scholarly journals Effect of Epoxy Glass Fiber Reinforcement on Dynamic Characteristics of Sheet Metal Structure

2019 ◽  
Vol 8 (10) ◽  
pp. 2226-2230
Keyword(s):  
Glass Fiber ◽  
Sheet Metal ◽  
Dynamic Characteristics ◽  
Metal Structure ◽  
Element Analysis ◽  
Metal Structures ◽  
Industrial Structures ◽  
Glass Fiber Reinforcement ◽  
Structure Vibration ◽  
Metal Processing

Stamped sheets are widely used in automotive and industrial structures. Their stiffness and strength depends on various shapes in which they are stamped (trapezoidal, semi-circular). Epoxy glass fiber is widely used for replacing the actual components or by reinforcement. Reinforcement of this sheet metal structures with epoxy glass fiber will adhere its strength characteristics and also help in stiffing the structure. In order to use same shape of structure with high stiffness reinforcement of epoxy glass fiber can be used on that structure. Vibration of plates greatly depends upon various characteristics like aspect ratio, boundary condition and fiber orientation. The developed shape of structure after sheet metal processing and the thickness of the structure also contributes to its stiffness. Present study involves vibration analysis based on the geometry of the stamped sheets. Fixed – fixed boundary conditions are taking into the consideration, because Stamped sheets generally fails at fastened locations or welded locations. Modal analysis is performed to study dynamic characteristics of reinforced structures. In order to validate the experimental results Comparative analysis is carried out by using finite element analysis. Conclusions are drawn and suitable future scope is suggested

A New Approach for Optimization of Sheet Metal Components

2005 ◽  
Vol 6-8 ◽  
pp. 255-262 ◽  
Author(s):  
A. Albers ◽  
H. Weiler ◽  
D. Emmrich ◽  
B. Lauber
Keyword(s):  
Finite Element ◽  
Mathematical Programming ◽  
Sheet Metal ◽  
Optimization Method ◽  
Optimality Criteria ◽  
Body Parts ◽  
Bending Stress ◽  
Element Analysis ◽  
Metal Structures ◽  
Severe Difficulty

Beads are a widespread technology for reinforcing sheet metal structures, because they can be applied without any additional manufacturing effort and without significant weight increase. The two main applications of bead technology are to increase the stiffness for static loading conditions and to reduce the noise and vibrations for dynamic loadings. However, it is difficult to design the bead patterns of sheet metal structures due to the direction-controlled reinforcement effect of the beads. A wrong bead pattern layout can even weaken the properties of the structure. In the past, the designs were predominantly determined empirically or by the use of so called bead catalogues. Recently, different optimization approaches for bead patterns were developed, which are based upon classical mathematical programming optimization algorithms together with automatically generated shape basis vectors. However, these approaches usually provide only vague suggestions for the designs. One of the most severe difficulty with these approaches is to transfer the optimized results into manufacturable designs. Furthermore, another severe difficulty is that the optimization problem is non-convex, which frequently leads the mathematical programming algorithms into a local optima and thus to sub-optimal solutions. The investigations in this article show an optimization method, which within a few iterations leads to bead structures with excellent reinforcement effects using optimality criteria based approach. Generally, the results can be transferred without large effort into a final design. The new optimization method calculates the distribution of the bending stress tensor and the principal bending stresses based upon the results of a finite element analysis. The bead orientations are calculated by the trajectories of the principal bending stress with the largest magnitude. The beads are projected on to the mesh of the component using geometric form functions of the desired bead cross section. A local bead ratio of 50% (defined as average area of the beads in relation to total area of the sheet) is used by the algorithm to determine the maximum moment of inertia. The proposed algorithm is numerical implemented in the optimization system TOSCA and available for being applied with the following finite element solvers: ABAQUS, ANSYS, I-DEAS, NX Nastran, MSC.Nastran, MSC.Marc and PERMAS. The optimization algorithm is successfully applied to static and dynamic real world problems like car body parts, oil pans and exhaust mufflers. In the present work several academic and industrial examples are presented.

Dynamic Characteristics of a Micro-Sheet-Forming Machine System

2012 ◽  
Vol 504-506 ◽  
pp. 599-604 ◽  
Author(s):  
Yi Qin ◽  
Akhtar Razul Razali ◽  
Mei Zhou ◽  
Jie Zhao ◽  
Colin Harrison ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Dynamic Characteristics ◽  
Dynamic Performance ◽  
Thin Sheet ◽  
Sheet Forming ◽  
Element Analysis ◽  
Machine System ◽  
Micro Parts ◽  
Thin Sheet Metal ◽  
Tooling System

Dynamic characteristics of a micro-forming machine system are of significant importance to be considered if high-precision micro-parts are to be produced. This is because forming tolerances may be within a range of sub-microns up to 5-15% of the thickness of a thin sheet-metal (e.g. <100µm) being used in micro-sheet-forming. Achievability of the quality parts often vary with the machine-system performance and process parameters being set, and it largely depends on the understanding of the machine and tool system’s dynamic characteristics and effectiveness of the control of the machine and the process. Nevertheless, there has been lack of the effort in this field of research. Significant number of the efforts in this field were focused mainly on discrete and/slow processes where the dynamic characteristics of the forming systems were often neglected. This paper presents the dynamic characteristics of an autonomous micro-sheet-forming machine system and its effect towards the produced parts’ quality. These have been studied by combining finite element analysis and forming experiment, with a particular focus on the combined effects from the machine, tooling system and the sheet-metal feeding system (the strip feeder). The results showed that, besides importance of the dynamic performance of the machine and the tool-system, dynamic characteristics of the material-feeding plays an important part in determining the parts’ quality produced.

A 3D finite element analysis of glass fiber reinforcement designs on the stress of an implant-supported overdenture

2019 ◽  
Vol 121 (5) ◽  
pp. 865.e1-865.e7
Author(s):  
Guilherme Berger ◽  
Luiz Felipe de Oliveira Pereira ◽  
Evelise Machado de Souza ◽  
Rodrigo Nunes Rached
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Glass Fiber ◽  
Fiber Reinforcement ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Finite Element Analysis ◽  
Glass Fiber Reinforcement

A Novel Technique to Produce Metal Slurries for Semi-Solid Metal Processing

2006 ◽  
Vol 116-117 ◽  
pp. 366-369 ◽  
Author(s):  
J. Wannasin ◽  
R. Andy Martinez ◽  
M.C. Flemings
Keyword(s):  
Molten Metal ◽  
Systematic Study ◽  
Necessary Conditions ◽  
Metal Structure ◽  
Solid Metal ◽  
Metal Structures ◽  
Novel Technique ◽  
Metal Processing ◽  
A New Technique ◽  
Semi Solid

Various processing methods exist for applying agitation to a molten metal during solidification to obtain metal slurries suitable for semi-solid metal processing. . In this paper, a new technique to achieve semi-solid metal structure using agitation during solidification is reported. The technique applies a new medium and means to efficiently create semi-solid metal structures. The results of a systematic study showing the feasibility and the necessary conditions to achieve the structure are discussed.

Analysis of Vibration Diagnostic Methods of Metal Structures

2021 ◽  
pp. 16-23
Author(s):  
T.A. Pautova
Keyword(s):  
Residual Life ◽  
Dynamic Structure ◽  
Metal Structure ◽  
Crack Size ◽  
Diagnostic Methods ◽  
Element Analysis ◽  
Vibration Diagnostics ◽  
Metal Structures ◽  
Crack Location ◽  
Vibration Parameters

Due to the constant machine complexity increasing as well as the requirements imposed on them, the issue of ensuring their reliability is becoming more and more urgent. The main part of any machine is supporting metal structure, which state determines the state of the machine as a whole. This determines the need to diagnose structures in order to prevent failures. At present, the methods of vibration diagnostics are being widely developed, as applied to objects of various industries. Scientists’ research is aimed at studying various types of defects, vibration parameters, methods for detecting defects and assessing the residual life. The article considers the main current trends in the development of vibration diagnostics methods. The sensitivity of the dynamic structure characteristics to the presence of a defect in the form of a crack has been investigated. A finite element analysis of a steel I-beam was performed for various cases of its fixation and crack location. The dependence of the natural frequencies and amplitude-frequency characteristics of the beam on the crack size has been analyzed. It is found that the presence of a defect has the greatest effect on the frequency response of the beam.

Vibration and Noise Reduction Analysis of Sheet Metal Structures with Damping Layer

2015 ◽  
Vol 732 ◽  
pp. 291-296 ◽  
Author(s):  
Jan Petřík ◽  
Petr Kulhavý ◽  
Miloslav Pašek ◽  
Jakub Šašek
Keyword(s):  
Sheet Metal ◽  
Acoustic Noise ◽  
Vibration Reduction ◽  
Metal Structure ◽  
Vibration Energy ◽  
Material Models ◽  
Component Structure ◽  
Metal Structures ◽  
Damping Material ◽  
Separate Material

Vibration reduction in term of lower acoustic noise level increases e.g. the passenger comfort, fulfills acoustic manufacturing standards, decreases the transportation influence on the environment etc. The basic sheet metal structure is complemented with damping layer which absorbs the vibration energy. The frequency response experiment analysis of the component structure with damping material helps to validate the separate material models used for predictive simulations.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

Sign in / Sign up

Export Citation Format

Share Document