IRJET-Vibration Analysis of Adhesively Bonded Single Lap Joint (original) (raw)

Investigation of Dynamic Response of a Single Lap Adhesive Bonded Joint

International Journal of Advance Research and Innovative Ideas in Education, 2015

The aim of this paper is to study the modal analysis to analyze the dynamic behavior of single lap adhesive joint subjected to impact or shock loads using Finite Element Analysis (FEA) and experimental analysis. In this paper modal analysis of bonded beams with a single lap adhesive joint is investigated. The various factors that affect the response of adhesive joint structures are studied, such as natural frequencies, mode shapes, damping ratio etc.. The finite element analysis software ANSYS 13.0 is used for modal analysis of a specimen. The material used for the specimen is aluminum and adhesive used for lap joint is araldite epoxy adhesive. The initial case study is focused on software modal analysis of cantilever beam subjected to impact load. The main objective of this paper is to determine the natural frequency and mode shape of a single lap adhesive joint at cantilever beam condition and to compare the results obtained by finite element analysis with experimental results and...

Experimental and Analytical Investigations of the Dynamic Response of Adhesively Bonded Single Lap Joints

Journal of Vibration and Acoustics, 2004

Dynamic response of single lap joints, subjected to a harmonic peeling load is studied theoretically and experimentally. In the theoretical part, dynamic response of a single lap joint clamped at one end and subjected to a harmonic peeling load at the other end is investigated. Adherents are modeled as Euler-Bernouli beams joined in the lap area by a viscoelastic adhesive layer. Both axial and transverse deformations of adherents are considered in deriving the equations of motion. The effects of adhesive layer thickness, mechanical properties and its loss factor on the dynamic response of the joint are investigated. Furthermore, effects of defects such as a void in the lap area on the dynamic response of the joints are studied. The results showed that frequencies where peak amplitudes occurred were little dependent on the adhesive loss factor. However, peak amplitudes reduced for joints with a higher adhesive loss factor. Furthermore, the results indicated that for the joint geometries and properties investigated the system resonant frequencies were not affected by the presence of a central void covering up to 80% of the overlap length. In the experimental part, single lap joints were fabricated using 6061-T6 Aluminum. Adherents were joined together using Hysol EA 9689 adhesive film. Joints with various central voids were manufactured by removing adhesive film from the desired area of lap joints prior to bonding adherents. Dynamic responses of the joints were investigated using the hammer test technique. The system response was measured using both an accelerometer and a noncontact laser vibrometer. The natural frequencies of the joints obtained by using the laser vibrometer were very close to those obtained theoretically. However, natural frequencies obtained by using an accelerometer depended on the accelerometer location in the system, which was attributed to its mass contribution to the overall system mass. A central void covering less than 80% of the overlap length had little effect on the system resonance frequencies. This was in agreement with the theoretical results. In contrast total system-damping ratios were a function of the void size. Joints without a void exhibited higher damping.

Vibration analysis of adhesively bonded lap joint, part I: Theory

Journal of Sound and Vibration, 1992

An analytical model to study the coupled transverse and longitudinal vibration of a bonded lap joint system is described in this paper. The system consists of a pair of parallel and identical beams which are lap-jointed over a certain length by a viscoelastic material. The unjointed ends of the beams are assumed to be simply supported. The governing equations of motion for the forced vibration of the system under transverse distributed loads are derived using the energy method and Hamilton's principle. Both shear and thickness deformation in the adhesive layer is included in the analysis. The theoretical development of the model is presented in this paper. The numerical solutions of the governing equations for free vibration along with boundary and continuity conditions yield the system natural frequencies, loss factors and mode shapes. The details of the numerical solution scheme and results for free vibration are included in the accompanying paper. 405 0022-460X/92/030405 + 12 $03.00/O

Investigation of vibration modes of a double-lap bonded joint

SN Applied Sciences

The authors were concerned in this work in examining the influence of many mechanical and geometrical parameters on the mode shapes of vibration of a double-lap bonded joint. The parameters varied in this study were: adhesive Young's modulus, adhesive and adherents' thicknesses and overlap length. The substrates were made from steel; the adhesive is an epoxy resin. The study was carried out using ANSYS Finite Element software where the first ten modes were extracted. The results obtained from an experimental test conducted by the same workgroup were used to validate the numerical results. Based on the numerical parametric study, the results have shown a dominant influence of the substrates' thickness and the overlap length: the natural frequency increases remarkably with those two parameters. Moreover, the frequencies of the first ten modes were found to be very sensitive in increasing with the increment of either the adherents' thicknesses or the overlap length. On the other hand, the influence of the adhesive Young's modulus was found to be very slight on increasing the natural frequencies for all modes while the adhesive thickness was found to have quite no influence for the first couple of modes, with a slight decrement of frequency for higher modes. Finally, by setting the latter parameters to reference values, a unified parameter function of overlap length and adherent thickness was defined and approximated, and analytical relations for natural frequencies of the first ten modes were established. Keywords Modal analysis • Adhesive • Double-lap joint • Finite element List of symbols a Overlap length (mm) L Length of plates (mm) E Adhesive Young's modulus (GPa) t a Adhesive thickness (mm) t c Central plate's thickness (mm) t e Exterior plates' thickness (mm) W Structure width (mm) ω Natural frequency of the structure (Hz)

Analytical, Numerical and Experimental Analysis of the Vibrational Behaviour of Adhesively Composite Double-Lap Joints

2019

In this paper an analytical model based on finite element energy formulation that calculates free vibration frequencies of cantilevered-free laminated double lap bonded joints is established. 8-noded serendipity element with quadrature Gaussian formula was adopted. This model was validated using 3D finite element model through ANSYS Workbench. The results have shown good agreement for steel and composite while it was not the case for polymeric substrates. Moreover, an experimental procedure for analysing the vibrational response of adhesively composite double lap joints is presented in this paper. The Impulse Excitation Technique (IET) has been adopted in order to measure the resonant frequencies. Two types of substrates were examined: steel and orthotropic glass-polypropylene composite and the adhesive used is a resin/epoxy constituent. Three different substrates thicknesses and three different overlap lengths were examined. Then, the experimental results were compared with numeric...

VIBRATION ANALYSIS OF THREE PARAMETER MODEL OF ADHESIVELY BONDED JOINTS

An analytical model to study the coupled transverse and longitudinal vibrations of a single lap adhesive joint is proposed in this paper which includes partial differential form of the motion equations. A balanced single lap adhesive joint consist of two identical adherents of mild steel which are lap jointed over a certain length by a viscoelastic material, epoxy resin(araldite). Adherents are modeled as Euler-Bernoulli Free-Free beam. Both transverse and axial deformation of adherents, shear and peel stresses at the adhesive joint interface and deflection of mid plane of adhesive layer (3-parameter model) is considered in deriving the equations of motion. The classical two parameter elastic foundation model violates the equilibrium condition of the adhesive layer; to eliminate this flaw, a new three parameter elastic foundation model is considered which satisfies the equilibrium condition of the adhesive layer. The governing equations of motions are derived for three parameter elastic foundation model. The numerical solutions of the governing equations for free vibrations yield the system natural frequency. Experimentation carried out on both monolithic and adhesively jointed beam to observe the effect of joint. The effect of thickness of adhesive and joint overlap ratio on system natural frequencies are investigated.

Effects of various parameters on dynamic characteristics in adhesively bonded joints

Materials Letters, 2004

Adhesively bonded lap joints are used extensively in various industries. Some disadvantages like holes, thermal effects occurring in the bolted, welded, riveted, and soldered joints are not in question in adhesively bonded joints. Strong adhesive materials used in bonding have been greatly developed in recent years, and then the properties of lightness, sealing, corrosion resistance, heat and sound isolation, damping, and quickly mounting facility have been highly improved. In this work, effects of various dynamic characteristics in the adhesively bonded joints subjected to dynamic forces are investigated using the finite element method. The investigation is conducted on a three-dimensional model. The finite element model of the joint is obtained using isoparametric three-dimensional elements having eight nodes with three degrees of freedom each. Mesh generation is accomplished automatically in a computer.

Free vibration analysis and optimal design of an adhesively bonded double containment cantilever joint

Journal of Scientific & Industrial Research, 2008

This study presents three-dimensional free vibration and stress analyses of an adhesively bonded double containment cantilever joint. Modulus of elasticity, Poisson's ratio and density had negligible effect on natural frequencies and mode shapes of adhesive joint. ANN models predicted that support length and plate thickness played important role on natural frequencies, mode shapes and modal strain energy of adhesive joint whereas adhesive thickness has a minor effect. Genetic Algorithm combined with ANN model determined optimum geometrical dimensions, which are satisfying maximum natural frequency and minimum elastic modal strain energy conditions for each natural frequency and mode shape of the adhesively bonded double containment cantilever joint.

Evaluation of Dynamic Parameters of Adhesively Bonded Steel and Aluminum Plates

2012

Weight reduction remains one of the key factors for various industries. Inevitably this will result in multi-material designs where the most appropriate material is selected for each part. A key enabler for such a multimaterial design is joining two materials with optimized weight which is balanced with the need to keep manufacturing costs down. Further, it is well known that these parts are subjected to dynamic load while in service conditions, and in order to evaluate dynamic parameters for design purpose an adhesively bonded dissimilar joint between Aluminium and Mild steel plates has been investigated experimentally through traditional “strike method” of modal testing. FE simulation is also carried out and are compared with experimental results and found to be in good agreement.

Comparison of Static Analysis of Bonded, Riveted and Hybrid Joints by using Different Materials

The two different materials with varying thicknesses are need to be join for the various application areas like aerospace, automobile, robotics, etc. Because of the superior properties, the composite materials have been widely used in many fields as structural element. Aircraft structure is a huge assembly of frames skins, parts, etc. A load transmission path is formed by structure which is an assembly of sub-structure connected and arranged properly. Such load transmission path is achieved by using joints. As the joints constitute weakest zones in the structure, failure may occurs at the joint due to various reasons such as deflection in excess, stress concentration near the joint area or combination of both. Therefore we need to understand the stress distribution at the joint area and strength of materials for utilize the whole potential of composites, so that the suitable material and joint can be chosen for various application fields. Manufacturing of the composite joints (bonded, riveted and hybrid), Modeling, and static analysis of 3D models were carried out using FEA software (ANSYS). The results were interpreted in terms of Von Misses stress. Various joint like bonded, riveted and hybrid joint were prepared by glass fibre, and then undergo in Universal Testing Machine for tensile test. The results of FEA software and experimental work were then compared with the joints. The Best Joint is recognized and suggested by their load Carrying Capacity.