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Journal articles on the topic 'SKIN PANELS MADE'

Author: Grafiati

Published: 11 September 2023

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1

Abbasloo, Aslan, and Mohamad Reza Maheri. "On the mechanisms of modal damping in FRP/honeycomb sandwich panels." Science and Engineering of Composite Materials 25, no. 4 (2018): 649–60. http://dx.doi.org/10.1515/secm-2015-0444.

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Abstract Sandwich panels made of fibre-reinforced plastic (FRP) skins and a honeycomb core can be effectively damped through the choice of the skin and especially of the core materials. Because the core is often highly damped, a lateral deflection that causes more shearing of the core than bending of the skin increases sandwich damping. Aside from the skin and the core material properties, the shearing/bending ratio depends on a number of other, often interacting, factors, including the sandwich planar as well as transverse dimensions, the particular modal pattern in which the panel vibrates a

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2

Mironov, Viktor, Mihails Lisicins, and Irina Boiko. "Sandwich Panels Made of Perforated Metal Materials." Solid State Phenomena 320 (June 30, 2021): 155–60. http://dx.doi.org/10.4028/www.scientific.net/ssp.320.155.

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Nowadays, the growing attention has focused on the sandwich-structured composites (panels), especially on those, which are environmentally friendly. The sandwich panel is a special type of the composites made of at least three layers: a core and a skin-layer bonded to each side. The aim of this paper is to investigate the possibility of using of perforated metallic materials for producing sandwich panels for the different application in the civil engineering. By using the perforated metallic materials in combination with different core materials or by using the perforated metallic material as

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3

Fajrin, Jauhar, Ni Nyoman Kencanawati, Miko Eniarti, and Arismanto Arismanto. "Core Configuration Effect On The Flexural Behaviour Of Sandwich Panel Made Of Aluminium Skin And Sengon Wood Core." Jurnal Rekayasa Sipil (JRS-Unand) 17, no. 3 (2022): 186. http://dx.doi.org/10.25077/jrs.17.3.186-193.2021.

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Among the many choices of composite sandwich panel cores, Balsa wood is one of the main alternatives of cores made of wood. However, the availability and price of Balsa wood are quite expensive, so it needs alternatives from other types of wood such as Sengon wood. The purpose of this study was to evaluate the feasibility of Sengon wood as a core of composite sandwich panels. Three variations of the Sengon wood layout had been prepared as the core of the sandwich panels with a skin made of aluminum. All specimens, including the control specimens made of whole Sengon wood, were prepared with a

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4

Mohamad, Noridah, and Hilmi Mahdi Muhammad. "Testing of Precast Lightweight Foamed Concrete Sandwich Panel with Single and Double Symmetrical Shear Truss Connectors under Eccentric Loading." Advanced Materials Research 335-336 (September 2011): 1107–16. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.1107.

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This paper reports the structural behavior of precast lightweight foamed concrete sandwich panel, PLFP, subjected to eccentric loading. An experiment was conducted to investigate the structural performance of PLFP under this load. Two PLFP panels, PE-1 and PE-2 were cast with 2000 mm in heights, 750 mm in width and 100 mm in thickness. The thickness of the wall is actually a combination of three layers. Skin layers were cast from lightweight foamed concrete while the core layer is made of polystyrene. The skin layers were connected to each other by 9 mm steel shear truss connector which were e

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Yuen, Steeve Chung Kim, Gerald Nurick, and Misha C. du Plessis. "Response of Sandwich Panels with Tubular Cores to Blast Load." Applied Mechanics and Materials 566 (June 2014): 581–85. http://dx.doi.org/10.4028/www.scientific.net/amm.566.581.

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This paper reports on the response of cladding sandwich panels with tubular cores to uniform blast load. The panels consist of thin-walled circular tubes (38 mm in diameter) made from aluminium 6063-T6 riveted laterally between the skin plates at varying spacing arrangements to provide four different types of panels. The skin exposed to the blast load is made from DOMEX 700 Steel while the back face skin is made from mild steel. Varying charge masses of explosive (ranging from 5 g to 40 g) with a prescribed load diameter of 40mm is detonated at a stand-off distance of 200 mm to provide a “unif

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Pereira, Meyrick, Maziar Ramezani, Timotius Pasang, and Ben Withy. "Investigation of Polyurethane Bonding to Steel in Sandwich Panels." Materials Science Forum 890 (March 2017): 401–5. http://dx.doi.org/10.4028/www.scientific.net/msf.890.401.

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Sandwich panels made of thin and stiff skins, connected by a thick and soft core are widely used in load-bearing components mainly due to their high strength to weight ratio. To improve the reliability in using sandwich beams, it is necessary to understand their responses under external mechanical and environmental stimuli. This paper investigates the construction of steel-polyurethane-steel sandwich panels and their mechanical properties. Key properties of a sandwich structure are the adhesion between the skins and the sandwich material, and the load transfer from the outer skin to the inner

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Luengo, Emilio, Francisco Arriaga, Ignacio Bobadilla, and Eva Hermoso. "Mechanical Efficiency and Quality Control Preliminary Analysis of Incompletely Bonded Wood-Based Sandwich Panels." Forests 14, no. 6 (2023): 1074. http://dx.doi.org/10.3390/f14061074.

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Wood-based sandwich panels are building products composed of two skins attached to a lightweight continuous core in which at least one skin is made of wood-based products, contributing to the use of renewable forest goods. Since the connection between the skins and the core is often provided by adhesive bonding, its characteristics affect the mechanical behavior of the sandwich and, therefore, must be thoroughly assessed. Full adhesion is often considered the standard situation, although some batches of the commercial product show incompletely glued surfaces, and scarce data is available with

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Hoxha, Dashnor, Brahim Ismail, Ancuța Rotaru, David Izabel, and Thibaut Renaux. "Assessment of the Usability of Some Bio-Based Insulation Materials in Double-Skin Steel Envelopes." Sustainability 14, no. 17 (2022): 10797. http://dx.doi.org/10.3390/su141710797.

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In this paper, a double-skin steel building-demonstrator, set up using panels of five bio-based insulators and a classical mineral insulating material, is studied. The panels used in the demonstrator are made from industrially manufactured and commercialized bio-materials. To assess the suitability of these panels for use in cold formed steel envelope buildings, their advantages and/or the drawbacks (if any) of the synchronized records of temperatures, relative humidity and thermal flux of each panel are obtained using a system of continuous measurements. Data from 6 months of records in the r

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9

Grenestedt, Joachim L., and Mikael Danielsson. "Elastic-Plastic Wrinkling of Sandwich Panels With Layered Cores." Journal of Applied Mechanics 72, no. 2 (2005): 276–81. http://dx.doi.org/10.1115/1.1828063.

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Elastic-plastic wrinkling of compression loaded sandwich panels made with layered cores was studied analytically and experimentally. A core with a stiff layer near the sandwich skins can improve various properties, including wrinkling and impact strengths, with only a minor weight penalty. The 2D plane stress and plane strain bifurcation problems were solved analytically, save for a determinantal equation which was solved numerically. Experiments were performed on aluminum skin/foam core sandwich panels with different combinations of stiff and soft core materials. Good correlation between expe

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Elnasri, Ibrahim. "Impact perforation of sandwich panels with graded hollow sphere cores: Numerical and Analytical investigations." EPJ Web of Conferences 250 (2021): 02027. http://dx.doi.org/10.1051/epjconf/202125002027.

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In this study, we numerically and analytically investigate the impact perforation of sandwich panels made of 0.8 mm 2024-T3 aluminum alloy skin sheets and graded polymeric hollow sphere cores with four different gradient profiles. A suitable numerical model was conducted using the LS-DYNA code, calibrated with an inverse perforation test, instrumented with a Hopkinson bar, and validated using experimental data from the literature. Moreover, the effect of boundary conditions on the perforation resistance of the studied graded core sandwich panels was discussed. The simulation results showed tha

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Ashish R. Pawar, Dhanashree S. Ware, Sampada S. Ahirrao, Kashinath H. Munde, Ganesh E. Kondhalkar,. "Analysis of Damping of Sandwich Materials by using Free Vibrations." Mathematical Statistician and Engineering Applications 70, no. 1 (2021): 796–806. http://dx.doi.org/10.17762/msea.v70i1.2701.

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Sandwich material panel is a structure made from three layers. A low density core is inserted in between two relatively thin skin layers. This sandwich material is used to achieve excellent mechanical performance at minimal weight. Sandwich panels with polygonal cores are widely used in different structural applications such as aircraft floor panels, control surfaces, civil engineering structures and many more. The main use of these panels is to reduce weight and material usage. These panels undergo various static and dynamic loading along with thermal environment. This project is a comparativ

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SKOVAJSA, MICHAL, FRANTISEK SEDLACEK, and MARTIN MRAZEK. "DETERMINATION OF MECHANICAL PROPERTIES OF COMPOSITE SANDWICH PANEL WITH ALUMINIUM HONEYCOMB CORE." MM Science Journal 2021, no. 6 (2021): 5353–59. http://dx.doi.org/10.17973/mmsj.2021_12_2021132.

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This paper deal with comparison of mechanical properties of composite sandwich panel with aluminium honeycomb core which is determined by experimental measurement, analytic calculation and numerical simulation. The goal was to compared four composite sandwich panels. The composite sandwich panels were made of two different aluminium honeycomb cores with density 32 and 72 kg.m-3 and two different layup of skin with 4 and 5 layers. The comparison was performed on a three-point bend test with support span 400 mm. This paper confirms the possibility of a very precise design of a composite sandwich

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Komarov, V. A., and S. A. Pavlova. "Optimal design of sandwich floor panels made of high-strength composite materials considering stiffness constraints." VESTNIK of Samara University. Aerospace and Mechanical Engineering 20, no. 2 (2021): 45–52. http://dx.doi.org/10.18287/2541-7533-2021-20-2-45-52.

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The article considers the challenge of designing sandwich floor panels made of high-strength composites considering stiffness constraints. A dimensionless criterion is proposed for assessing the stiffness of floor panels. A new constraint equation determines an interrelation between geometrical parameters of composite constructions and a given criterion. A demo example and the results of designing a typical floor panel using a high-strength composite material are presented. The mass of a square meter of the structure is considered as an objective function, and the thickness of the skin and the

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Labib Adyavit, Muhammad, Larasati Irischa Ramadhani, and Steven Steven. "Kajian Material Komposit Sandwich pada Floor Panel Pesawat Terbang." Mesin 29, no. 1 (2023): 45–63. http://dx.doi.org/10.5614/mesin.2023.29.1.4.

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Sandwich composites have been used as lightweight materials in aircraft manufacturing for a long time, from balsa wood sandwich in the 1930s to honeycomb and fiber-reinforced polymers sandwich. Its characteristics are considered as a 'perfect' material for aircraft, which has high strength with low density. Sandwich composites are the common materials for aircraft floor panels. The core is usually made of Nomex or aluminum honeycomb, while the skin is made of 1 "“ 2 ply of carbon/glass fiber in epoxy resin composite. The core is usually constructed using the corrugating or expansion method, wh

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15

Epasto, Gabriella, Fabio Distefano, Hozhabr Mozafari, Emanoil Linul, and Vincenzo Crupi. "Nondestructive Evaluation of Aluminium Foam Panels Subjected to Impact Loading." Applied Sciences 11, no. 3 (2021): 1148. http://dx.doi.org/10.3390/app11031148.

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Aluminium foam sandwich structures have excellent energy absorption capacity, combined with good mechanical properties and low density. Some of the authors of this paper proposed an innovative Metallic Foam Shell protective device against flying ballast impact damage in railway axles. A closed-cell aluminium foam was chosen for the Metallic Foam Shell device. The main goal of this study was the experimental investigation of the impact responses of aluminium foam panels. Low velocity impact tests were carried out at different energies on different types of aluminium foam panels in order to inve

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16

Vavrovič, Boris. "Importance of Envelope Construction Renewal in Panel Apartment Buildings in Terms of Basic Thermal Properties." Advanced Materials Research 855 (December 2013): 97–101. http://dx.doi.org/10.4028/www.scientific.net/amr.855.97.

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Envelope constructions of panel apartment buildings in Slovakia are made up of one or more layers of external panels. They typically have one or double-skin flat roofs. Nowadays, almost all envelope constructions, that yet have not been insulated and renovated, show to have insufficient thermoisolation performances. Especially roofs seems to have unsatisfactory moisture regime facilities. The article describes fundamental thermal technical characteristics of envelope constructions (external walls and flat roofs) in panel appartment buildings in their original state and after renewal in the for

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17

Elnasri, Ibrahim, and Han Zhao. "A numerical study of the impact perforation of sandwich panels with graded hollow sphere cores." Advances in Mechanical Engineering 13, no. 4 (2021): 168781402110094. http://dx.doi.org/10.1177/16878140211009415.

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In this study, we numerically investigate the impact perforation of sandwich panels made of 0.8 mm 2024-T3 aluminum alloy skin sheets and graded polymeric hollow sphere cores with four different gradient profiles. A suitable numerical model was conducted using the LS-DYNA code, calibrated with an inverse perforation test, instrumented with a Hopkinson bar, and validated using experimental data from the literature. Moreover, the effects of quasi-static loading, landing rates, and boundary conditions on the perforation resistance of the studied graded core sandwich panels were discussed. The sim

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18

Meneghin, Ivan, Goran Ivetic, and Enrico Troiani. "Analysis of Residual Stress Effect on Fatigue Crack Propagation in Bonded Aeronautical Stiffened Panels." Materials Science Forum 681 (March 2011): 236–42. http://dx.doi.org/10.4028/www.scientific.net/msf.681.236.

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The application of adhesively bonded straps made of high-static strength materials on aeronautical stiffened panels to retard the fatigue skin crack growth is currently a topical research subject. The detrimental effect of the residual stress fields induced as a consequence of the dissimilar coefficients of thermal expansion of the skin and strap materials on the fatigue skin crack propagation was investigated. The residual stresses induced in a stiffened panel representative of a pressurized fuselage shell with titanium doublers in the middle of the stringer bays is numerically quantified for

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19

Mastali, Mohammad, Joaquim Barros, and Isabel Valente. "Structural performance of hybrid sandwich slabs under shear loading." Journal of Sandwich Structures & Materials 21, no. 3 (2017): 809–37. http://dx.doi.org/10.1177/1099636217699660.

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In a hybrid panel with glass fiber-reinforced polymer (GFRP) bottom skin and ribs, and deflection hardening cementitious composites (DHCC) top layer, it is very important to provide good shear connection between these various components in order to increase the load carrying capacity of the resulting hybrid slabs and a larger increment of deflection before the occurrence of the structural softening of this panel. The effectiveness of the proposed hybrid sandwich panels strongly depends on the performance of the shear connectors. The efficiency of indented shear connectors in improving the flex

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20

Takagi, Hitoshi, Kenya Nishimura, and Antonio N. Nakagaito. "Trial Fabrication of Carbon Fiber-Reinforced Thermoplastic Honeycomb Sandwich Materials." Key Engineering Materials 774 (August 2018): 25–30. http://dx.doi.org/10.4028/www.scientific.net/kem.774.25.

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This paper deals with a new fabrication technique of carbon fiber-reinforced thermoplastic (CFRTP) honeycomb cores and all-CFRTP honeycomb sandwich panels. The CFRTP core was made of plane woven carbon fiber-reinforced polypropylene prepreg sheets. The stacked CFRTP prepreg sheets were periodically hot-pressed at the node locations, and then expanded to form an all-CFRP honeycomb core. The resultant CFRTP honeycomb cores were glued with the same polypropylene-based plain-woven CFRTP skin plates. The mechanical performance of the all-CFRTP honeycomb sandwich panels was evaluated by flexural tes

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21

Brekken, Kristoffer Aune, Aase Reyes, Torodd Berstad, Magnus Langseth, and Tore Børvik. "Sandwich Panels with Polymeric Foam Cores Exposed to Blast Loading: An Experimental and Numerical Investigation." Applied Sciences 10, no. 24 (2020): 9061. http://dx.doi.org/10.3390/app10249061.

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Sandwich panels have proven to be excellent energy absorbents. Such panels may be used as a protective structure in, for example, façades subjected to explosions. In this study, the dynamic response of sandwich structures subjected to blast loading has been investigated both experimentally and numerically, utilizing a shock tube facility. Sandwich panels made of aluminium skins and a core of extruded polystyrene (XPS) with different densities were subjected to various blast load intensities. Low-velocity impact tests on XPS samples were also conducted for validation and calibration of a viscop

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22

Schagerl, M. "Analytical formulas for the effective width caused by bulging and flattening of curved aircraft panels." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 10 (2011): 2399–412. http://dx.doi.org/10.1177/0954406211412314.

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The skin of a curved aircraft panel flattens, if it is subjected to circumferential tension, and bulges, if it is subjected to compression. These deformations distort the hoop stress distribution, which further leads to a reduced load-carrying width of the skin in circumferential direction. The book Roark's Formulas for Stress and Strain (W. C. Young and R. G. Budynas, 2002) presents a method to calculate the effective width of wide flanges of curved beams under tension. Although often used, it is shown in the current article that this method is not applicable to assess the effects of flatteni

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Mitrofanov, O., E. Toropylina, Andrey Smolyaninov, and Inessa Lukmanova. "Design of z-shaped reinforced panels of composite materials under compression and shear." E3S Web of Conferences 383 (2023): 05015. http://dx.doi.org/10.1051/e3sconf/202338305015.

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When designing thin-walled aircraft structures, as a rule, the main limitations are associated with ensuring stability. The objects of research in this work are composite z-shaped reinforced panels of the wing box of an aircraft. For the early stages of the design of load-bearing panels, it is necessary to evaluate the weight of the design decisions made, taking into account possible defects. The paper proposes an analytical technique for designing reinforced panels, taking into account the use of the condition of uniform stability and the presence of possible regulated defects in the skin tha

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Damian, Andrei, Marian Alexandru, and Tiberiu Catalina. "Numerical Evaluation of the Solar Collectors Selfshading Related to their Building Integration." Mathematical Modelling in Civil Engineering 13, no. 4 (2017): 12–26. http://dx.doi.org/10.1515/mmce-2017-0011.

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AbstractIn view of the recent preoccupation at worldwide level, for the integration of the solar systems components within the building skin, we made a numerical investigation in order to assess the opportunity to implement a long string of solar panels along a horizontal or vertical building surface.The study analyses deals with the phenomenon of self-shading, which appears in the case of medium and large solar systems that use solar panels placed one behind the other, along the same row (individual string), but also under the shape of parallel rows (parallel strings). The study creates a mat

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Liu, Gang, Wei Tang, Ying-Lin Ke, Qing-Liang Chen, and Yunbo Bi. "Modeling of fast pre-joining processes optimization for skin-stringer panels." Assembly Automation 34, no. 4 (2014): 323–32. http://dx.doi.org/10.1108/aa-05-2014-036.

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Purpose – The purpose of this paper is to propose a new model for optimizing pre-joining processes quickly and accurately, guiding workers to standardized operations. For the automatic riveting in panel assemblies, the traditional approach of determination of pre-joining processes entirely rests on the experience of workers, which leads to the improper number, location and sequence of pre-joining, the low quality stability and the high repair rate in most cases. Design/methodology/approach – The clearances computation with the complete finite element model for every process combination is time

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Gavva, Lubov' Mikhailovna. "Buckling Problems of Structurally-Anisotropic Composite Panels of Aircraft with Influence of Production Technology." Materials Science Forum 971 (September 2019): 45–50. http://dx.doi.org/10.4028/www.scientific.net/msf.971.45.

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The different approaches were analyzed to investigate the buckling problems of structurally-anisotropic panels made from composite materials. Aircraft composite structure design in the field of production technology is the outlook research trend. New mathematical model relations for the buckling investigation of structurally-anisotropic panels comprising composite materials are presented in this study. The primary scientific novelty of this research is the further development of the theory of thin-walled elastic ribs related to the contact problem for the skin and the rib with an improved rib

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Zhang, Wen Chao, Yuan Guo, Zhi Dong Guan, Xia Guo, Wei He, and Ri Ming Tan. "Finite Element Analysis of Stiffened Composite Panels Subjected by Low-Velocity Impact." Applied Mechanics and Materials 644-650 (September 2014): 4726–30. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.4726.

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In this paper, the low-velocity performance of stiffened composite panels is investigated experimentally and numerically. In order to illustrate the effect of the stiffener, a number of plain laminates with same lay-up of the skin were impacted in various energies. Progressive damage models based on continuum damage mechanics (CDM) were used in combination with cohesive interface elements to predict the structural response and fracture mechanics of stiffened composite panels. The constitutive mode was implemented into the ABAQUS/Explicit FE code by user-defined material subroutines (VUMAT). Th

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Liuzzi, Stefania, Chiara Rubino, Pietro Stefanizzi, and Francesco Martellotta. "Performance Characterization of Broad Band Sustainable Sound Absorbers Made of Almond Skins." Materials 13, no. 23 (2020): 5474. http://dx.doi.org/10.3390/ma13235474.

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In order to limit the environmental impact caused by the use of non-renewable resources, a growing research interest is currently being shown in the reuse of agricultural by-products as new raw materials for green building panels. Moreover, the European directives impose the goal of sustainability supporting the investigation of passive solutions for the reduction of energy consumption. Thus, the promotion of innovative building materials for the enhancement of acoustic and thermal insulation of the buildings is an important issue. The aim of the present research was to evaluate the physical,

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Zhao, Mengmeng, Chuansi Gao, and Min Wang. "Development of Air Ventilation Garments with Small Fan Panels to Improve Thermal Comfort." Sustainability 15, no. 11 (2023): 8452. http://dx.doi.org/10.3390/su15118452.

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Air ventilation garments (AVGs) are reported to be effective in improving thermal comfort in hot environments in previous research. The purpose of this study was to develop AVGs with small fan panels and examine their cooling performance. Three AVGs equipped with more, much smaller sized ventilation fans were developed, including FFV (ten small fans all located on the front body), BBV (ten small fans all located on the back body), and FBV (six small fans located on the front body and four small fans located on the back body). Another garment, without ventilation fans but with the same structur

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Tsangouri, Eleni, Hasan Ismail, Matthias De Munck, Dimitrios G. Aggelis, and Tine Tysmans. "Reveal of Internal, Early-Load Interfacial Debonding on Cement Textile-Reinforced Sandwich Insulated Panels." Applied Sciences 11, no. 2 (2021): 879. http://dx.doi.org/10.3390/app11020879.

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Internal interfacial debonding (IID) phenomena on sandwich façade insulated panels are detected and tracked by acoustic emission (AE). The panels are made of a thin and lightweight cementitious composite skin. In the lab, the panels are tested under incremental bending simulating service loads (i.e., wind). Local (up to 150 mm wide) skin-core detachments are reported in the early loading stage (at 5% of ultimate load) and are extensively investigated in this study, since IID can detrimentally affect the long-term durability of the structural element. A sudden rise in the AE hits rate and a shi

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Croitoru, Emilian Ionut, and Gheorghe Oancea. "Impact Properties of Parts Manufactured from Fiberglass and Kevlar Composite Panels." Applied Mechanics and Materials 809-810 (November 2015): 938–43. http://dx.doi.org/10.4028/www.scientific.net/amm.809-810.938.

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This paper presents a method of finite element modelling used to study the effect of laminates orientation and thickness on impact properties of a composite sandwich panel made of glass and kevlar fibers in an epoxy resin matrix. In this research, the composite sandwich panel consists of a fuselage skin panel from an aircraft having two configurations: (0/90/0/90/core/90/0/90/0) and (0/90/45/-45/core/-45/45/90/0). This panel is loaded with one uniform distributed abuse loading case and the stress variation within the composite panel for each configuration is determined.

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Kananen, Markku, Antti Järvenpää, Matias Jaskari, and Kari Mäntyjärvi. "Mechanical Properties of a “Simple Panel Structure” Manufactured of an Ultra High Strength Stainless Steel." Key Engineering Materials 786 (October 2018): 319–24. http://dx.doi.org/10.4028/www.scientific.net/kem.786.319.

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Corrugated core panels contain a formed, corrugated core bonded between two skin sheets. These panels are typically used in applications, where a low weight is required with integrity in stiffness. This paper demonstrates the mechanical properties of a simple panel structure (SPS), constructed using strips of work-hardened, austenitic stainless steel (ASS) grade 1.4310 (type 301) with the yield strength (YS) of ~1200 MPa. The 0.5 mm thick strips were formed into a C-shape and subsequently laser welded together by lap joints to form a SPS. The thickness of the SPS was 50 mm. The bending tests f

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Korcz-Konkol, Natalia, and Piotr Iwicki. "Corrugated Sheeting as a Member of a Shear Panel Under Repeated Load—Experimental Test." Materials 13, no. 18 (2020): 4032. http://dx.doi.org/10.3390/ma13184032.

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In stressed-skin design, the cladding stiffening effect on structures is taken into account. However, the “traditional” design is more usual, wherein this effect is neglected. Even if the diaphragm actions are not regarded, in particular cases such as big sheds (and others), the parasitic (unwanted) stressed-skin action may occur with the result of leakage or even failure. The structures of this kind have already been built. Thus, an important question arises: How can one assess them if there is a need to correct or redesign them? What kind of non-destructive approach can be used to achieve th

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Azouaoui, Krimo, and Said Mouhoubi. "Study on Damage Modes of a Sandwich Panel Impacted Repeatedly." Advanced Materials Research 980 (June 2014): 147–51. http://dx.doi.org/10.4028/www.scientific.net/amr.980.147.

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This paper describes an experimental investigation for determining the damage modes under low energy impact-fatigue of sandwich panels consisting of aluminum skins supported by honeycomb core made of aluminum. Square samples of 125mm by 125mm sides and 10mm thickness (skin of 0.6mm and 8.8mm of core) were subjected to impact fatigue loading using a testing machine at four different energy levels (2J, 3J, 5J and 7J). The square plates are clamped in a fixture system over a 100mm diameter hole. Three different diameters of impactor head (15mm, 25mm and 35mm) are used to study their influence on

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Hassanin, Ahmed H., Zeki Candan, Cenk Demirkir, and Tamer Hamouda. "Thermal insulation properties of hybrid textile reinforced biocomposites from food packaging waste." Journal of Industrial Textiles 47, no. 6 (2016): 1024–37. http://dx.doi.org/10.1177/1528083716657820.

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Due to the significant and harmful effect of the global warming on our communities, health, and climate, the usage of thermal insulation material in building is must to decrease the energy consumption and to improve energy efficiency. On the other hand, the utilization of waste and biomass resources for developing new bio-based composite materials is attracting much attention for the environmental and socioeconomics. Therefore, in this study, thermal insulation bio-based composite panels from Tetra Pak® waste and wool fiber waste with different ratios were manufactured. Likewise, other sandwic

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Larin, A. A., M. Yu Fedotov, O. N. Budadin, V. A. Aniskovich, S. O. Kozel’skaya, and V. I. Reznichenko. "ON THE EXPERIENCE OF COMPUTED X-RAY TOMOGRAPHY OF REINFORCED THREE-STRINGER PANELS MADE OF POLYMER COMPOSITE MATERIALS." Kontrol'. Diagnostika, no. 274 (April 2021): 40–49. http://dx.doi.org/10.14489/td.2021.04.pp.040-049.

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Experimental studies of the possibility of the MCT method for NC three-stringer panels made of PCM by the method of autoclave molding have been carried out. Based on the results of the experimental studies, it was shown that the MCT method makes it possible with a high reliability to identify defects in composite structures at the stage of final inspection (immediately after production), which is especially important for highly loaded and critical structures made of carbon composite materials based on polymer matrices of various types. On the example of testing a three-stringer (reinforced) pa

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Bisagni, C., and R. Vescovini. "A fast procedure for the design of composite stiffened panels." Aeronautical Journal 119, no. 1212 (2015): 185–201. http://dx.doi.org/10.1017/s0001924000010332.

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AbstractThis paper describes the analysis and the minimum weight optimisation of a fuselage composite stiffened panel made from carbon/epoxy material and stiffened by five omega stringers. The panel investigated inside the European project MAAXIMUS is studied using a fast tool, which relies on a semi-analytical procedure for the analysis and on genetic algorithms for the optimisation. The semi-analytical approach is used to compute the buckling load and to study the post-buckling response. Different design variables are considered during the optimisation, such as the stacking sequences of the

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Croitoru, Emilian Ionut, and Gheorghe Oancea. "Effect of Laminates Orientation on Impact Properties of Fiberglass and Kevlar Composite Panels." Applied Mechanics and Materials 808 (November 2015): 119–24. http://dx.doi.org/10.4028/www.scientific.net/amm.808.119.

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This paper presents the study of the effect of laminates angle on impact properties of a composite panel made of glass and Kevlar fibers using finite element modelling. In this research, the composite panel consists of a skin panel, specifically the front left wing, from an automotive vehicle having multiple configurations. A distributed pressure on the composite package represents the loading on the selected panel modelled as one uniform distributed abuse loading case and the stress variation within the composite panel for each configuration is determined. The results of these analyses are us

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Corrao, Rossella. "Mechanical Tests on Innovative BIPV Façade Components for Energy, Seismic, and Aesthetic Renovation of High-Rise Buildings." Sustainability 10, no. 12 (2018): 4523. http://dx.doi.org/10.3390/su10124523.

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The paper shows the results of mechanical tests carried out on prototypes of a new Building Integrated Photovoltaic (BIPV) component developed by the author and SBskin Smart Building Skin s.r.l. This patented innovative component is able to merge structural function, insulation proprieties, and production of clean energy for retrofit actions and/or the construction of translucent façades in high-rise buildings located in different climatic contexts. Due to colored PV cells integrated into 3 Dimensional (3D) glass components and the dry-assembly system used for assembling them into precast and

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Ucan, Hakan, Joachim Scheller, Chinh Nguyen, et al. "Automated, Quality Assured and High Volume Oriented Production of Fiber Metal Laminates (FML) for the Next Generation of Passenger Aircraft Fuselage Shells." Science and Engineering of Composite Materials 26, no. 1 (2019): 502–8. http://dx.doi.org/10.1515/secm-2019-0031.

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AbstractThe use of fiber-metal laminates (FML) allows for substantial advantages over a fuselage skin made of monolithic aluminum materials. Glass fiber prepreg reinforced aluminium is characterized by high damage tolerance capabilities, supporting the structural strength capability in case of any kind of damage. For this reason, FML, and GLARE in particular, have been identified as superior materials for aerospace applications. More than 400m2 FML is applied on each A380, as skin panels and as D-noses for both, vertical and horizontal stabilizer. FML possess the potential to become the baseli

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Fernández-Calvo, Ana Isabel, Clara Delgado, Philippe Dufour, Egoitz Aldanondo, Mario Díaz, and María Belén García-Blanco. "New EoL Routes of Al-Li Aircraft Integral LBW and FSW Welded Panels including New Cr-Free Coatings." Crystals 13, no. 5 (2023): 807. http://dx.doi.org/10.3390/cryst13050807.

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The end of fife (EoL) of new aircraft panels made of Al-Li alloys in which the stringers and skin were joined, either by laser beam welding (LBW) or by friction stir welding (FSW), was investigated at the lab scale. Different cutting strategies, ranging from cutting only for size reduction to full separation of all materials, including the removal of the welded seam, were defined, with the objective of recycling the maximum amount of panel scrap back into high-quality aircraft Al-Li alloys. Those welded aerostructures were coated with two novel Cr-free coating systems. The effect of the coatin

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Heitmann, M., P. Horst, and D. Fitzsimmons. "Effective stiffness of postbuckled stiffened metallic panels under combined compression and shear stress." Journal of Strain Analysis for Engineering Design 38, no. 6 (2003): 539–55. http://dx.doi.org/10.1243/030932403770735908.

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The paper deals with the analysis of the effective stiffness of stiffened metallic panels under combined compression and shear stress as used, for example, in aircraft fuselages. The first part presents the realization of the compression and shear test facility in a finite element model. Verification of the finite element model is important for subsequent parameter variations. The second part of the paper presents the approach used to find the effective skin stiffness. On the one hand, a comparison between the results for pure compression stress and the effective width method is made and, on t

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Максименков, В. И., М. В. Молод, and П. С. Огурцов. "LAYERED PANEL FOR THE AIR INTAKE CHANNEL OF THE AIRCRAFT." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, no. 2 (May 5, 2023): 135–39. http://dx.doi.org/10.36622/vstu.2023.19.2.020.

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рассмотрены вопросы проведения анализа применяемых сотовых панелей в каналах воздухозаборника самолетов. Приведены трехслойные сотовые панели, применяемые в конструкции пассажирских самолетов, соответствующих 4 главе Международного стандарта ИКАО (Конвекция о международной гражданской авиации). Поставлена задача повышения акустической эффективности слоистых панелей за счет создания новых конструкций. Приведена трехслойная конструкция, подтвержденная патентом, которая состоит из верхнего несущего слоя, выполненного из перфорированной обшивки и сеток С 685, и слоев сотового заполнителя, плотност

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Mills, James A., Andrew W. Hamilton, David I. Gillespie, et al. "Identifying Defects in Aerospace Composite Sandwich Panels Using High-Definition Distributed Optical Fibre Sensors." Sensors 20, no. 23 (2020): 6746. http://dx.doi.org/10.3390/s20236746.

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Automated methods for detecting defects within composite materials are highly desirable in the drive to increase throughput, optimise repair program effectiveness and reduce component replacement. Tap-testing has traditionally been used for detecting defects but does not provide quantitative measurements, requiring secondary techniques such as ultrasound to certify components. This paper reports on an evaluation of the use of a distributed temperature measurement system—high-definition fibre optic sensing (HD-FOS)—to identify and characterise crushed core and disbond defects in carbon fibre re

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Дибир, А. Г., А. А. Кирпикин та Н. И. Пекельный. "ЩОДО ПИТАННЯ ПРО РАЦІОНАЛЬНУ ФОРМУ ПРЕСОВАНОГО БУЛЬБОКОСИНЦЯ". Open Information and Computer Integrated Technologies, № 87 (30 червня 2020): 165–72. http://dx.doi.org/10.32620/oikit.2020.87.09.

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In airplane building and helicopter engineering a bulb angle bar  an angle bar with a bulb at the end of a wall are widespread. They are better than a simple angle bar, since they have higher critical stresses under compression more than the proportionality limit. They are better than T bar, as T bar are fastened with two rows of rivets, which impairs tightness. Bulb angle bar are better than Z bar. The latter are higher, which reduces the structural height of the cross section and increases the load on the panel and usually have an excess cross-sectional area. Bulb angle bars are widely used

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Mirdehghan, Abolfazl, Hooshang Nosraty, Mahmood M. Shokrieh, Roohallah Ghasemi, and Mehdi Akhbari. "Micromechanical modelling of the compression strength of three-dimensional integrated woven sandwich composites." Journal of Industrial Textiles 48, no. 9 (2018): 1399–419. http://dx.doi.org/10.1177/1528083718764909.

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This paper is concerned with a theoretical and experimental verification of a micromechanical model of newly developed sandwich panels denoted as 3D integrated woven sandwich composite panels. The integrated hollow core was made of a pile of 3D bars with a special configuration. Integrated woven sandwich composite panels consist of two fabric faces which were interwoven by pile fibers and therefore a very high skin core debonding resistance was obtained. With the objective of qualifying the mechanical properties of these structures, fairly extensive experimental research was carried out by inv

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Citarella, Roberto G., M. Silvestri, and A. Apicella. "DBEM Crack Growth Simulation and Experimental Results for a Multi-Layer and Multi-Material Aeronautic Panel." Key Engineering Materials 324-325 (November 2006): 1123–26. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.1123.

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A special specimen was created cutting a rectangular notched area from the surrounding of the upper left corner of a wide body aircraft door. This part of the aircraft skin is made of different layers with variable thickness and material (titanium or aluminum). Then a fatigue traction load was applied and some notches were cut in the different layers in order to speed up the crack initiation and reproduce a realistic crack scenario. Such through cracks were monitored during their propagation along the specimen width, in order to have available for the simulation a realistic initial scenario an

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Aldrete, Jonathan, Christopher J. Peterson, James A. Tarbox, and John S. Pixley. "Polymyositis Presenting With Nontraumatic Rhabdomyolysis and Dysphagia: A Case Report." Journal of Investigative Medicine High Impact Case Reports 10 (January 2022): 232470962210745. http://dx.doi.org/10.1177/23247096221074589.

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Idiopathic inflammatory myopathies (IIMs) are a rare, heterogeneous group of diseases with a characteristic clinical presentation consisting of muscle inflammation and weakness. They often present with accompanying extra-muscular findings, most notably in the skin, lungs, and joints. Inflammatory myopathies are also identified by their characteristic laboratory abnormalities, including a 10- to 50-fold increase in creatinine kinase, elevated liver enzymes, and characteristic electromyography and magnetic resonance imaging findings. Distinct autoimmune markers and clinical phenotypes have advan

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Zhao, Han, I. Elnasri, and Hui Jian Li. "Cellular Structures under Impact Loading." Materials Science Forum 539-543 (March 2007): 1880–85. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1880.

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This paper presents a study of the strength enhancement under impact loading of metallic cellular materials as well as sandwich panels with cellular core. It begins with a review of likely causes responsible for the strength enhancement of cellular materials. A testing method using 60mm diameter Nylon Hopkinson pressure bars is used to investigate the rate sensitivity of various metallic cellular materials. In order to identify the factor responsible for the strength enhancement of those materials, an experimental analysis is performed on a model structure which is a square tube made of rate i

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Brahma, Siddhartha, Vikas Patel, Selvum Pillay, Haibin Ning, and Vinoy Thomas. "Characterization of discontinuous carbon fiber liquid molded PA-6 composites via strategic placement of additional reinforcements." Journal of Reinforced Plastics and Composites 37, no. 22 (2018): 1335–45. http://dx.doi.org/10.1177/0731684418793718.

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The flexibility of processing PA6-based discontinuous carbon fiber panels using vacuum-assisted resin transfer molding was studied. The ease of incorporating various reinforcements namely baseline, tow in the center of preform, fabric in the center of preform and fabric on the outside as skin was investigated. Mechanical characterization was conducted on all the variations made. There was an average increase of about 3%, 20% and 47% in the tensile properties of tow in the center, fabric in the center and fabric on the outside as skin, respectively, as compared to the baseline. A similar increa

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