Sandwich Panels Made of Perforated Metal Materials

2021 ◽  
Vol 320 ◽  
pp. 155-160
Author(s):  
Viktor Mironov ◽  
Mihails Lisicins ◽  
Irina Boiko
Keyword(s):  
Experimental Studies ◽  
Sandwich Panels ◽  
Skin Layer ◽  
Core Material ◽  
Metallic Materials ◽  
Element Analysis ◽  
Metallic Material ◽  
Wide Range ◽  
The Finite Element Analysis ◽  
Metallic Sheet

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 the core material the wide range of products for the construction, damping or isolation purposes could be manufactured. In the paper the example of using of perforated metallic sheet materials for manufacturing the sandwich panels is proposed. Both, the simulation and experimental studies (mechanical testing) were carried out in order to assess the load-bearing capacity of sandwich panels and to prove the applicability of the proposed sandwich panels for construction structures. For the analysis of the achieved structures the finite element analysis (FEA) software was used. The simulation results are well-coincided with the results of the experimental studies. Thus, new types of the sandwich panels and the manufacturing technology thereof are shown its reliability and could be recommended for application in the different branches, in particular for producing lightweight ceiling panels with filler from heat insulating materials.

Probabilistic model of surface layer removal when grinding brittle non-metallic materials

2021 ◽  
Vol 23 (2) ◽  
pp. 6-16
Author(s):  
Sergey Bratan ◽  
◽  
Stanislav Roshchupkin ◽  
Alexander Kharchenko ◽  
Anastasia Chasovitina ◽  
...  
Keyword(s):  
Surface Layer ◽  
Contact Zone ◽  
Probabilistic Model ◽  
Material Removal ◽  
Brittle Materials ◽  
Grinding Wheel ◽  
Metallic Materials ◽  
Deformable Solid ◽  
Metallic Material ◽  
Wide Range

Introduction. The final quality of products is formed during finishing operations, which include the grinding process. It is known that when grinding brittle materials, the cost of grinding work increases significantly. It is possible to reduce the scatter of product quality indicators when grinding brittle materials, as well as to increase the reliability and efficiency of the operation, by choosing the optimal parameters of the technological system based on dynamic models of the process. However, to describe the regularities of the removal of particles of a brittle non-metallic material and the wear of the surface of the grinding wheel in the contact zone, the known models do not allow taking into account the peculiarities of the process in which micro-cutting and brittle chipping of the material are combined. Purpose of the work: to create a new probabilistic model for removing the surface layer when grinding brittle non-metallic materials. The task is to study the laws governing the removal of particles of brittle non-metallic material in the contact zone. In this work, the removal of material in the contact zone as a result of microcutting and brittle chipping is considered as a random event. The research methods are mathematical and physical simulation using the basic provisions of the theory of probability, the laws of distribution of random variables, as well as the theory of cutting and the theory of a deformable solid. Results and discussion. The developed mathematical models make it possible to trace the effect on material removal of the overlap of single cuts on each other when grinding holes in ceramic materials. The proposed dependences show the regularity of stock removal within the arc of contact of the grinding wheel with the workpiece. The considered features of the change in the probability of material removal upon contact of the treated surface with an abrasive tool and the proposed analytical dependences are valid for a wide range of grinding modes, wheel characteristics and a number of other technological factors. The obtained expressions make it possible to find the amount of material removal also for schemes of end, flat and circular external grinding, for which it is necessary to know the amount of removal increment due to brittle fracture during the development of microcracks in the surface layer. One of the ways to determine the magnitude of this increment is to simulate the crack formation process using a computer. The presented results confirm the prospects of the developed approach to simulate the processes of mechanical processing of brittle non-metallic materials.

ANALYTICAL AND EXPERIMENTAL STUDIES ON 400 kV S/C PORTAL-TYPE GUYED TOWERS

2009 ◽  
Vol 09 (01) ◽  
pp. 85-106
Author(s):  
N. PRASAD RAO ◽  
S. J. MOHAN ◽  
R. P. ROKADE ◽  
R. BALA GOPAL
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Studies ◽  
Ground Level ◽  
Test Results ◽  
Element Analysis ◽  
Finite Element Software ◽  
The Finite Element Analysis ◽  
Guyed Towers ◽  
Analytical Behavior

The experimental and analytical behavior of 400 kV S/C portal-type guyed towers under different loading conditions is presented. The portal-type tower essentially consists of two masts extending outward in the transverse direction from the beam level to the ground. In addition, two sets of guys connected at the ground level project outward along the longitudinal axes and converge in the transverse axes. The experimental behavior of the guyed tower is compared with the results of finite element analysis. The 400 kV portal-type guyed towers with III and IVI type insulator strings are analyzed using finite element software. Full scale tower test results are verified through comparison with the results of the finite element analysis. The initial prestress in the guys is allowed to vary from 5% to 15% in the finite element modeling. The effect of prestress variation of the guys on the tower behavior is also studied.

Application of subloading-overstress friction model to finite element analysis

2014 ◽  
Vol 4 (2) ◽  
Author(s):  
T. Kuwayama ◽  
K. Hashiguchi ◽  
N. Suzuki ◽  
N. Yoshinaga ◽  
S. Ogawa
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Flat Surface ◽  
Surface Friction ◽  
Friction Model ◽  
Sliding Velocity ◽  
Element Analysis ◽  
Contact Behaviour ◽  
Wide Range ◽  
The Finite Element Analysis

Accurate prediction of contact behaviour between machine tools and metals is required for the mechanical design of machinery. In this article, the numerical analysis of the contact behaviour is described by incorporating the subloading-overstress model [6] which is capable of describing the contact behaviour for a wide range of sliding velocity including the increase of coefficient of friction with the increase of sliding velocity. And its validity is verified by the comparison with some test results. First, in order to examine the influence of sliding velocities on the friction properties, the flat-surface friction tests for lubricated interfaces between galvannealed steel sheet and SKD-11 tool steel were performed. As a result, It is observed that the friction smoothly translate to kinetic friction, after exhibiting the peak at the static friction. In addition, it is observed that the higher the sliding velocity, the larger the friction resistance, meaning the positive rate sensitivity. Then the subloading-overstress model is implemented in the finite element analysis program ABAQUS/Standard, and it is used to simulate the flat-surface friction tests. The predictions from the finite element analysis are shown to be in very good agreement with experimental results.

scholarly journals Study of structural changes in metallic materials subjected to shock stress

2018 ◽  
Vol 178 ◽  
pp. 04011
Author(s):  
Sorin Cristea ◽  
Marius Bibu
Keyword(s):  
Alloy Steel ◽  
Structural Changes ◽  
Layered Materials ◽  
Material Behavior ◽  
Impact Point ◽  
Metallic Materials ◽  
Metallic Material ◽  
Wide Range ◽  
The Impact ◽  
Shock Stress

Behavior analysis of materials subjected to extreme demands remains a topical field for a wide range of engineering applications. The materials in discussion are in increasing numbers composites or layered materials, but homogeneous materials are not neglected either. The paper addresses the topic of a homogeneous metallic material subjected to shock loads. Two different thicknesses of alloy steel of known composition were used. Thicknesses used were of 4 mm and 6 mm respectively. After the loads were applied, the samples were cut in the direction of planes passing through the impact point; the microdurity was measured in the crosssection obtained and the medium microdurity areas were plotted. The obtained results allowed the identification of particularities in material behavior, in relation with the thickness, for the same values of the shock energy load and same shape of the penetrator.

The perforation resistance of sandwich structures subjected to low velocity projectile impact loading

2012 ◽  
Vol 116 (1186) ◽  
pp. 1247-1262 ◽  
Author(s):  
J. Zhou ◽  
Z. W. Guan ◽  
W. J. Cantwell
Keyword(s):  
Sandwich Structures ◽  
Sandwich Panels ◽  
Impact Testing ◽  
Impact Response ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Analysis Package ◽  
The Impact

Abstract This article presents the findings of a study to investigate the impact perforation resistance of sandwich structures. The dynamic response of sandwich panels based on PVC foam cores has been evaluated by determining the energy to perforate the panels. The impact response of the sandwich structures was predicted using the finite element analysis package Abaqus/Explicit. The validated FE models were also used to investigate the effect of oblique loading and to study the impact response of sandwich panels subjected to a pressure differential equivalent to flying at an altitude of 10,000m. Low velocity impact testing has shown that the energy to perforate the sandwich panels is dependent on the properties of the core. It has been shown that increasing the density of the crosslinked PVC foams by a factor of two yielded a 600% increase in the perforation resistance of the sandwich structures. At higher densities, the crosslinked foam sandwich structures offered a superior perforation resistance to the linear PVC structures. The numerical analysis accurately predicted the perforation energies of the sandwich panels, as well as the prevailing failure mechanisms following impact. Finally, it has been shown that sandwich panels impacted at high altitude offer a similar perforation resistance to those tested at sea level.

Finite-Element Study of C-Ring Fracture Specimens for the Determination of Design Strength Data

1995 ◽  
Author(s):  
A. E. Segall ◽  
O. Jadaan ◽  
J. Palko
Keyword(s):  
Finite Element ◽  
Experimental Studies ◽  
Plane Stress State ◽  
Effective Area ◽  
Element Analysis ◽  
Design Data ◽  
Design Strength ◽  
Wide Range ◽  
Computational Errors

Abstract To investigate the design implications of using C-ring specimens for evaluating the strength controlling flaw population(s) of ceramics when in tubular form, finite-element analysis (FEA) calculations were performed using the ANSYS code. These calculations focused on the ranges of width-to-thickness ratios required to maintain a plane stress state within the C-ring specimen during fracture. In addition, the validity of the theoretical effective-area (KA) and effective-volume (KV) relations derived during earlier analytical and experimental studies were investigated. Results of the FEA calculations indicated that a wide range of width-to-thickness ratios could be safely used to extract fracture strength design data. Moreover, the calculations confirmed the validity of the theoretical stress-area and stress-volume relations used to correlate strength defining flaw population and determine Weibull parameters. However, a tendency for the computational errors to increase with Weibull modulus was observed during the finite-element based estimations of effective-areas and -volumes.

Improvement of the Frontal Structure of a Bus for Crash Accidents

2012 ◽  
Author(s):  
P. D. Jeyakumar ◽  
G. Devaradjane
Keyword(s):  
Geometric Modeling ◽  
The Body ◽  
Side Impact ◽  
Element Analysis ◽  
Power Train ◽  
Frontal Crash ◽  
Wide Range ◽  
The Finite Element Analysis ◽  
Body In White ◽  
Bus Structure

The increasing legal and customer demands on passive safety of automobiles have to be fulfilled under the conditions of shortened development times and cost reductions. Today the design process of a bus with regard to its crashworthiness function is driven by a virtual development. A wide range of different applications has to be covered by simulation influencing the design of body-in-white, interior and exterior trim, chassis and power train. In recent days more emphasis has been given to Passenger bus rollover analysis and side impact but the study of frontal impact behaviour of the passenger bus is ignored. The finite element analysis is used for estimating the damage of the passenger bus due to the frontal crash. The vehicle model is allowed to frontal crash with rigid material. The deformation and displacement characteristics of the structure are analyzed at different speeds. Geometric modeling of the bus structure has been created by using CATIA cad package and discritized by ANSYS LS-Dyna. The numerical simulation is carried out for different velocities of bus structure. The results of displacement during collision are plotted on the graph. Some improvements were suggested in the body structure after analysing different types of crack initiators.

Blister propagation in sandwich panels

2019 ◽  
Vol 21 (5) ◽  
pp. 1683-1699
Author(s):  
Magnus Burman ◽  
Fredrik Stig ◽  
Dan Zenkert
Keyword(s):  
Finite Element ◽  
Fluid Pressure ◽  
Compressive Load ◽  
Sandwich Panels ◽  
Element Analysis ◽  
Air Volume ◽  
The Finite Element Analysis ◽  
Digital Correlation ◽  
Failure Loads ◽  
Element Approach

This paper deals with the problem of face/core interfacial disbonds in sandwich panels that are pressurised, i.e. the disbond has an initial fluid pressure that causes the disbond to deform. The problem is often referred to as a blister. The panel with a blister is then subjected to an in-plane compressive load. Four different panels are analysed and tested, having different size disbonds and different initial internal pressure. The cases are analysed using a finite element approach where the blister is modelled using fluid elements enabling the pressure inside the blister to vary as the in-plane load is applied. The analysis uses non-linear kinematics, and in each load step, the energy release rate is calculated along the disbond crack front. This model is used for failure load predictions. The four cases are then tested experimentally by filling a pre-manufactured disbond cavity with a prescribed volume of air. This air volume is then entrapped, and the panel is subjected to an in-plane compressive load. The load and blister pressures are measured throughout the test and compared with the finite element analysis. Surface strains and blister deformations are also measured using digital correlation measurements. The predicted failure loads compare well with the experimental results, and so does the blister pressures, the latter at least qualitatively.

Design and microfabrication of a compliant microgripper using nonbrittle and biocompatible material

2013 ◽  
Vol 227 (12) ◽  
pp. 2886-2896 ◽  
Author(s):  
F Barazandeh ◽  
S NazariNejad ◽  
RDB Nadafi ◽  
A Moobed MehdiAbadi ◽  
Z Ghasemi
Keyword(s):  
Biomedical Applications ◽  
Fabrication Method ◽  
Element Analysis ◽  
Fabrication Cost ◽  
Proper Size ◽  
Wide Range ◽  
The Finite Element Analysis ◽  
Genetic Algorithm Method ◽  
Artificial Fertilization ◽  
Silicon Based

This article presents the design and fabrication of a monolithic compliant microgripper. This research has mostly focused on the process of design, the finite element analysis, the fabrication method and use of a genetic algorithm method to solve the nonlinear kinematic equations and estimate the proper dimensions of the design. This new architecture of the microgripper enables it to apply a variable force to a wide range of micro-objects handled in microassembly, micromanipulation and also in biomedical applications such as artificial fertilization. The microgripper was designed to be normally open. Two shape memory alloy actuators close the jaws. To achieve the tasks, the most proper size has been considered to be 8 × 8 mm, with thickness of 250 µm. Polyethylene terephthalate has been used as the structural material. It is not brittle and is less sensitive to shock compared with silicon-based grippers; furthermore, its fabrication cost is less and it does not lose precision.

Finite Element Analysis of Ship Deck Sandwich Panel

2018 ◽  
Vol 874 ◽  
pp. 134-139 ◽  
Author(s):  
S.H. Sujiatanti ◽  
Achmad Zubaydi ◽  
A. Budipriyanto
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Sandwich Panel ◽  
Steel Structure ◽  
Core Material ◽  
Ship Structures ◽  
Element Analysis ◽  
Maximum Deformation ◽  
Resin Core ◽  
The Finite Element Analysis

Recently various types of sandwich panel are applied for constructing bridge and ship structures. Sandwich panel is material that consists of lightweight core material and two metal faceplates. The application of sandwich panel in ship structures makes the structure less-complex and ship’s selfweight lighter because of the reduction of secondary stiffeners. This paper discusses sandwich panel that was fabricated using synthetic resin core material and two steel faceplates. This study is aimed to analyze stresses developed in the sandwich panel of 750 GT Ro-Ro ship car deck structure when it was subjected to the deck design load. The finite element analysis was carried out to obtain the stress distribution and maximum deformation on the car deck structures. The stress of the ship car deck constructed using conventional steel structure, i.e. steel plate and stiffener, was compared with the stress of the deck that was built using sandwich panel.

Sign in / Sign up

Export Citation Format

Share Document