Numerical Simulation of High Velocity Impact with SPH Frictionless Contact Algorithm

2010 ◽  
Vol 44-47 ◽  
pp. 1787-1791
Author(s):  
Zhi Chun Zhang ◽  
Hong Fu Qiang ◽  
Wei Ran Gao
Keyword(s):  
High Velocity ◽  
Material Model ◽  
Damage Effect ◽  
Neighborhood Search ◽  
High Velocity Impact ◽  
Frictionless Contact ◽  
Velocity Impact ◽  
Contact Algorithm ◽  
To Come ◽  
Cylindrical Steel

The continuity velocity algorithm is widely used in SPH for high velocity impact simulation, but there is some error when calculating the separation between projectile and target. This paper adopts SPH frictionless contact algorithm to handle the contact problem in high velocity impact, and the perforation of a cylindrical steel projectile impacting a plate target is simulated in 3D. The corrected Johnson-Cook material model with damage effect and Gruneisen equation of state are adopted for the target. The SPH frictionless contact algorithm checks interpenetration between projectile and target using SPH neighborhood search, and contact force is enforced for contact particles. The comparisons between numerical simulations and experimental observations show that the SPH frictionless contact algorithm allow projectile and target to come together and separate in a physically correct manner.

Failure Analysis of Hybrid Armor Under High Velocity Impact

2000 ◽  
Author(s):  
Hassan Mahfuz ◽  
Yuehui Zhu ◽  
Wahid A. Mamun ◽  
Anwarul Haque ◽  
Shaik Jeelani
Keyword(s):  
Failure Analysis ◽  
High Velocity ◽  
Material Model ◽  
Fe Model ◽  
High Velocity Impact ◽  
Depth Of Penetration ◽  
Velocity Impact ◽  
Rubber Layer ◽  
Gas Gun ◽  
Set Up

Abstract Failure analysis of hybrid integral armor has been performed using finite element method. LS-DYNA3D code has been employed to investigate the response of an integral armor under high velocity impact. A 3-D FE model consisting of the various layers of the armor has been developed and subjected to transient dynamic loading. The analysis is based on actual experiments conducted in a gas gun set up. V50 velocity for a Fragment Simulating Projectile (FSP) has been considered, and the corresponding responses have been investigated to assess the failure of the armor at the ballistic limit. The investigation consisted of three successive studies; first, a base model was developed to have preliminary ideas about the energy absorption and the depth of penetration. Second, interface gap elements were introduced at the rubber interfaces, as the delamination across the rubber layer seemed critical in the failure of the armor. Third, a user defined material model has been introduced to account for the fracture behavior of ceramic. Details of the development of the models, and the analysis of failure are presented in this paper.

A multi-stage material model calibration procedure for enhancing numerical solution fidelity in the case of impact loading of composites

2020 ◽  
Vol 55 (1) ◽  
pp. 39-56
Author(s):  
Efthimios Giannaros ◽  
Athanasios Kotzakolios ◽  
George Sotiriadis ◽  
Vassilis Kostopoulos
Keyword(s):  
High Velocity ◽  
Compressive Load ◽  
Material Model ◽  
Parameter Determination ◽  
Model Parameters ◽  
Computational Error ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Compression Loading ◽  
Percentage Difference

The numerical prediction of impact-induced damage to composite materials and the subsequent residual strength under compression loading continue to be a challenging task. The current study proposes a calibration routine for optimizing the set of material model parameters prior to the virtual simulation of impact tests, which also simplifies the process of parameter determination. The calibration algorithm is based on the comparison of the numerical force-strain or force-displacement curves with the corresponding experimental ones to get the optimal input data, and it includes basic quasi-static material characterization tests. For the sake of simplicity, the calibration process was divided into two parts. The first part includes the in-plane loading tests (tension 0° & 90°, compression 0° & 90°, shear and open-hole tension) for calibration of orthotropic damage material model; whereas the second one consists of the mode I and mode II interlaminar fracture tests as well as the short beam shear test, and it mainly targets to the adjustment of cohesive model parameters. Given the optimal set of parameters of material models, low and high velocity impact simulations at the energy level of 30 J were carried-out to LS-DYNA software and compared with experiments. The percentage difference between numerical and experimental delamination area, after the calibration enablement, reduced from 77% and 60% to 10% and 25% for low- and high-velocity impact, respectively. Afterwards, the damaged specimens were experimentally and virtually tested to compression loading. In terms of maximum compressive load, the computational error is close to 1% for both impact conditions.

High Velocity Impact Modelling of Sandwich Panels with Aluminium Foam Core and Aluminium Sheet Skins

2014 ◽  
Vol 553 ◽  
pp. 745-750 ◽  
Author(s):  
Cheng Jun Liu ◽  
Yi Xia Zhang ◽  
Qing Hua Qin ◽  
Rikard Heslehurst
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
High Velocity ◽  
Sandwich Panels ◽  
Material Model ◽  
Element Model ◽  
Aluminium Foam ◽  
Foam Core ◽  
High Velocity Impact ◽  
Velocity Impact

A finite element model is developed in this paper to simulate the perforation of aluminium foam sandwich panels subjected to high velocity impact using the commercial finite element analysis software LS-DYNA. The aluminum foam core is governed by the material model of crushable foam materials, while both aluminium alloy face sheets are modeled with the simplified Johnson-Cook material model. A non-linear cohesive contact model is employed to simulate failure between adjacent layers, and an erosion contact model is used to define contact between bullets and panels. All components in the model are meshed with 3D solid element SOLID 164. The developed finite element model is used to simulate the dynamic response of an aluminium foam sandwich panel subjected to projectile impact at velocity ranging from 76 m/s to 187m/s. The relationship between initial velocity and exit velocity of the projectile obtained from numerical modelling agrees well with that obtained from experimental study, demonstrating the effectiveness of the developed finite element model in simulating perforation of sandwich panels subjected to high velocity impact.

Effect of strain rate, off-axis loading and high-velocity impact damage on the compressive strength of C/SiC composite

2018 ◽  
Vol 53 (4) ◽  
pp. 535-546 ◽  
Author(s):  
M Altaf ◽  
S Singh ◽  
VV Bhanu Prasad ◽  
Manish Patel
Keyword(s):  
Compressive Strength ◽  
Strain Rate ◽  
High Velocity ◽  
Impact Damage ◽  
The Other ◽  
High Velocity Impact ◽  
Fibre Bundles ◽  
Velocity Impact ◽  
Kink Bands ◽  
Other Hand

The compressive strength of C/SiC composite at different strain rates, off-axis orientations and after high-velocity impact was studied. The compressive strength was found to be 137 ± 23, 130 ± 46 and 162 ± 33 MPa at a strain rate of 3.3 × 10−5, 3.3 × 10−3, 3.3 × 10−3 s−1, respectively. On the other hand, the compressive strength was found to be 130 ± 46, 99 ± 23 and 87 ± 9 MPa for 0°/90°, 30°/60° and 45°/45° fibre orientations to loading direction, respectively. After high-velocity impact, the residual compressive strength of C/SiC composite was found to be 58 ± 26, 44 ± 18 and 36 ± 3.5 MPa after impact with 100, 150 and 190 m/s, respectively. The formation of kink bands in fibre bundles was found to be dominant micro-mechanism for compressive failure of C/SiC composite for 0°/90° orientation. On the other hand, delamination and the fibre bundles rotation were found to be the dominant mechanism for off-axis failure of composite.

scholarly journals Analysis of High Velocity Impact on Hybrid Composite Fan Blades

1980 ◽  
Vol 17 (10) ◽  
pp. 763-766 ◽  
Author(s):  
C. C. Chamis ◽  
J. H. Sinclair
Keyword(s):  
Hybrid Composite ◽  
High Velocity ◽  
High Velocity Impact ◽  
Velocity Impact

Apparatus for investigating the effects of high-velocity impact on polymers

1972 ◽  
Vol 5 (5) ◽  
pp. 812-813
Author(s):  
V. V. Kovriga ◽  
V. N. Chalidze
Keyword(s):  
High Velocity ◽  
High Velocity Impact ◽  
Velocity Impact
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