scholarly journals Mechanical behavior of sandwich structure composites for helicopters

2020 ◽  
Vol 12 (4) ◽  
pp. 155-162
Author(s):  
George PELIN ◽  
Cristina-Elisabeta PELIN ◽  
Adriana STEFAN ◽  
Alexandra PETRE ◽  
Alina DRAGOMIRESCU
Keyword(s):  
Mechanical Behavior ◽  
Composite Structure ◽  
Weight Ratio ◽  
High Strength ◽  
Mechanical Tests ◽  
Impact Behavior ◽  
Sandwich Composite ◽  
Maximum Efficiency ◽  
Commercial Aircraft ◽  
Sandwich Composite Structure

The visible part of the floors of a commercial aircraft has long been a standard issue for virtually every commercial aircraft, mainly due to the weight of the materials from which they were made. Floor parts must provide mechanical strength and dimensional stability, while keeping the weight of the aircraft as low as possible for maximum efficiency. The design of the 787 Dreamliner and the Airbus A380 aircraft brought new opportunities in the use of the sandwich composite structure, mainly due to their light weight and high strength-to-weight ratio. Thus, this paper investigates the mechanical behavior of sandwich composite panels composed of two sides of carbon fiber laminate and Nomex honeycomb core obtained in the autoclave and developed under the RoRCraft CompAct grant. The technical approaches of this work are mainly focused on the compression behavior and especially on the compression after impact behavior of the hybrid sandwich composite structure, for defining and obtaining an optimal structure for the floors. These mechanical tests are decisive for such materials and have been performed in accordance with international ASTM standards.

scholarly journals Analysing the mechanical behavior of A6061/SiC/B4C/Flyash composite fabricated through stir casting

2018 ◽  
Vol 7 (2.8) ◽  
pp. 424
Author(s):  
N Subramani ◽  
R Krishnan
Keyword(s):  
Mechanical Behavior ◽  
Experimental Studies ◽  
Weight Ratio ◽  
High Strength ◽  
Stir Casting ◽  
Mechanical Tests ◽  
Nano Composite ◽  
Reinforcement Distribution ◽  
Particulate Reinforced ◽  
Carbide Particles

Alloys of Aluminium are prominently used in automobiles, aerospace and ship building industries because of their high strength to weight ratio. The aim of this work is to manufacture the particulate reinforced metal matrix composite (PRMMC) materials by using Aluminium 6061 and reinforcing Boron Carbide, particles of silicon and fly ash. The study helps to fabricate an optimized composite material through the best methodology which is identified at the end of the experimental studies which is going to be carried out. This study helps the current researches carried on the nano-composite materials and PRMMC. In this paper, the Aluminium 6061 and its reinforcements are discussed and it gives a methodology to select the optimized method. The specimens fabricated by stir casting are analyzed and categorized according to their mechanical behavior by conducting mechanical tests. The Micro-structure of the specimen is examined by scanning electron microscopy (SEM) and spectrum analysis is done to the reinforcement distribution percentage.

Study on Sandwich Core Modeling for Structural Analysis of Sandwich Composite Structure

2018 ◽  
Vol 926 ◽  
pp. 57-63
Author(s):  
Hyun Bum Park
Keyword(s):  
Structural Analysis ◽  
Composite Structure ◽  
Solid Modeling ◽  
Modeling Method ◽  
Core Structure ◽  
Sandwich Composite ◽  
Damage Area ◽  
The Core ◽  
Sandwich Core ◽  
Sandwich Composite Structure

This study aims to investigate numerically the damage area of a sandwich composite structure. In this work, the optimal sandwich core modeling method was proposed. This study applied two modeling methods to compare their analysis results for the structural analysis of the sandwich composite structure. Firstly, the modeling of sandwich core structure was performed with laminate modeling method. Secondly, the modeling of core structure was performed with core solid modeling method. The laminate modeling method was compared with the core solid modeling method. For the modeling, a carbon/epoxy composite structure was applied to the face sheet. And a nomex honeycomb core was applied to the core. Finally, comparing the result of modeling as actual shape with the one of virtually applying the thickness and modeling, it was examined that the former had three times more stress than the latter.

scholarly journals Defect Detection in Aerospace Sandwich Composite Panels Using Conductive Thermography and Contact Sensors

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6689
Author(s):  
David I. Gillespie ◽  
Andrew W. Hamilton ◽  
Robert C. Atkinson ◽  
Xavier Bellekens ◽  
Craig Michie ◽  
...  
Keyword(s):  
Impact Damage ◽  
Primary Repair ◽  
Single Point ◽  
Weight Ratio ◽  
Sandwich Composite ◽  
Thermal Stimulus ◽  
Honeycomb Core ◽  
Commercial Aircraft ◽  
Common Structure ◽  
Carbon Fibre Reinforced Polymer

Sandwich panels consisting of two Carbon Fibre Reinforced Polymer (CFRP) outer skins and an aluminium honeycomb core are a common structure of surfaces on commercial aircraft due to the beneficial strength–weight ratio. Mechanical defects such as a crushed honeycomb core, dis-bonds and delaminations in the outer skins and in the core occur routinely under normal use and are repaired during aerospace Maintenance, Repair and Overhaul (MRO) processes. Current practices rely heavily on manual inspection where it is possible minor defects are not identified prior to primary repair and are only addressed after initial repairs intensify the defects due to thermal expansion during high temperature curing. This paper reports on the development and characterisation of a technique based on conductive thermography implemented using an array of single point temperature sensors mounted on one surface of the panel and the concomitant induced thermal profile generated by a thermal stimulus on the opposing surface to identify such defects. Defects are classified by analysing the differential conduction of thermal energy profiles across the surface of the panel. Results indicate that crushed core and impact damage are detectable using a stepped temperature profile of 80 ∘C The method is amenable to integration within the existing drying cycle stage and reduces the costs of executing the overall process in terms of time-to-repair and manual effort.

scholarly journals Steel-Concrete Sandwich Composite Structure

1992 ◽  
Vol 30 (5) ◽  
pp. 5-20 ◽  
Author(s):  
Tamon Ueda ◽  
Toshiyuki Shioya
Keyword(s):  
Composite Structure ◽  
Sandwich Composite ◽  
Sandwich Composite Structure
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