Experimental Analysis for Damping Effect Of Laminated Composite Plate

Transcription

1 ISSN Experimental Analysis for Damping Effect Of Laminated Composite Plate #1 Mr. C.M.Chaudhari, #2 Prof. Dr. R. B. Barjibhe 1 chetanchaudhari1992@gmail.com 2 rahulbarjibhe@yahoo.com #1 PG Student, Department of Mechanical Engineering #2 Professor, Department of Mechanical Engineering, S.S.G.B.C.O.E. Bhusawal, North Maharashtra University,Jalgaon ABSTRACT Now- a-days Composite or Laminated Materials are widely used in Automobile as well as Aerospace purpose due to their comparatively high mechanical properties. Vibrations are present in more amounts in the dampers so is important to eliminate or reduce the vibration. For this purpose the vibration analysis is to be done. In the work area of vibration analysis we wish to develop an efficient model correction approach for resonant systems that are obtained from model analysis and approximate methods. Model correction for point-wise would be considered.an attempt is to be made to reduce the vibration by analyzing different composite plates also for the different structures. Keywords: Composite, Laminated plates, Vibration ARTICLE INFO Article History Received: 22 nd January 2017 Received in revised form : 22 nd January 2017 Accepted: 24 th January 2017 Published online : 27 th January 2017 I. INTRODUCTION Composite structure and plates are common place in many automotive sectors and aircraft industries. they are used due to high potential for improve strength. In this project work prediction of natural frequencies is to be done on laminated composite materials as consider they design against failure due to various types of static and dynamic loads.the composite material Are widely used in many field due to lighter, rust free, temperature resistance, stronger and wear resistance. II. PROBLEM DEFINITION The metals plates used in services today in more and more extent in automobile and aeronautical industries and forms a vibration, due to vibration ultimately results in generation of cracks, Vibration causes rapid/excessive wear of machine parts such as bearings and gears and sometimes excessive vibrations are dangerous for health of human beings so Main purpose of that project is to reduced the effect of vibration. III. LITERATURE REVIEW Oscar Barton, studied that composite beam, plates, and shells, are commonplace in many sectors of the automotive and aircraft industries. Use of such structures is now being cw side & for off-shore and naval applications because of the potential for improved strength to weight ratio and resistance to harsh environments. This paper considers the theoretical and experimental modal analysis of a thick sandwich plate, approximately 20 feet by six feet. This plate is a scale model of a new design for a ships deck. In service, it is the fundamental mode that is normally most pmblematic for a ships deck. Results are presented horn an experimental modal analysis with the plate suspended on rubber bungee cords. Sourabha S. Havaldar(2012), studied that the effect of hexagonal cell size of the core on the fundamental natural frequency of FRP honey-comb sandwich panels has been analyzed both experimentally and by finite element technique. Experimental Modal tests were conducted on hexagonal cell honeycombs ranging in size from 8 mm to 20 mm maintaining the facing thick-ness constant at around 1 mm with two different boundary conditions viz C-F-F-F and C-F-C-F. The traditional strike method has been used to measure the vibration properties. The modal characteristics of the specimens have been obtained by studying its impulse response. Each specimen has been subjected to impulses 2016, IERJ All Rights Reserved Page 1

2 through a hard tipped hammer which is provided with a force transducer and the response has been measured through the accelerometer. The impulse and the response are processed through a computer aided FFT Analyzing test system in order to extract the modal parameters with the aid of software. V. INITE ELEMENT MODELLING 1) for aluminum plate IV. EXPERIMENAL ANALYSIS The complete experimental setup for vibration analysis is shown in figure. In order to obtain natural frequencies of mild steel, aluminium and rubber plates. The values of natural frequencies obtained by exciting the handle bar using Impact Hammer shown in figure and measuring the response by an Accelerate meter which was connected to FFT Analyzer with two steps. Step 1) to obtain natural frequencies of mild steel, aluminium and rubber plates. Step 2) construct the sandwich structure snd find the natural frequencies for simply supported condition. Plate specification There are three plates used in this research and their specification are as follows- Material- 1)Aluminium; 2) Mild Steel ; 3)Rubber Length of plate: 270 mm, width of plate: 150 mm and thicknesss: 6 mm. Result of experimental work for natural frequency at mode shape. 2) For mild steel plate 2016, IERJ All Rights Reserved Page 2

3 4) For Al-Al-Al Structured Plate 3) For Rubber plate 2016, IERJ All Rights Reserved Page 3

4 6) For AL- RUBBER -AL COMPOSITE STRUCTURE 5) For MS-MS-MS STRUCTURED PLATE 2016, IERJ All Rights Reserved Page 4

5 7) For MS - RUBBER - MS COMPOSITE STRUCTURE VI. RESULT TABLE OF FEA SOFTWARE FOR NATURAL FREQUENCY VII. CONCLUSION In this study the natural frequencies are determine for different material plates. It is found that laminated structure are better in damping effect by simply supported condition from above work of laminated composite structure it is clear that ms-ru-ms laminated composite structure is better in damping effect. REFRENCES [1] Chih-Cherng Chen & Ko-Ta Chiang, Analyzing the design of vibration reduction with the rubber-layered laminates in the precision turning with a diamond cutting tool, Int J Adv Manuf Technol (2011) 57: , Received: 10 October 2010 / Accepted: 17 March 2011 / Published online: 6 April [2] Dong Shao, Transient response analysis of cross-ply composite laminated rectangular plates with general boundary restraints by the method of reverberation ray matrix, Shanghai Marine Equipment Research Institute, Shanghai, PR China, Received Date: 22 January 2016/ Accepted Date: 10 May , IERJ All Rights Reserved Page 5

6 [3] Oscar Barton, Jr and Colin P. Ratcliffe, Modal Analysis Of A Thick Sandwich Plate A Comparison Between Theory And Experiment, Mechanical Engineering Department United States Naval Academy, [4] Sourabha S. Havaldar1, Ramesh S. Sharma1, Arul Prakash M. D. Antony2, Mohan Bangaru2, Effect of Cell Size on the Fundamental Natural Frequency of FRP Honeycomb Sandwich Panels, Journal of Minerals and Materials Characterization and Engineering, 2012, 11, , IERJ All Rights Reserved Page 6