Element fracture technique for hypervelocity impact simulation

Zhang, Xiaotian; Li, Yong; Liu, Tao; Jia, Guorui

doi:10.1016/j.asr.2015.01.040

Cited by 11 publications

(3 citation statements)

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“…The distortion is inherently caused by material phase change. 11 These distorted elements are identified and eliminated from the simulation. Although the energy contained in the distorted elements is deleted and system energy loss occurs, from ''pure solid'' perspective the energy in hypervelocity impact process is not conservative because some of the materials would encounter phase change and become gas or liquid and take away some of the energy.…”

Section: Node-separation Techniquementioning

confidence: 99%

“…In this way much more elements are preserved. For more discussion about the node-separation technique and element distortion treatment please see refer to Zhang et al 11 The node-separation technique is very similar to the cohesive element technique which is widely used in the static fracture simulation. However, the cohesive element technique is hardly reported to use in the hypervelocity impact simulation.…”

Section: Node-separation Techniquementioning

confidence: 99%

“…We developed the FE fracture technique of node-separation for hypervelocity impact. 11 The node-separation FE method successfully reproduced the external bubble and the internal structure of the debris cloud generated by spherical projectile hitting the single thin wall. The node-separation technique significantly improved the debris cloud simulation ability of FE method.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of fragmentation initiation threshold for sphere impacting on thin wall at hypervelocity

Zhang

Liu

2015

Proceedings of the Institution of Mechanical Engineers, Part G:

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The sphere impacting on the thin wall is simulated with node-separation finite element method, and investigations of the projectile fragmentation initiation threshold are processed based on the numerical results. The bumper-thickness-toprojectile-diameter ratio (t/D) is found to be the main determinant of the velocity threshold. The simulation cases contain the t/D ranging from 0.008 to 0.424 and impact velocity ranging from 2 km/s to 7 km/s. The numerical results are in good agreement with the tests in sphere fragmentation initiation threshold, inner spall of the sphere, debris cloud pattern. The simulations reproduce the fragmentation initiation threshold curve that is obtained by the tests. That shows the feasibility of node-separation finite element method for hypervelocity impact simulation. The shock wave analyses show that the propagation/reflection process of shock wave in the thin wall cases is very different from that in thick wall cases. That inherently results in the different variations of the threshold in the low and high intervals of t/D. The extreme thin plate case shows that when t/D is further reduced, a thick layer of debris cloud would form at the rear of the plate. Compared to the projectile residual, the debris cloud from the plate would induce wider destruction in the inner structure.

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Section: Node-separation Techniquementioning

confidence: 99%

Section: Node-separation Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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