tension tests and was found to vary considerably with temper in regards to strength, strain hardening and ductility. Ballistic impact tests using 7.62 mm APM2 bullets were then carried out, and the ballistic limit velocities were obtained for all tempers. In the material tests it was shown that the O-temper was most ductile and almost no fragmentation took place during the ballistic impact tests. The T6-temper proved to be least ductile, and fragmentation was commonly seen. The experiments show that despite fragmentation, strength is a more important feature than ductility in ballistic impact for this alloy, at least for the given projectile and within the velocity range investigated. A thermoelasticthermoviscoplastic constitutive relation and a ductile fracture criterion were determined for each temper, and finite element analyses were performed using the IMPETUS Afea Solver with fully integrated 3 rd -order 64-node hexahedrons. The numerical simulations predicted the same variation in ballistic limit velocity with respect to temper condition as found in the experiments, but the results were consistently to the conservative side. In addition, analytical calculations using the cylindrical cavity expansion theory (CCET) were carried out. The ballistic limit velocities resulting from these calculations were found to be in good agreement with the experimental data.

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Section: Constitutive Relation and Fracture Criterionmentioning

confidence: 99%

Effects of heat treatment on the ballistic properties of AA6070 aluminium alloy

Holmen

Johnsen

Jupp

et al. 2013

International Journal of Impact Engineering

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“…[33][34]). In this study, a tiny pinhole was introduced in the centre of the plate to avoid the need for a fracture criterion.…”

Section: Discussionmentioning

confidence: 99%

A nano-scale material model applied in finite element analysis of aluminium plates under impact loading

Johnsen

Holmen

Myhr

et al. 2013

Computational Materials Science

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Finite element simulations of AA6070 aluminium plates struck by ogival-nose projectiles are performed. The aluminium plates are 20 mm thick and heat treated to temper O, T4, T6 and T7. A nano-scale material model, consisting of three parts: a precipitation model, a yield-strength model and a work-hardening model, is used to predict the flow-stress curves of the materials at ambient temperature based on the chemical composition of the alloy and the thermal history defined by the heat treatment. Finite element simulations of the perforation process are then carried out using both 3D solid and 2D axisymmetric elements. The numerically-obtained ballistic limit velocities, predicted without any use of data from mechanical tests, are compared with available experimental data and found to be in excellent agreement with the experimental ones for all tempers. The same holds for the predicted residual velocities at striking velocities higher than the ballistic limit.

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“…Some authors claim that the magnitude of the fracture strain does not affect simulation results [21]. Thus, taking into consideration that in the course of the cutting process the material was subjected both to temperature effect and influences arising from high deformation rate, the actual failure strain value may be 1.16 to 1.75 times larger than its static equivalent [22]. For further FE analysis the value of 1.16 was considered.…”

Section: Evaluation Of Dynamic Behavior Lawmentioning

confidence: 99%