Vibro-Acoustic Behaviour of a Damaged Honeycomb Core

2021 ◽  
pp. 105-120
Author(s):  
Mehmet Yetmez ◽  
Oguzhan Sen ◽  
Cagrihan Celebi
Keyword(s):  
Honeycomb Core ◽  
Acoustic Behaviour

First Record of the Bush-Cricket Isophya Harzi (Orthoptera: Phaneropteridae) Outside its Locus Typicus

2012 ◽  
Vol 55 (2) ◽  
pp. 201-206 ◽  
Author(s):  
Ionuţ Ştefan Iorgu ◽  
Alexandru Ioan Tatu ◽  
Elena Iulia Iorgu
Keyword(s):  
First Record ◽  
Acoustic Behaviour ◽  
Bioacoustic Analysis ◽  
The Subject ◽  
Locus Typicus ◽  
Bush Cricket

Abstract During the period 2008-2012, the bush-cricket Isophya harzi Kis, 1960 has been the subject of several collecting trips in Cozia Mountains, where it was believed to be endemic, in order to study its acoustic behaviour. However, on a recent trip to Piatra Craiului Mountains, to study its Orthoptera fauna, I. harzi was surprisingly found in clearings and mountain steppe slopes covered with tall subalpine vegetation from Northern and Western areas. Bioacoustic analysis and some ecological notes are presented in the paper.

scholarly journals Acoustic behaviour of 3D printed titanium perforated panels

2021 ◽  
pp. 100252
Author(s):  
Arun Arjunan ◽  
Ahmad Baroutaji ◽  
Ahmad Latif
Keyword(s):  
Acoustic Behaviour ◽  
3D Printed

Acoustic behaviour of 3D printed bio-degradable micro-perforated panels with varying perforation cross-sections

2021 ◽  
Vol 174 ◽  
pp. 107769
Author(s):  
R. Sailesh ◽  
L. Yuvaraj ◽  
Jeyaraj Pitchaimani ◽  
Mrityunjay Doddamani ◽  
Lenin Babu Mailan Chinnapandi
Keyword(s):  
Cross Sections ◽  
Acoustic Behaviour ◽  
3D Printed

Quasi-static mechanical properties of novel generalized Resch-pattern composite foldcores

2020 ◽  
pp. 095440622094000
Author(s):  
Antao Deng ◽  
Bin Ji ◽  
Xiang Zhou
Keyword(s):  
Mechanical Properties ◽  
Design Method ◽  
Absorption Capacity ◽  
Woven Fabrics ◽  
Geometric Design ◽  
Honeycomb Core ◽  
Reinforced Plastic ◽  
Static Mechanical ◽  
Laminate Thickness ◽  
Static Mechanical Properties

A new geometric design method for foldcores based on the generalized Resch patterns that allow face-to-face bonding interfaces between the core and the skins is proposed. Based on the geometric design method, a systematic numerical investigation on the quasi-static mechanical properties of the generalized Resch-based foldcores made of carbon fiber-reinforced plastic (CFRP) woven fabrics subjected to compression and shear loads is performed using the finite element method that is validated by experiments. The relationships between the mechanical properties and various geometric parameters as well as laminate thickness of the generalized Resch-based CFRP foldcores are revealed. Additionally, the mechanical properties of the generalized Resch-based CFRP foldcore are compared to those of the standard Resch-based, Miura-based foldcore, the honeycomb core, and the aluminum counterpart. It is found that the generalized Resch-based CFRP foldcore performs more stably than the honeycomb core under compression and has higher compressive and shear stiffnesses than the standard Resch-based and Miura-based foldcores and absorbs as nearly twice energy under compression as the Miura-based foldcore does. When compared with the aluminum counterpart, the CFRP model has higher weight-specific stiffness and strength but lower energy absorption capacity under shearing. The results presented in this paper can serve as the useful guideline for the design of the generalized Resch-based composite foldcore sandwich structures for various performance goals.

Influence of Honeycomb Core Compression on the Mechanical Properties of the Sandwich Structure

2013 ◽  
Vol 486 ◽  
pp. 283-288
Author(s):  
Ladislav Fojtl ◽  
Soňa Rusnáková ◽  
Milan Žaludek
Keyword(s):  
Mechanical Properties ◽  
Impact Test ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Low Velocity Impact ◽  
Bending Test ◽  
Honeycomb Core ◽  
Low Velocity ◽  
Three Point Bending ◽  
Core Technology

This research paper deals with an investigation of the influence of honeycomb core compression on the mechanical properties of sandwich structures. These structures consist of prepreg facing layers and two different material types of honeycomb and are produced by modified compression molding called Crush-Core technology. Produced structures are mechanically tested in three-point bending test and subjected to low-velocity impact and Charpy impact test.

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