Experimental Research and Finite Element Analysis on the Bonding Behavior of CFRP-Concrete Interface

2012 ◽  
Vol 204-208 ◽  
pp. 1109-1117
Author(s):  
Hui Peng ◽  
Shu Yu Yu ◽  
Chun Sheng Cai ◽  
Wei Wei Liu
Keyword(s):  
Finite Element ◽  
Mechanical Behavior ◽  
Failure Mode ◽  
Adhesive Layer ◽  
Element Model ◽  
Test Results ◽  
Element Analysis ◽  
Double Shear ◽  
Bonding Length ◽  
Concrete Interface

The bonding behavior of CFRP-concrete interface has important influence on the mechanical behavior and the failure mode of the strengthened structure. In this paper, a total of 4 specimens strengthened with CFRP plate were prepared and the double-shear tests were conducted to investigate the mechanical behavior and the failure mode of the CFRP-concrete bonding. During the tests, the on the ultimate bearing capacity and the distribution of the CFRP strains were measured and the influence of bonding lengths and thickness of the epoxy were discussed. According to the test results, the distribution of the CFRP strain along the bonding length shows an exponential decreasing law, and the strain in the vicinity of the loading position was much greater than that at the ends. Based on the test data, the finite element model of the specimens was developed, by using the orthotropic spring elements to simulate the adhesive layer with ANSYS software. The comparison of the analytical results and the experimental results indicates that both results have shown a good agreement.

Reelability Assessment of Adhesively Bonded Mechanically Lined Pipe

2021 ◽  
Author(s):  
Grégory Alexandre Toguyeni ◽  
Jens Fernandez-Vega ◽  
Richard Jones ◽  
Martin Gallegillo ◽  
Joachim Banse
Keyword(s):  
Finite Element ◽  
Adhesive Layer ◽  
Element Model ◽  
Curing Temperature ◽  
Sensitivity Analyses ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Physical Test ◽  
Weld Overlay ◽  
Outer Pipe

Abstract A solution to prevent liner wrinkling in Mechanically Lined Pipes (MLP) with a standard 3.0mm thick liner during reeling, without the use of pressurisation, has been developed in the form of the GluBi® lined pipe. The liner being adhesively bonded to the outer pipe, its integrity is maintained despite the global plastic strain applied by the installation method. This new linepipe product has been qualified for offshore use through testing accompanied by a detailed Finite Element Analysis programme to fully capture the pipe and adhesive behaviours under and range of temperatures and loading conditions. The objective of this analysis program was to investigate the reelability of the GluBi® pipe. The instalability was defined as the capability of the pipe to tolerate cyclic plastic deformation representative of a typical pipeline installation by reeling without the formation of wrinkling of the CRA liner, and to maintain the integrity of the adhesive layer, particularly near the weld overlay at the pipe ends. Important areas of the GluBi® pipe design are the pipe extremities, particularly the transition between the liner and the weld overlay length. A detailed Finite Element model of the pipe was created. It captured all stages of the pipe manufacturing: pipe lining, hydrostatic expansion, adhesive curing, overlay weld deposition and reeling simulation. The pipe modelled was 312.1mm OD × 19.7mm WT SMLS 450 with a nominal 3.0mm thick Alloy 625 liner. An important validation work was performed to obtain a precise material response of the adhesive layer between liner and outer pipe. The adhesive mechanical properties were thus assessed in shearing and peeling over a range of temperatures covering all possible manufacturing and installation conditions. The model's elements and adhesive property modelling were validated against physical test results. Sensitivity analyses were done on the adhesive curing temperature, the geometry of the adhesive transition between the liner and the overlay weld at the pipe ends and on the liner thickness. The model was subjected to reeling simulation corresponding to Subsea 7's reel-lay vessels. The liner's integrity post reeling was assessed according to a range of acceptance criteria. These studies made it possible to establish parameter ranges for the safe installation of the linepipe.

Finite Element Modeling of Effect of Adhesive Layer and Carrier Thickness Used for Strain Gauge Mounting

2015 ◽  
Vol 1119 ◽  
pp. 828-832
Author(s):  
K. Vadivuchezhian ◽  
K. Subrahmanya ◽  
N. Chockappan
Keyword(s):  
Finite Element ◽  
Strain Gauge ◽  
Adhesive Layer ◽  
Element Model ◽  
Strain Gauges ◽  
Single Element ◽  
Metal Foil ◽  
Engineering Structures ◽  
Element Analysis ◽  
Typical Strain

Metal foil strain gauges are most widely used for the stress analysis in engineering structures. Typical strain gauge system includes strain sensitive grid, carrier material, and adhesive layer. Strain measurement from the strain gauge is partially affected by carrier and adhesive materials and their thickness. In the present work, a Finite Element Model is developed in order to study the effect of both adhesive layer and carrier thickness on strain measurements while using strain gauges. To understand the behavior of the adhesive material, mechanical characterization is done on bulk adhesive specimen. Finite Element Analysis (FEA) is carried out with different materials namely epoxy and polyurethane. Initially a single element foil loop is considered for the analysis and further this is extended to metal foil strain gauge with nine end-loops. Finally, the strain variation through thickness of adhesive layer, carrier and strain sensitive grid is obtained from FEA. The results thus obtained are compared with analytical results from Basic Strength of Materials approach.

An Analysis of Thermo-Mechanical Behavior in a Multilayer Composite Pipe Under Temperature Variation

2010 ◽  
Author(s):  
Wei Yang ◽  
Jyhwen Wang
Keyword(s):  
Finite Element ◽  
Thermal Stress ◽  
Analytical Solution ◽  
Mechanical Behavior ◽  
Temperature Change ◽  
Thermal Stresses ◽  
Element Model ◽  
Functionally Graded ◽  
Element Analysis ◽  
Graded Materials

A generalized analytical solution of mechanical and thermal induced stresses in a multi-layer composite cylinder is presented. Based on the compatibility condition at the interfaces, an explicit solution of mechanical stress due to inner and outer surface pressures and thermal stress due to temperature change is derived. A finite element model is also developed to provide the comparison with the analytical solution. It was found that the analytical solutions are in good agreement with finite element analysis result. The analytical solution shows the non-linear dependency of thermal stress on the diameters, thicknesses and the material properties of the layers. It is also shown that the radial and circumferential thermal stresses depend linearly on the coefficients of thermal expansion of the materials and the temperature change. As demonstrated, this solution can also be applied to analyze the thermo-mechanical behavior of pipes coated with functionally graded materials.

Finite Element Analysis of Stiffness of Steel Plate with a Rectangular Cutout Bonded by Composite Patches

2013 ◽  
Vol 377 ◽  
pp. 3-7
Author(s):  
Ze Long You ◽  
Xiang Ming Zhang ◽  
Kui Du
Keyword(s):  
Finite Element ◽  
Steel Plate ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Shell Element ◽  
Element Model ◽  
Element Analysis ◽  
Spring Element ◽  
Bonded Repair ◽  
Spring Plate

An ANSYS-based "volume-spring-plate" three-dimensional finite element model is established in this paper to analyze steel plate with a rectangular hole reinforced by double-side bonding patch, in which the plate is simulated by solid45 8-node 3D element, the adhesive layer is simulated by linear elastic spring element combin14, and the patch is simulated by shell element. Relative intensity, relative stiffness and yield load rising rate of a patched steel plate with regard to parameters, such as the patch length, width, the number of patch layer and ply orientation are studied. The results indicate that composite bonded repair can effectively restore the mechanical properties of the structure and improve the service life.

Study of Alternative Assembly Patterns Using Finite Element Analysis and Lab Tests

2018 ◽  
Author(s):  
Gong H. Jung ◽  
Wesley Pudwill ◽  
Elysia J. Sheu
Keyword(s):  
Finite Element ◽  
Elastic Interaction ◽  
Element Model ◽  
Potential Method ◽  
Test Results ◽  
Element Analysis ◽  
Fea Model ◽  
Assembly Method ◽  
Bolt Stress ◽  
Lab Test

A total of 24 lab tests were performed to evaluate two different joint assembly patterns (legacy and an alternative pattern), two lubricant types (Nickel based and Moly-Disulphide based), and two types of torque wrenches (Hydraulic and Pneumatic). Bolt stress was measured during assembly using load indicating bolts (SPC4). Assembly time was also measured since alternative assembly patterns have been recognized as a potential method for improving assembly efficiency without negatively impacting bolt pre-load scatter. In order to understand the bolt stress distribution in both of the legacy and alternative assembly patterns, a finite element model was developed to simulate wrench sequences specified by ASME PCC-1. The FEA model included the effect of elastic interaction of the bolts and flange. The FEA results indicate similar behavior when compared to the lab test results, and the FEA study was extended to two other alternative assembly patterns. This paper summarizes the results of the FEA and lab tests on a 24” NPS Class 300 flange and may provide validation and supporting information for users who are considering the use of a more efficient assembly method such as the alternative assembly patterns presented in ASME PCC-1.

Finite Element Analysis and Experimental Study on Failure Rolling Bearing

2016 ◽  
Vol 693 ◽  
pp. 332-339
Author(s):  
Zhe Wu ◽  
Jian Chao Zhang
Keyword(s):  
Finite Element ◽  
Vibration Signal ◽  
Element Model ◽  
Rolling Bearing ◽  
Center Frequency ◽  
Test Results ◽  
Rolling Bearings ◽  
Element Analysis ◽  
Band Pass ◽  
Mode Characteristic

As the most important component of moving parts in the wheel set system, the rolling bearings’ performance is the key to the safety of locomotive running. In this paper, the finite element model of rolling bearing with fault of inner ring stripping was established in ABAQUS, the first twenty orders of natural frequency and mode characteristic was analyzed. The highest frequency was used as the center frequency of the band pass filtering in the process of resonance demodulation and this technique was validated with simulation. Then fault vibration signal of rolling bearing was collected using wheel set running-in test bench and was analyzed with this method, the comparison proved that the simulation and test results basically tallied.

Nonlinear Finite Element Analysis of Adaptive-Slit Shear Walls

2013 ◽  
Vol 275-277 ◽  
pp. 1207-1211
Author(s):  
Ying Ying Yin ◽  
Ming Jin Chu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Studies ◽  
Shear Walls ◽  
Element Model ◽  
Finite Model ◽  
Test Results ◽  
Element Analysis ◽  
Practical Engineering ◽  
Monotonic Loads

In order to further study the mechanism of adaptive-slit shear walls under horizontal loads, and facilitate it better applied to practical engineering. On the basis of experimental studies, the ABAQUS finite element analysis software is used to establish the finite model of adaptive-slit shear. The finite element model accuracy is verified by comparing the model and test results. A validated model is used to study the mechanical property of adaptive-slit shear walls under monotonic loads.

A Numerical Investigation of the Performance of a Nacre-Like Composite under Blast Loading

2016 ◽  
Vol 846 ◽  
pp. 464-469 ◽  
Author(s):  
Abdallah Ghazlan ◽  
Tuan D. Ngo ◽  
Nelson Lam ◽  
Phuong Tran
Keyword(s):  
Finite Element ◽  
Blast Loading ◽  
Adhesive Layer ◽  
Organic Matrix ◽  
Adhesive Bond ◽  
Element Model ◽  
Element Analysis ◽  
Adhesive Bonds ◽  
The Finite Element Analysis ◽  
Brick And Mortar

This paper investigates the behaviour of a bio-inspired finite element composite model (that mimics the structure of nacre, the inner layer of molluscan shells) under blast loading. Nacre, which has attracted the attention of researchers over the past few decades, comprises 95% aragonite, brittle voronoi-like polygonal tablets that are joined by an organic matrix and arranged in a brick and mortar type structure. In this work, the finite element model developed herein was constructed using voronoi diagrams and geometric algorithms capable of automatically generating staggered layers of voronoi-like aluminium tablets bonded together by a vinylester adhesive layer. Many studies have led to the belief that the magnificent toughness of nacre is mainly attributed to the inter-platelet adhesive bonds. Results obtained from the finite element analysis show that this is indeed true, and it is imperative that the adhesive bond exhibits adequate toughness in order to be able to spread damage across the entire composite, thereby delaying localised failure.

Finite Element Analysis of Friction Coefficient on Recycled Concrete Wall-Beam Interface

2014 ◽  
Vol 578-579 ◽  
pp. 699-702
Author(s):  
Min Zhang ◽  
Chuan Long Zou ◽  
Xiao Jian Fu
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Ultimate Load ◽  
Element Model ◽  
Recycled Concrete ◽  
Brick Wall ◽  
Maximum Deflection ◽  
Test Results ◽  
Concrete Wall ◽  
Element Analysis

Mechanical testing on the first group of ordinary brick wall-beam and second group of recycled brickbat concrete wall-beam, measured its ultimate load and the maximum deflection, establishing finite element model to analyze, and comparing with the test results. It will be show that under the action of ultimate load, friction coefficient between the upper-wall of the wall-beam and joist can be desirable between 0.35 ~ 0.45, and the friction coefficient of recycled concrete wall-beam is bigger than ordinary wall-beam, and the higher the intensity of the upper-wall is, the bigger its friction coefficient is, as well as the greater stiffness of the wall-beam is.

Finite Element Analysis of Head-Form Impacting Laminated Glass for Automotive Windscreens

2016 ◽  
Vol 680 ◽  
pp. 72-75
Author(s):  
Yan Min ◽  
Zeng Chen Cao ◽  
Shuang Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Mechanical Behavior ◽  
Element Model ◽  
Laminated Glass ◽  
Element Analysis ◽  
Head Form ◽  
Set Up ◽  
The Finite Element Model

Based on GB/T 5137.1-2002 experiment specification, the finite element model of head-form impacting laminated glass for automotive windscreens is set up in this paper. According to Finite Element Analysis results of laminated glass with different structure and further analyzing impact property and mechanism of laminated glass , the influence rule of the structure of the laminated glass on the mechanical behavior is discussed. (H)

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