scholarly journals Natural Frequency for a Composite Structure Made with a Combination of Metal and Laminated Composites

2020 ◽  
Vol 8 (6) ◽  
pp. 2340-2344
Keyword(s):  
Modal Analysis ◽  
Natural Frequency ◽  
Composite Structure ◽  
Laminated Composite ◽  
High Strength ◽  
Element Analysis ◽  
Volume Percentage ◽  
Steam Turbine Blade ◽  
Laminated Composite Beam ◽  
Natural Frequency Analysis

The need for low weight and high strength of the component is in high demand in various aerospace and defense industries and in line with this utilization of the combination of metal and composite increases. In this work, the natural frequency analysis of the structure, is carried out which is a combination of metal and composite. The natural frequency of the system is directly proportional to the stiffness of the system i.e. high natural frequency reflects high stiffness of materials. The structure considered like a cantilever beam, initially considering Titanium alloy the finite element analysis to get natural frequency carried out and validated using an analytical method. Then modal analysis performed using FEA for laminated composite structure and validate with the experimental results and received good agreement. The laminated composite beam manufactured using a hand layup method. Lastly, the structure modeled as a combination of laminated composite material & metal and FEA modal analysis done. The various volume percentage of composite and metal is studied and the best one finds out. The structure considered related to the last stage of the steam turbine blade.

scholarly journals Effect of lamination schemes on natural frequency and modal damping of fiber reinforced laminated beam using Ritz method

2021 ◽  
Vol 12 ◽  
pp. 15
Author(s):  
Somi Naidu Balireddy ◽  
Pitchaimani Jeyaraj ◽  
Lenin Babu Mailan Chinnapandi ◽  
Ch V.S.N. Reddi
Keyword(s):  
Natural Frequency ◽  
Ritz Method ◽  
Laminated Composite ◽  
High Strength ◽  
Fiber Reinforced ◽  
Modal Strain Energy ◽  
Modal Strain Energy Method ◽  
Modal Damping ◽  
Method Effects ◽  
Thin Beams

The current study focussed on analysing natural frequency and damping of laminated composite beams (LCBs) by varying fiber angle, aspect ratio, material property and boundary conditions. Ritz method with displacement field based on the shear and normal deformable theory is used and the modal damping is calculated using modal strain energy method. Effects of symmetric angle-ply and cross-ply, anti symmetric cross-ply, balanced and quasi-isotropic lay up schemes on modal damping are presented for the first time. Results revealed that influence of lay-up scheme on natural frequencies is significant for the thin beams while the modal damping of the thin beams are not sensitive to lay-up scheme. However, the lay-up scheme influences the damping significantly for the thick beams. Similarly, high strength fiber reinforced LCBs have higher natural frequency while low strength fiber reinforced LCBs have higher damping due to the better fiber-matrix interaction.

scholarly journals Geometrical behavior of laminated graphite/epoxy composite using hypermesh

2018 ◽  
Vol 7 (2.20) ◽  
pp. 214
Author(s):  
Ch Siva RamaKrishna ◽  
KV Subba Rao ◽  
Saineelkamal Arji
Keyword(s):  
Residual Stresses ◽  
Epoxy Composite ◽  
Weight Ratio ◽  
Laminated Composite ◽  
High Strength ◽  
Element Analysis ◽  
Aspect Ratios ◽  
Military Applications ◽  
Inherent Strength

The laminated composite material is  made of ply which are specically used in automotive, aerospace and military applications due to less in weight and high strength to weight ratio. The role of structural strength is very important in composites, as the material is weak in inherent strength leads to damage of equipment made with the laminated composite. Hence, an accurate understanding of their structural geometrical behavior for residual stresses is required, such as residual stresses with different aspect ratios. In present work, various aspect ratios of laminated composite and its residual stresses are investigated using finite element analysis. The numerical results showed, on the residual stresses, that the effects the change the residual stresses due change of aspect ratio of laminated Graphite/epoxy composite. 

Multiscale Modeling of a Notched Coupon Test for Triaxially Braided Composites

2019 ◽  
Vol 795 ◽  
pp. 172-179
Author(s):  
Yan Qi Hu ◽  
Wieslaw K. Binienda
Keyword(s):  
Multiscale Modeling ◽  
Large Scale ◽  
Laminated Composite ◽  
High Strength ◽  
Multiscale Model ◽  
Tensile Tests ◽  
Local Deformation ◽  
Modeling Method ◽  
Braided Composites ◽  
Element Analysis

Braided composites have been widely used in aerospace and automotive structures due to their light weight and high strength. Unlike metal or laminated composite material, the complex braided structure brings a lot of challenges when conducting numerical simulation. In this paper, a finite element analysis based meso-mechanical modeling for the two dimensional triaxially braided composite was developed. This mesoscale modeling method is capable of considering the detailed braiding geometry and architecture as well as the mechanical behavior of fiber tows, matrix and the fiber tow interface. Furthermore, a multiscale model combined both macroscale and mesoscale approaches and it is realized within LS-DYNA environment through Interface_components and Interface_linking. This combined multiscale modeling approach enables the full advantage of both the macroscale and mesoscale approaches, which can describe the details of local deformation and the global overall response features of the entire structure with the minimum computational expense. The evaluation and verification of the mesoscale approach and combined multiscale modeling method is through a notched coupon tensile tests conducted by Kohlman in both axial and transverse direction. The multiscale modeling method captures the response feature accurately so it has the ability to analyze large scale structures.

Free Vibration of Laminated Composite Beams and Plates Using ADINA Finite Element Code

1995 ◽  
Author(s):  
James Stolte
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Laminated Composite ◽  
Shell Element ◽  
Composite Beams ◽  
Advanced Technology ◽  
Finite Element Code ◽  
First Order ◽  
Natural Frequency Analysis ◽  
Laminated Composite Beams

Abstract Composite materials are being investigated in advanced technology test beds for use in future armored vehicles. We are particularly interested in the response to impulsive loading for which the knowledge of natural frequency behavior is important. In this paper, we investigate the natural frequency analysis capabilities of the multilayered shell element of the ADINA finite element code as applied to laminated composite beams and plates. Results are compared to those published in the literature or those derived from exact solutions. The ADINA shell element employs a first-order shear deformation theory, and the results are found to agree well with other first-order theories. Although ADINA does not allow for a direct method of incorporating a shear correction factor commonly used in first-order theories, it is demonstrated how this can be included by modifying the material properties.

Predicting the Natural Frequency of Train Structures Using Detailed Finite Element Models

2016 ◽  
Author(s):  
Robert A. MacNeill ◽  
Glenn Gough
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Natural Frequencies ◽  
Holistic Approach ◽  
Light Rail ◽  
Element Analysis ◽  
Fea Model ◽  
High Level ◽  
Structural Mass

Train carbody and truck structures are designed to exhibit primary natural frequency modes great enough to avoid unwanted resonant oscillations with normal track interactions. Critical bounce modes can be excited by typical track in the 2–4 Hz range. Trains are designed with first modes above this threshold. Historically, simplified approaches are employed to predict natural frequencies of the main truck and carbody train structures independently. Since the advent of high powered computing, more detailed finite element analysis (FEA) eigenvalue approaches have been used to more accurately predict natural frequency of structures. Still, the typical FEA approach uses simplified boundary conditions and partial models to determine natural frequencies of individual components, neglecting the interaction with other connected structures. In this paper, a detailed, holistic approach is presented for an entire Light Rail Vehicle (LRV). The analysis is performed on a fully detailed FEA model of the LRV, including trucks and suspension, carbody structures, non-structural mass, articulation, as well as intercar and truck-carbody connections. The model was developed for detailed crashworthiness investigations, which requires a high level of fidelity compared to what is typically required for static and modal analysis. Using the same model for multiple purposes speeds up development while also improving the accuracy of the analyses. In this paper, the modal analysis methodology developed is described. A case study is presented investigating the often neglected contribution of windows, cladding, and flooring on the overall carbody natural frequency.

Experimental verification of detection and prediction of multiple cracks by vibrations, FEM and ANN

2014 ◽  
Vol 10 (3) ◽  
pp. 290-303
Author(s):  
Prasad Ramchandra Baviskar ◽  
Vinod B. Tungikar
Keyword(s):  
Modal Analysis ◽  
Natural Frequency ◽  
Crack Detection ◽  
Vertical Plane ◽  
Multiple Cracks ◽  
Transverse Cracks ◽  
Content Type ◽  
First Case ◽  
Natural Frequency Analysis ◽  
Good Agreement

Purpose – The purpose of this paper is to address the determination of crack location and depth of multiple transverse cracks by monitoring natural frequency and its prediction using Artificial Neural Networks (ANN). An alternative to the existing NDTs is suggested. Design/methodology/approach – Modal analysis is performed to extract the natural frequency. Analysis is performed for two cases of cracks. In first case, both cracks are perpendicular to axis. In second case, both cracks are inclined to vertical plane and also inclined with each other. Finite element method (FEM) is performed using ANSYSTM software which is theoretical basis. Experimentation is performed using Fast Fourier Transform (FFT) analyzer on simply supported stepped rotor shaft and cantilever circular beam with two cracks each. Findings – The results of FEM and experimentation are validated and are in good agreement. The error in crack detection by FEM is in the range of 3-15 percent while 5-20 percent by experimentation. The database obtained by modal analysis is used to train the network of ANN which predicts crack characteristics. Validity of method is investigated by comparing the predictions of ANN with FEM and experimentation. The results are in good agreement with error of 7-16 percent between ANN and FEM while 9-21 percent between ANN and experimental analysis. Originality/value – It envisages that the method is capable. It is an effective as well as an alternate method of fault detection in beam/rotating element to the existing methods.

Strength Design for Star Sprocket Based on ANSYS

2014 ◽  
Vol 635-637 ◽  
pp. 312-315
Author(s):  
Lin Hong ◽  
Ying Jie Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Dynamic Optimization ◽  
Natural Frequencies ◽  
Analysis Software ◽  
Optimization Analysis ◽  
Element Analysis ◽  
Chain Conveyor

A star sprocket is an important component of U-shaped slide chain conveyor, so it is particularly important to be analyzed. It conducts modal analysis of star sprocket by using large finite element analysis software, ANSYS, calculates natural frequencies of the first five and the corresponding modes and analyzes natural frequency affected by sprocket tooth thickness. The result provides basic theory for dynamic optimization analysis of U-shaped slide chain conveyor.

The Finite Element Analysis of the Wind Turbines's Rotary Support

2011 ◽  
Vol 347-353 ◽  
pp. 1276-1280
Author(s):  
Hong Liang Hu ◽  
Rui Jie Wang ◽  
Chun Ling Meng ◽  
Guo Feng Li
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Static Analysis ◽  
Theoretical Basis ◽  
Dynamic Performance ◽  
Element Analysis ◽  
The Finite Element Analysis

Abstract. Combining characteristic of the Wind Tturbines's rotary support, using finite element method, the paper probe the rotary support finite element analysis of static and modal analysis. Through the static analysis of the rotary support, receiving the deformation and stress-strain results; through modal analysis,receiving the 6-order natural frequency and vibration shape.Analyzing of the main failure forms and Dynamic performance ,the results provide a theoretical basis of improvement of the design and to finalize the program.

scholarly journals Finite element analysis of bolt shear connection of steel-concrete composite structure

2020 ◽  
Vol 198 ◽  
pp. 01027
Author(s):  
Zhishun Pan
Keyword(s):  
Finite Element ◽  
Composite Structure ◽  
Composite Structures ◽  
Mechanical Performance ◽  
Concrete Strength ◽  
High Strength ◽  
Shear Capacity ◽  
Simulation Software ◽  
Element Analysis ◽  
Shear Connectors

Bolted shear connectors are an important component to ensure that steel-concrete composite structures can work together. High-strength bolt shear connectors can replace traditional stud connectors because of their disassembly, good mechanical performance and fatigue resistance. It applied to steel-concrete composite structure. In order to study the influencing factors of the bearing capacity of high-strength bolted shear connectors, this paper uses ABAQUS finite element simulation software as a research tool to establish a reasonable finite element model to study the influence of bolt strength, bolt diameter and concrete strength on bolted shear connectors. Studies have shown that increasing the diameter, strength, and concrete strength of bolted connections can effectively increase the bolt’s shear capacity.

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