A Model of Packaging Folds in Thin Metal-Polymer Laminates

2017 ◽  
Vol 84 (10) ◽  
Author(s):  
Gabriel Secheli ◽  
Andrew Viquerat ◽  
Guglielmo S. Aglietti
Keyword(s):  
Experimental Data ◽  
Internal Pressure ◽  
Numerical Method ◽  
Metal Films ◽  
Thin Metal ◽  
Space Structures ◽  
Polymer Metal ◽  
Polymer Laminates ◽  
Metal Polymer ◽  
Good Agreement

Thin metal-polymer laminates make excellent materials for use in inflatable space structures. By inflating a stowed envelope using pressurized gas and by increasing the internal pressure slightly beyond the yield point of the metal films, the shell rigidizes in the deployed shape. Structures constructed with such materials retain the deployed geometry once the inflation gas has either leaked away, or it has been intentionally vented. For flight, these structures must be initially folded and stowed. This paper presents a numerical method for predicting the force required to achieve a given fold radius in a three-ply metal-polymer-metal laminate and to obtain the resultant springback. A coupon of the laminate is modeled as a cantilever subject to an increasing tip force. Fully elastic, elastic–plastic, relaxation, and springback stages are included in the model. The results show good agreement when compared with experimental data at large curvatures.

Springback Analysis for Metal-Polymer-Metal Laminates

2003 ◽  
Author(s):  
Li Liu ◽  
Jyhwen Wang
Keyword(s):  
Experimental Data ◽  
Sheet Metal ◽  
Shape Control ◽  
Analytical Approach ◽  
Laminated Structure ◽  
Flat Sheet ◽  
Potential Applications ◽  
Polymer Metal ◽  
Metal Polymer ◽  
Good Agreement

Metal-polymer-metal laminate is an emerging material that has many potential applications. The laminated structure consists of two outer layers of sheet metal and a polymeric center core. The material offers an excellent sound deadening properties and is being introduced to applications where noise reduction is desired. Part manufacturing for laminates involves converting a flat sheet into a deformed body. Springback has been a major concern in shape control. While bending of a single layered sheet metal does not exhibit significant sidewall curl, the problem is pronounced in bending laminates. This paper presents an analytical approach to predict springback and sidewall curl of laminates due to simple bending. Based on the models, springback factor Ks is calculated. It is shown that the prediction is in good agreement with the published experimental data.

Doppler-Shifted Cyclotron Resonance in Thin Metal Films

1972 ◽  
Vol 50 (18) ◽  
pp. 2122-2137
Author(s):  
R. Turner ◽  
J. F. Cochran
Keyword(s):  
Magnetic Field ◽  
Metal Films ◽  
Thin Metal Film ◽  
Thin Metal ◽  
Free Electrons ◽  
Fermi Surfaces ◽  
First Order ◽  
Simple Quantum ◽  
The Magnetic Field ◽  
Good Agreement

According to Van Gelder the microwave absorption by a thin metal film in the presence of a static magnetic field normal to the film contains a series of peaks as the magnetic field is varied. In the present paper it is argued that these peaks correspond to Doppler-shifted cyclotron resonances of the carriers in the metal due to the quantization of electron momenta normal to the plane of the film. A simple quantum calculation is presented for the case of free electrons where the film is thin enough that to first order the microwave fields within are determined only by the boundary conditions and Maxwell's equations. The quantum expression is in good agreement with the absorption calculated using semiclassical arguments which can be readily extended to more complicated Fermi surfaces.

Study of Civil-Plane High-Lift Model Using Omni-Tree Cartesian Grids

2012 ◽  
Vol 249-250 ◽  
pp. 1019-1024
Author(s):  
Chao Xi ◽  
Wei Min Sang
Keyword(s):  
Experimental Data ◽  
Numerical Method ◽  
Finite Volume Method ◽  
Cartesian Grid ◽  
High Lift ◽  
Face To Face ◽  
Time Stepping ◽  
Dual Time Stepping ◽  
Volume Method ◽  
Good Agreement

We developed a CFD code applies the omni-tree Cartesian grid to simulate the flow fields around one civil-plane high-lift model using the multi-zone technique. With a face-to-face algorithm, the flow control equations are solved numerically, in combination with the cell-center finite volume method and dual-time stepping scheme. The computed results are in good agreement with the experimental data and show preliminarily that numerical method is effective.

Invisible mechanical lap joints for metal–polymer laminates

2020 ◽  
pp. 146442072096214
Author(s):  
RJS Batista ◽  
JPM Pragana ◽  
IMF Bragança ◽  
CMA Silva ◽  
PAF Martins
Keyword(s):  
Research Work ◽  
Lap Joints ◽  
Lightweight Construction ◽  
Forming Force ◽  
Complete Filling ◽  
Sheet Bending ◽  
Polymer Metal ◽  
New Type ◽  
Polymer Laminates ◽  
Metal Polymer

Joining by compression of metallic inserts has been recently developed by the authors to create invisible lap joints between metal and polymer laminates. This paper revisits the process with the objective of proposing a new type of bi-material (polymer–metal) cylindrical insert for lightweight construction applications that is capable of ensuring complete filling of the joint at the end of stroke without increasing the forming force and the risk of sheet bending. The presentation is built upon a combined experimental and finite element research work focused on the modes of deformation, formability limits, forming forces, and resistance strength that lap joints produced with the new bi-material cylindrical inserts are able to withstand before failing. Results allowed designing a simple and easy to fabricate bi-material cylindrical insert that overcomes the main problems that have been pointed out to the metallic inserts earlier proposed by the authors.

Quasi-Static Flexural and Indentation Behaviour of Polymer-Metal Laminate

2014 ◽  
Vol 970 ◽  
pp. 88-90
Author(s):  
Syed Mohd Saiful Azwan ◽  
Yahya Mohd Yazid ◽  
Ayob Amran ◽  
Behzad Abdi
Keyword(s):  
Composite Laminate ◽  
Loading Rate ◽  
Plastic Material ◽  
Testing Machine ◽  
Aluminium Composite ◽  
Loading Rates ◽  
Universal Testing ◽  
Polymer Metal ◽  
Polymer Laminates ◽  
Metal Polymer

Metal-polymer laminates were subjected to quasi-static flexural and indentation loading. The laminates were made of two aluminium skins heat-bonded (laminated) to a core made of polyethylene plastic material. The samples were trimmed into standard-sized beams and panels which were then tested in flexural and indentation using the Instron universal testing machine at loading rates of 1 mm/min, 10 mm/min and 100 mm/min. The load-displacement and energy absorption curves of the composite beams were recorded. It was found that the loading rate has a large effect on flexural and indentation behaviour of aluminium composite laminate.

Development of Numerical Method for Prediction of Maneuvering Performance of Marine Vehicle

2010 ◽  
Vol 44-47 ◽  
pp. 929-934 ◽  
Author(s):  
Lei Yue ◽  
Da Kui Feng ◽  
Zhi Guo Zhang ◽  
Jing Guo Lu ◽  
Shuai Zhang
Keyword(s):  
Experimental Data ◽  
Numerical Method ◽  
Pressure Coefficient ◽  
Cross Flow ◽  
Skin Friction Coefficient ◽  
Circular Motion ◽  
Commercial Code ◽  
Turning Motion ◽  
Marine Vehicle ◽  
Good Agreement

Numerical maneuvering tank (NMT) is developed which could be used for investigating the flow physics involving the interaction of the flow shed from the sail and the cross-flow boundary layer of the hull, interaction between the hull and appendages like rudder and propeller during maneuvering operation. Two numerical codes are used for this study: CADMV (computer aid design of marine vehicle) and FLUENT commercial code. They are validated against each other and compared with experimental measurement results. Pressure coefficient and skin friction coefficient are obtained and compared with experimental data available in the literature. The simulation results show good agreement with the experimental data. NMT was developed based on above numerical method to simulate the circular motion of marine vehicle. The steady, uniform flow fields are obtained and the characteristics of rotation flow show good agreement with actual phenomena. The circular motion simulations of a SUBOFF in NMT is conducted at different angle of drifts of hull. The obtaining of hydrodynamics parameters is very important for accurately predicting the hydrodynamic behavior of a maneuvering marine vehicle in turning motion.

Metal Microstructures in Advanced CMOS Devices

1996 ◽  
Vol 54 ◽  
pp. 358-359
Author(s):  
L. M. Gignac ◽  
K. P. Rodbell
Keyword(s):  
Grain Boundaries ◽  
Semiconductor Device ◽  
Chemical Vapor ◽  
Microstructural Characterization ◽  
Metal Films ◽  
Thin Metal ◽  
Electrical Performance ◽  
Thin Metal Films ◽  
Chemical Vapor Deposited ◽  
Boundary Properties

As advanced semiconductor device features shrink, grain boundaries and interfaces become increasingly more important to the properties of thin metal films. With film thicknesses decreasing to the range of 10 nm and the corresponding features also decreasing to sub-micrometer sizes, interface and grain boundary properties become dominant. In this regime the details of the surfaces and grain boundaries dictate the interactions between film layers and the subsequent electrical properties. Therefore it is necessary to accurately characterize these materials on the proper length scale in order to first understand and then to improve the device effectiveness. In this talk we will examine the importance of microstructural characterization of thin metal films used in semiconductor devices and show how microstructure can influence the electrical performance. Specifically, we will review Co and Ti silicides for silicon contact and gate conductor applications, Ti/TiN liner films used for adhesion and diffusion barriers in chemical vapor deposited (CVD) tungsten vertical wiring (vias) and Ti/AlCu/Ti-TiN films used as planar interconnect metal lines.

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

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