Analytical Model Construction of Natural Frequency for Paper Honeycomb Sandwich Plate—Block System

2018 ◽  
Author(s):  
NING LIANG ◽  
DONG-MEI WANG ◽  
YAN-FENG GUO ◽  
ZI-YOU BAI ◽  
RUI YANG
Keyword(s):  
Natural Frequency ◽  
Analytical Model ◽  
Sandwich Plate ◽  
Model Construction ◽  
Block System ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Plate ◽  
Paper Honeycomb

Analysis of energy dissipated by damping for paper honeycomb sandwich plate-block system

2019 ◽  
Vol 233 (18) ◽  
pp. 6483-6490
Author(s):  
Ning Liang ◽  
Dongmei Wang ◽  
Yanfeng Guo ◽  
Rui Yang ◽  
Qianghua Liao ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Sandwich Plate ◽  
Structural Parameters ◽  
Plateau Region ◽  
Block System ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Plate ◽  
Vibration Transmissibility ◽  
Paper Honeycomb ◽  
Energy Dissipated

The vibration transmissibility of paper honeycomb sandwich plate was tested and the vibration transmissibility curve was simplified and characterized. Based on the basic principle of vibration mechanics, the equation for calculating the energy dissipated by damping of paper honeycomb sandwich plate-block system during vibration was deduced. Furthermore, the effects of honeycomb structural parameters (cell length, sandwich plate thickness) and block mass on the damping energy dissipation were analyzed. The results showed that the curves of vibration transmissibility for paper honeycomb sandwich plate can be divided into three regions: plateau region, amplification region, and attenuation region. The vibration transmissibility ratio in different regions can be expressed as functions of frequency. The energy dissipated by damping of paper honeycomb sandwich plate-block system depends on its vibration transmissibility. If the vibration transmissibility ratio–frequency curve is obtained, the damping energy dissipation of the system can be calculated. The total energy dissipation of paper honeycomb sandwich plate-block system during vibration is about equal to that of plateau region, and the energy dissipated in amplification and attenuation region can be neglected. Different honeycomb structural parameters have the same effect on the damping energy dissipation of the system. Block mass has little effect on the damping energy dissipation in plateau region and the total energy dissipation during vibration but has a greater impact on the energy dissipation in the amplification and attenuation regions. The purpose of this paper is to provide a basic method for calculation of energy dissipated by damping and evaluation of anti-vibration property for packaging material.

Numerical Simulation of Penetration Effect of Spherical Fragment on Square Honeycomb Sandwich Plate

2011 ◽  
Vol 474-476 ◽  
pp. 1869-1873 ◽  
Author(s):  
Tao Wang ◽  
Wen Li Yu ◽  
San Qiang Dong ◽  
Yun Liang Gao
Keyword(s):  
Oblique Incidence ◽  
Sandwich Plate ◽  
Normal Incidence ◽  
Impact Angle ◽  
Damage Effect ◽  
Penetration Effect ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Plate ◽  
Solid Plate ◽  
Active Fragment

In this paper, a spherical fragment penetrating to square honeycomb sandwich plate and solid plate which has the same mass as sandwich plate are simulated by LS-DYNA code. The fragment impacts plates at normal incidence and oblique incidence with 30º impact angle at the velocity of 300m/s, 350m/s, 380m/s, 400m/s, 450m/s and 500m/s separately. And the damage pattern of sandwich plate, the acceleration of fragment and the energy absorption of sandwich plate are acquired. For sandwich plate, the acceleration of fragment is less than that of solid plate and the internal energy absorbed is larger that that of solid plate. The result can be used to design new active fragment to improve the damage effect to sandwich plate.

Hypernormal Form at Cubic of Honeycomb Sandwich Plate Dynamics Model

2013 ◽  
Vol 437 ◽  
pp. 81-84 ◽  
Author(s):  
Xin Li ◽  
Jing Li ◽  
Bin He
Keyword(s):  
Normal Form ◽  
Sandwich Plate ◽  
Multiple Scales ◽  
Method Of Multiple Scales ◽  
Dynamics Model ◽  
Average Equation ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Plate ◽  
Lie Brackets ◽  
Plate Dynamics

Honeycomb sandwich plate have been widly applied in industry design in recent years. In this paper, we study the cubic hypernormal form (the simplest normal form and the unique normal form) for honeycomb sandwich plate dynamics model with the help of Maple symbolic computation. Firstly, we get the average equation of four dimensional cartesian form by using the method of multiple scales perturbation analysis. Based on the method combined new grading function with multiple Lie brackets, we obtain the hypernormal form of cubic truncated. The results will further enrich the research for dynamics of honeycomb sandwich plate model, and is also the basis for higher order normal form research.

Numerical Simulation of Penetration Effect of the Rhombic Fragment on Square Honeycomb Sandwich Plate

2012 ◽  
Vol 466-467 ◽  
pp. 347-351
Author(s):  
Tao Wang ◽  
Wen Li Yu ◽  
San Qiang Dong ◽  
Yun Liang Gao
Keyword(s):  
Numerical Simulation ◽  
Dynamic Response ◽  
Energy Loss ◽  
Oblique Incidence ◽  
Sandwich Plate ◽  
Impact Angle ◽  
Penetration Effect ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Plate ◽  
Movement Rules

In this paper, the penetration effect of a rhombic fragment penetrating sandwich in an oblique incidence with 30º impact angle at the velocity of 300 m•s-1, 350 m•s-1, 400 m•s-1, 450 m•s-1, 500 m•s-1 and 600 m•s-1 is simulated by LS-DYNA. The dynamic response and the damage patterns of sandwich plate and the movement rules of the rhombic fragment are acquired. The ratio of energy loss and the maximum resultant acceleration of the rhombic fragment are compared with that of the spherical respectively.

Damage Patterns of the Hexagonal Aluminum Honeycomb Sandwich Plate Subjected to Fragment Impact

2012 ◽  
Vol 463-464 ◽  
pp. 364-368
Author(s):  
Tao Wang ◽  
Fang Li ◽  
Wen Li Yu ◽  
Jin Tao Wang ◽  
Tuo Wang
Keyword(s):  
Energy Loss ◽  
Sandwich Plate ◽  
Oblique Impact ◽  
Loss Ratio ◽  
Peak Point ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Plate ◽  
The Face ◽  
Aluminum Honeycomb ◽  
Different Shapes

In this paper, the damage patterns of the hexagonal aluminum honeycomb sandwich plate subjected to normal and oblique impact by spherical, cylindrical and cubic fragments at different velocities are simulated using LS-DYNA code. The damage patterns of the sandwich plate and the energy loss ratio of fragment are acquired. In normal and oblique impact for different shapes of the fragment, the damage patterns of the sandwich plate include the plastic deformation, the fracture and the perforation of the face sheet and the tearing of the core or the combination of them. The curve of energy loss ratio waves with the velocity of fragment. And the peak point at the curve of energy loss ratio versus the velocity of fragment denotes the limit velocity of fragment. Furthermore, the energy loss ratios of fragments in oblique impact at the velocity of 500 m•s-1 with the angle of impact of 5°, 10°, 15° and 20° are obtained. The results denote that a fragment with large ratio of length to diameter is easy to perforate the sandwich plate both in normal and oblique impact.

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