Effect of Soft Honeycomb Core on Flexural Vibration of Sandwich Panel

2005 ◽  
Author(s):  
Qunli Liu ◽  
Yi Zhao ◽  
Habib Eslami
Keyword(s):  
Sandwich Panel ◽  
Flexural Vibration ◽  
Honeycomb Core

Numerical modeling of high velocity impact in sandwich panels with honeycomb core and composite skin including composite progressive damage model

2018 ◽  
Vol 22 (8) ◽  
pp. 2768-2795 ◽  
Author(s):  
Meysam Khodaei ◽  
Mojtaba Haghighi-Yazdi ◽  
Majid Safarabadi
Keyword(s):  
Numerical Model ◽  
Sandwich Panel ◽  
Material Model ◽  
Absorption Capacity ◽  
Numerical Results ◽  
Ballistic Impact ◽  
Experimental Results ◽  
Ballistic Limit ◽  
Honeycomb Core ◽  
Damage Initiation

In this paper, a numerical model is developed to simulate the ballistic impact of a projectile on a sandwich panel with honeycomb core and composite skin. To this end, a suitable material model for the aluminum honeycomb core is used taking the strain-rate dependent properties into account. To validate the ballistic impact of the projectile on the honeycomb core, numerical results are compared with the experimental results available in literature and ballistic limit velocities are predicted with good accuracy. Moreover, to achieve composite skin material model, a VUMAT subroutine including damage initiation based on Hashin’s seven failure criteria and damage evolution based on MLT approach modulus degradation is used. To validate the composite material model VUMAT subroutine, the ballistic limit velocities of the projectile impact on the composite laminates are predicted similar to the numerical results presented by other researchers. Next, the numerical model of the sandwich panel ballistic impact at different velocities is compared with the available experimental results in literature, and energy absorption capacity of the sandwich panel is predicted accurately. In addition, the numerical model simulated the sandwich panel damage mechanisms in different stages similar to empirical observations. Also, the composite skin damages are investigated based on different criteria damage contours.

A Study on Relevance between Distortion of Distributed Mode Loudspeaker and Characteristic of Sound Panel

2011 ◽  
Vol 291-294 ◽  
pp. 2105-2110
Author(s):  
Liang Jin Luo
Keyword(s):  
Vibration Frequency ◽  
Sandwich Panel ◽  
Flexural Vibration ◽  
Sound Power ◽  
Impedance Matrix ◽  
Cell Ratio ◽  
Radiated Sound ◽  
Sound Sensitivity ◽  
The Relationship ◽  
Radiated Sound Power

From flat-plate flexural vibration and radiated sound power discussed the inherent relationship between panel vibration frequency of distributed mode loudspeaker and geometric parameters, impedance matrix of soundboard and studied the relationship between soundboard structure of polyester foam sandwich panel and distortion of loudspeaker. Experimental results showed that distortion increases as the cell size and compress modulus, cell ratio, cell open ratio and thickness increases, but the sound sensitivity decreases as the compress modulus increases.

Consideration about Local Compression Fatigue Strength of Honeycomb Core Sandwich Panel Using CFRP for Face Sheet

2017 ◽  
Vol 2017 (0) ◽  
pp. G0300804
Author(s):  
Yuta HARADA ◽  
Yukiyoshi KOBAYASHI ◽  
Yoshinao KISHIMOTO ◽  
Toshihisa OHTSHUKA
Keyword(s):  
Fatigue Strength ◽  
Sandwich Panel ◽  
Face Sheet ◽  
Honeycomb Core

scholarly journals Impact Property of Double Layer Honeycomb Core Sandwich Panel

2009 ◽  
Vol 75 (758) ◽  
pp. 1409-1415 ◽  
Author(s):  
Yukiyoshi KOBAYASHI ◽  
Toshihisa OHTSUKA ◽  
Masaya HIRAHARA
Keyword(s):  
Double Layer ◽  
Sandwich Panel ◽  
Impact Property ◽  
Honeycomb Core

Light-weight sandwich panel honeycomb core with hybrid carbon-glass fiber composite skin for electric vehicle application

2016 ◽  
Author(s):  
Sukmaji Indro Cahyono ◽  
Angit Widodo ◽  
Miftahul Anwar ◽  
Kuncoro Diharjo ◽  
Teguh Triyono ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Electric Vehicle ◽  
Sandwich Panel ◽  
Fiber Composite ◽  
Light Weight ◽  
Honeycomb Core ◽  
Glass Fiber Composite ◽  
Hybrid Carbon

Investigation of Core Node Separation and Crush

2010 ◽  
Vol 129-131 ◽  
pp. 164-168
Author(s):  
Fen Yu ◽  
Shi Leonard ◽  
Fei Long Yang
Keyword(s):  
High Pressure ◽  
Sandwich Panel ◽  
Historical Data ◽  
Statistic Analysis ◽  
Honeycomb Core ◽  
Core Node ◽  
Analysis Calculation ◽  
Core Thickness ◽  
Relationship Of ◽  
The Relationship

The causes of the honeycomb core node separation/core crush defects of fiberglass sandwich panel is analyzed. The porosity of skin and leakage of vacuum bag under high-pressure curing environment are identified as root causes based on the analysis of historical data and designed simulation testes, and approved by statistic analysis calculation also. The relationship of core thickness and the opportunity of the defects appearing are discovered by tests.

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