A Study on the Influencing Factors of Deformation Control of Deformable Warheads

2012 ◽  
Vol 452-453 ◽  
pp. 160-164
Author(s):  
Ya Dong Yang ◽  
Xiang Dong Li ◽  
Yuan Zhang ◽  
Shi Yong Qin
Keyword(s):  
Phase Angle ◽  
Three Dimensional ◽  
Influence Factors ◽  
Chord Length ◽  
Time Interval ◽  
Control Parameters ◽  
Deformation Control ◽  
Dimensional Finite Element ◽  
Deformation Processes ◽  
Three Dimensional Finite Element

The deformation processes of a deformable warhead was numerically simulated using LS-DYNA three-dimensional finite element code to determine the influence factors of deformation control on the deformation quality. The relationships among optimal deformation time interval, deformation chord length, and deformation control parameters were established. The result shows that the phase angle of deforming charge should be taken within the range of 60–90°. a larger deforming charge phase angle is favorable when it comes to increasing the fragment density in the target direction. Meanwhile, the thickness of deforming charge is less important than the phase angle in terms of the influence of the deformation chord-length.

Post-construction settlement estimation and increased earthwork volumes calculation of high loess fill

2016 ◽  
Vol 3 (1) ◽  
pp. 43-55
Author(s):  
Cai-Hui Zhu
Keyword(s):  
Empirical Equation ◽  
Three Dimensional ◽  
Influence Factors ◽  
In Situ Tests ◽  
Construction Time ◽  
Dimensional Finite Element ◽  
History Of ◽  
Three Dimensional Finite Element ◽  
Airport Runway ◽  
Fill Depth

In this study, the post-construction settlement (PCS) area distribution of high fill was analyzed based with reference to a case history of an airport runway crossing a deep gully reclaimed by a thick fill of loess. Earthwork volumes (EV) attributed to PCS was calculated based on in-situ tests. Results showed that the uneven PCS were related to fill depth, construction time, fill rate, integrated compaction degree, and boundary conditions. An empirical equation that considers the aforementioned influence factors was established to calculate the final PCS of high fill. The surface PCS of high fill and the EV can be estimated according to the proposed empirical equation and the original site topography using the three-dimensional finite element method.

scholarly journals Investigation of Influence Factors of Wind-Induced Buffeting Response of a Six-Tower Cable-Stayed Bridge

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Zhi-Qiang Zhang ◽  
You-Liang Ding ◽  
Fang-Fang Geng
Keyword(s):  
Bridge Deck ◽  
Three Dimensional ◽  
Influence Factors ◽  
Element Model ◽  
Buffeting Response ◽  
Cable Stayed Bridge ◽  
Longitudinal Stiffness ◽  
Dimensional Finite Element ◽  
The Difference ◽  
Three Dimensional Finite Element

This paper presents an investigation of the wind-induced buffeting responses of the Jiashao Bridge, the longest multispan cable-stayed bridge in the world. A three-dimensional finite element model for the Jiashao Bridge is established using the commercial software package ANSYS and a 3D fluctuating wind field is simulated for both bridge deck and towers. A time-domain procedure for analyzing buffeting responses of the bridge is implemented in ANSYS with the aeroelastic effect included. The characteristics of buffeting responses of the six-tower cable-stayed bridge are studied in some detail, focusing on the effects including the difference in the longitudinal stiffness between the side towers and central towers, partially longitudinal constraints between the bridge deck and part of bridge towers, self-excited aerodynamic forces, and the rigid hinge installed in the middle of the bridge deck. The analytical results can provide valuable references for wind-resistant design of multispan cable-stayed bridges in the future.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

Tire Modeling by Finite Elements

1992 ◽  
Vol 20 (1) ◽  
pp. 33-56 ◽  
Author(s):  
L. O. Faria ◽  
J. T. Oden ◽  
B. Yavari ◽  
W. W. Tworzydlo ◽  
J. M. Bass ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Rolling Contact ◽  
Test Problems ◽  
State Behavior ◽  
Normal Contact ◽  
New Developments ◽  
Applied Torque ◽  
Dimensional Finite Element ◽  
Tire Modeling ◽  
Three Dimensional Finite Element

Abstract Recent advances in the development of a general three-dimensional finite element methodology for modeling large deformation steady state behavior of tire structures is presented. The new developments outlined here include the extension of the material modeling capabilities to include viscoelastic materials and a generalization of the formulation of the rolling contact problem to include special nonlinear constraints. These constraints include normal contact load, applied torque, and constant pressure-volume. Several new test problems and examples of tire analysis are presented.

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