Testing of mechanical butt joints in composite structures

2021 ◽  
Vol 63 (9) ◽  
pp. 816-821
Author(s):  
Gurkan Altan
Keyword(s):  
Composite Structures ◽  
Numerical Data ◽  
Composite Plates ◽  
Butt Joint ◽  
Butt Joints ◽  
Element Analysis ◽  
Three Point Bending ◽  
Four Point Bending ◽  
Load Carrying ◽  
Geometric Changes

Abstract As the main contribution of the present study, an I-shaped joining element, which allows the plates used in large composite structures to be joined butt-to-butt, has been improved in terms of load capabilities. It is desirable that the joining zones of composite plates not be visible according to the design of composite structures and the requirements for the desired use in particular. In other words, it is not desirable to create any surfaces that would cause protrusions in the joining zones. The only joining technique that fulfils this condition is the butt joint. Generally, butt joints are performed by bonding. With this technique, it is possible to make a more durable mechanical butt joint using an I-shaped joining element. In this way, instead of bonding butt joints, stronger non-bonding or bonding mechanical butt joints can also be achieved. In this study, the geometric changes in the shape of an I-shaped joining element used in mechanical butt joints and the changes in load-carrying capabilities have been studied experimentally and numerically. Experiments were carried out with tensile, three-point bending and four-point bending tests. The experimental specimens and I-shaped joining elements were cut using a water jet machine. Abaqus finite element analysis software was used for numerical analysis. The numerical data obtained in the study were found to be consistent with the experimental data. The load-carrying capabilities of the joining elements of different geometric shapes were studied numerically and experimentally, and it was found that the ideal element was the joining element with a 60° angle.

Mixed Finite Element Analysis of Elastomeric Butt-Joints

2005 ◽  
Vol 129 (1) ◽  
pp. 11-18 ◽  
Author(s):  
P. A. Kakavas ◽  
G. I. Giannopoulos ◽  
N. K. Anifantis
Keyword(s):  
Finite Element ◽  
Strain Energy ◽  
Poisson Ratio ◽  
Mixed Finite Element ◽  
Three Dimensional ◽  
Butt Joint ◽  
Element Formulation ◽  
Butt Joints ◽  
Element Analysis ◽  
Strain Energy Density Function

This paper presents a mixed finite element formulation approximating large deformations observed in the analysis of elastomeric butt-joints. The rubber has been considered as nearly incompressible continuum obeying the Mooney/Rivlin (M/R) strain energy density function. The parameters of the model were determined by fitting the available from the literature uniaxial tension experimental data with the constitutive equation derived from the M/R model. The optimum value of the Poisson ratio is adjusted by comparing the experimentally observed diametral contraction of the model with that numerically obtained using the finite element method. The solution of the problem has been obtained utilizing the mixed finite element procedure on the basis of displacement/pressure mixed interpolation and enhanced strain energy mixed formulation. For comparison purposes, an axisymmetric with two-parameter M/R model and a three-dimensional (3D) with nine-parameters M/R model of the butt-joint are formulated and numerical results are illustrated concerning axisymmetric or general loading. For small strains the stress and/or strain distribution in the 2D axisymmetric butt-joint problem was compared with derived analytical solutions. Stress distributions along critical paths are evaluated and discussed.

Simulation of Low Velocity Impact Test on Carbon/Epoxy Composite Plates

2015 ◽  
Vol 1115 ◽  
pp. 523-526
Author(s):  
Ziamah B. Buang ◽  
S.M. Kashif
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Structures ◽  
Composite Plates ◽  
Matrix Cracking ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Element Analysis ◽  
Velocity Impact

Composite materials that have low weight and high strength properties are currently one of the promising materials for a vehicle’s body. However, the effect of low velocity impact on composite may cause failure through matrix cracking, fibre breakage and delamination which may reduce the structure strength. Low velocity impact can be analysed either by experimentation or numerical simulation. Numerical simulation which is also known as finite element analysis can show the degradation of the composite structure properties after an impact loading condition without doing any experimentation. Thus, in this paper, LS-DYNA is the finite element analysis software that is used to simulate a low velocity impact on composite structures.

scholarly journals Modeling Analysis of Guided Ultrasonic Waves in Composite Plates with Impact Damage

2018 ◽  
Vol 7 (4.26) ◽  
pp. 175
Author(s):  
Noorfaten Asyikin Ibrahim ◽  
Bibi Intan Suraya Murat
Keyword(s):  
Composite Structures ◽  
Impact Damage ◽  
Composite Plates ◽  
Guided Wave ◽  
Ultrasonic Waves ◽  
Fe Model ◽  
Element Analysis ◽  
Damage Area ◽  
Guided Ultrasonic Waves ◽  
The Impact

This paper investigates the propagation of guided ultrasonic waves and the interaction with impact damage in composite plates using a full three-dimensional Finite Element analysis. Impact damage in the composite plate was modeled as rectangular- and T-shaped delaminations. In order to provide guidelines for extending the modeling of realistic multimode impact damage, the impact damage was modeled as a combination of the delamination and reduced materials properties. The information obtained from these methods was compared to the experimental results around the damage area for a validation. There was a reasonable similarity between the experimental and FE results. The FE simulations can effectively model the scattering characteristics of the A0 mode wave propagation in anisotropic composite plates. This suggests that the simplified and easy-to-implement FE model could be used to represent the complex impact damage in composite plates. This could be useful for the improvement of the FE modeling and performance of guided wave methods for the in-situ NDE of large composite structures. 

Automating Structural Modeling of Composites Enriched by X-Ray Micro-Tomography and Digital Imaging Data

2018 ◽  
Author(s):  
Athanasios P. Iliopoulos ◽  
John G. Michopoulos ◽  
John C. Steuben ◽  
Andrew J. Birnbaum ◽  
Jim Lua ◽  
...  
Keyword(s):  
Digital Imaging ◽  
Composite Structures ◽  
Structural Modeling ◽  
Fiber Reinforced Polymers ◽  
Imaging Data ◽  
Element Analysis ◽  
X Ray ◽  
Four Point Bending ◽  
Recent Developments ◽  
Micro Tomography

The manufacturing processes of Fiber Reinforced Polymers (FRPs) as composite materials are frequently prone to the creation of various types of undesired morphologies and defects. These can include layer waviness, inclusions, and voids. Structural modeling for Finite Element Analysis (FEA) of structures including such morphologies and defects has not been practically realizable until recent developments in X-ray microtomography enabled the detection of such defects in a nondestructive manner. In the present work we present our initial steps toward the FEA modeling of FRP composite structures that leverage utilization of X-ray and regular digital imaging data as well as semi-automated methods for generating appropriate FEA models. Emphasis is given in defining waviness-driven curvilinear coordinate systems, defect identification and integration of both waviness and defects to FEA analysis including a planestrain application of a curved composite bracket under four-point bending conditions.

scholarly journals Finite Element Analysis of Honeycomb Sandwich Composite Structures With Various Joints

2021 ◽  
Vol 12 (1S) ◽  
pp. 531-535
Author(s):  
R.Karthikeyan, Et. al.
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Composite Structures ◽  
Sandwich Composite ◽  
Failure Strength ◽  
Ansys Software ◽  
Butt Joints ◽  
Element Analysis ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Composite

This work focuses on the numerical investigation of mechanical properties of aluminium honeycomb sandwich composite structures with lap and butt joints. The joints are bonded using adhesive, welded and bolted which were designed using CATIA software. The static and dynamic structural analyses were performed to compute the mechanical properties of aluminium honeycomb composite structures with various joints using ANSYS software. Finally, the models were developed for estimating the failure strength of joints in honeycomb sandwich composite structures.

Nonlinear Finite Element Analysis for the Flexural Behavior of Concrete Beams Strengthened with NSM CFRP-PCPs Composite Bars

2014 ◽  
Vol 584-586 ◽  
pp. 925-928
Author(s):  
Jiong Feng Liang ◽  
Ze Ping Yang ◽  
Ping Hua Yi ◽  
Jian Bao Wang
Keyword(s):  
Finite Element ◽  
Concrete Beams ◽  
Nonlinear Finite Element ◽  
Flexural Behavior ◽  
Load Carrying Capacity ◽  
Rc Beams ◽  
Element Analysis ◽  
Four Point Bending ◽  
Load Carrying ◽  
Bending Loading

This paper presents the development of a detailed 3D nonlinear finite element (FE) numerical model that can accurately predict the load-carrying capacity and response of RC beams strengthened with NSM CFRP-PCPs composite bars subjected to four-point bending loading. The predicted FE mid-span deflection responses agreed very well with the corresponding measured experimental tested data at all stages of flexural loading.

scholarly journals Damage Detection Performance of the Electromechanical Impedance (EMI) Technique with Various Attachment Methods on Glass Fibre Composite Plates

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1000 ◽  
Author(s):  
Rudy Tawie ◽  
Hee Beom Park ◽  
Jongdae Baek ◽  
Wongi S. Na
Keyword(s):  
Damage Detection ◽  
Glass Fibre ◽  
Composite Structures ◽  
Fibre Composite ◽  
Composite Plates ◽  
Detection Performance ◽  
Element Analysis ◽  
Electromechanical Impedance ◽  
Carbon Fibre Composites ◽  
Glass Fibre Composite

Composite materials such as glass and carbon fibre composites have become popular and the preferred choice in various applications due to their many advantages such as corrosion resistance, design flexibility, high strength and light weight. Combining materials with different mechanical properties make composites more difficult to evaluate where the damage mechanisms for composites are more complex than traditional materials such as steel. A relatively new non-destructive testing (NDT) method known as the electromechanical impedance (EMI) technique has been studied by various researchers, but the damage detection performance of the method on composite structures still requires more investigations before it can be accepted for field application, especially in aerospace industry due to the high standard of safety. In this paper, the detection capabilities and performance of the EMI technique subjected to different PZT attachment methods have been investigated. To this end, glass fibre composite plates with various attachment methods for the sensor have been prepared and detection of common defects such as delamination and crack with the EMI technique under study has been performed. The performance of each attachment method for identifying different damage types has been analysed and finite element analysis (FEA) was carried out for verification of the experimental results.

Finite Element Analysis of Centrally-Debonded Composite Sandwich Beam under Four Point Bending

2011 ◽  
Vol 335-336 ◽  
pp. 351-354 ◽  
Author(s):  
Meng Kao Yeh ◽  
Yu Wen Chiu
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Sandwich Structure ◽  
Sandwich Beam ◽  
Core Material ◽  
Sandwich Beams ◽  
Element Analysis ◽  
Specific Strength ◽  
Composite Sandwich ◽  
Four Point Bending

Sandwich structure, with high specific strength, high specific stiffness facesheet and light-weighted core material bonded together, is one of commonly used composite structures. During the manufacturing process, it is possible to have debonding between facesheet and core. This facesheet/core debonding affects the mechanical property and strength of sandwich structure. In this study, sandwich beams are made of graphite/epoxy laminate as facesheet and MWNTs/epoxy nanocomposites as core material. The composite sandwich beam, with a central facesheet/core debond and under four point bending, was analyzed by the finite element method. The length of the debonding layer, the fiber orientation of the facesheet laminate and MWNTs content in core were varied to assess their effects on the bending behavior and the strengths of the centrally-debonded sandwich beams.

Cold Bending Properties of Under-Matched Butt Joints for High Strength Steel

2012 ◽  
Vol 557-559 ◽  
pp. 1308-1312
Author(s):  
Jia Jie Wang ◽  
Zhi Bo Dong ◽  
Jing Qiang Zhang ◽  
Jian Guo Yang ◽  
Xue Song Liu ◽  
...  
Keyword(s):  
Finite Element ◽  
High Strength ◽  
Load Carrying Capacity ◽  
The Finite Element Method ◽  
Bending Properties ◽  
Butt Joints ◽  
Element Analysis ◽  
Cold Bending ◽  
Bending Load ◽  
Load Carrying

In this paper, cold bending properties of Q620-CF steel butt joints were analyzed based on the finite element method. Finite element analysis (FEA) results indicate that the flush under-matched butt joints have lower bending properties than the flush equal-matched butt joints, but under-matched butt joints with definite reinforcement shape can get greater bending force and better cold bending angles than the flush equal-matched butt joints. It shows that shape design of the reinforcement can improve the bending load-carrying capacity of under-matched joints. The reliability of the FEA has been verified by the experiment.

Sign in / Sign up

Export Citation Format

Share Document