Home
/
Mechanical engineering
/
Determination of the state of stress between adhesively bonded single lap-joints.
Determination of the state of stress between adhesively bonded single lap-joints.
Table Of Contents
- Approval Page iCertification iiDedication iiiAcknowledgement. ivAbstract v Table of Content viSymbols viiiList of Figures xList of Tables xii
Chapter ONE
INTRODUCTION
- INTRODUCTION
- 11.1Aims and Objectives
- 11.2Scope of the Project Research
- 21.3Significance of Study 2CHAPTER TWO LITERATURE REVIEW
- 32.1Volkersen’s Theory
- 32.2Theory of Goland and Reissner
- 42.3Plantema’s Modification
- 52.4Modification of Kelsey and Benson 52.
- 5.Review of Different Types of Joints
- 72.6Adhesive Properties
- 82.7Failure Modes of Laminate Composites
- 92.8Environmental Factors Affecting Laminate Composites 102.
- 9.Advantages and Disadvantages of Bonded Joints
- 112.10Summary 11CHAPTER THREEMETHODOLOGY 123.1Tension Test
- 123.2Shear Test
- 133.3Bending Test
- 143.4Analysis
- 163.5Detail Design Considerations 23CHAPTER FOUR EXPERIMENTAL RESULTS AND DATA ANALYSIS
- 244.1Joint Calculations for Single Lap-Joint 1
- 274.2Joint Calculations for Single Lap –Joint 2
- 294.3Joint Calculations for Single Lap –Joint 3
- 314.4Joint Calculations for Single Lap –Joint 4
- 334.5Experiment Results
- 354.51Tension Test Result 354.
- 6.Shear Test Result 424.
- 7.Bending Test Result 474.
- 8.Comparison of Results of Experimental Testing and Analysis 61CHAPTER FIVE DISCUSSIONS AND CONCLUSION 67RECOMMENDATIONSREFERENCES TABLE OF CONTENTSApproval Page iCertification iiDedication iiiAcknowledgement. ivAbstract v Table of Content viSymbols viiiList of Figures xList of Tables xii
Chapter ONE
INTRODUCTION
- INTRODUCTION
- 11.1Aims and Objectives
- 11.2Scope of the Project Research
- 21.3Significance of Study 2CHAPTER TWO LITERATURE REVIEW
- 32.1Volkersen’s Theory
- 32.2Theory of Goland and Reissner
- 42.3Plantema’s Modification
- 52.4Modification of Kelsey and Benson 52.
- 5.Review of Different Types of Joints
- 72.6Adhesive Properties
- 82.7Failure Modes of Laminate Composites
- 92.8Environmental Factors Affecting Laminate Composites 102.
- 9.Advantages and Disadvantages of Bonded Joints
- 112.10Summary 11CHAPTER THREEMETHODOLOGY 123.1Tension Test
- 123.2Shear Test
- 133.3Bending Test
- 143.4Analysis
- 163.5Detail Design Considerations 23CHAPTER FOUR EXPERIMENTAL RESULTS AND DATA ANALYSIS
- 244.1Joint Calculations for Single Lap-Joint 1
- 274.2Joint Calculations for Single Lap –Joint 2
- 294.3Joint Calculations for Single Lap –Joint 3
- 314.4Joint Calculations for Single Lap –Joint 4
- 334.5Experiment Results
- 354.51Tension Test Result 354.
- 6.Shear Test Result 424.
- 7.Bending Test Result 474.
- 8.Comparison of Results of Experimental Testing and Analysis 61CHAPTER FIVE DISCUSSIONS AND CONCLUSION 67RECOMMENDATIONSREFERENCES TABLE OF CONTENTSApproval Page iCertification iiDedication iiiAcknowledgement. ivAbstract v Table of Content viSymbols viiiList of Figures xList of Tables xii
Chapter ONE
INTRODUCTION
- INTRODUCTION
- 11.1Aims and Objectives
- 11.2Scope of the Project Research
- 21.3Significance of Study 2CHAPTER TWO LITERATURE REVIEW
- 32.1Volkersen’s Theory
- 32.2Theory of Goland and Reissner
- 42.3Plantema’s Modification
- 52.4Modification of Kelsey and Benson 52.
- 5.Review of Different Types of Joints &am
Thesis Abstract
In this work, the state of stress between adhesively bonded single lap-joints was determined. The state of stress between adhesively bonded single lap-joints was determined by using a linear elastic analysis and experimental testing. In the analysis part of this work, the shear and normal stresses in an adhesively bonded single lap –joints were predicted by subjecting the joint to tension; shear force, and bending moments. Differential equations were used to model the problem and the joint was analyzed using a linear elastic analysis. The solution of the differential equations was used in predicting the shear and normal (peel) stress distributions over the single lap-joint. The boundary conditions used limit the analysis to two adherends having the same thicknesses, lengths, and material properties. In the experimental testing, twelve single lap-joints were produced. These joints were produced using four different overlap lengths(12.7mm,14mm,16mm,and 18mm),and then grouped into three with each group having four single lap-joint of 12.7mm,14mm,16mm,and 18mm overlap lengths. Each of the three groups were subjected to tension, shear force and bending moments by using a universal testing machine and dead weights. The shear and normal stress distributions over the joints were obtained by dividing the applied loads with the area of the overlap region of the joint. It became evident from this work that increasing the overlap length results in an increase in joint strength, and a decrease in both the shear and normal stresses due to an increase in the area of bond. It was also found from this work that maximum stresses occurs the ends of the overlap region of the joint and are hence the critical regions of the bonded assembly. It was also found from this work that the failure associated with single lap-joint are mainly as a result of the failure in the adhesive layer known as adhesive failure. The shear and normal stresses obtained from these tests were in agreement with those obtained from analysis in this work. These tests were used to check the analytical results and to establish confidence in theory. This work could be applied in the determination of the state of stress between adhesively bonded laminated composite door panels.
Thesis Overview
<p> </p><p><strong> INTRODUCTION</strong></p><p>Adhesive bonding is a material joining process in which an adhesive, placed between the adherend surfaces, solidifies to produce an adhesive bond.</p><p>Adhesively bonded joints are increasing alternatives to mechanical joints in engineering applications and provide many advantages over conventional mechanical fasteners. Among these advantages are lower structural weight, lower fabrication cost, and improved damage tolerance. The application of these joints in structural components made of fibre-reinforced composites has increased significantly in recent years. The traditional fasteners usually result in cutting of fibres, and hence the introduction of stress concentration, both of which reduce structural integrity.</p><p>Bonded joints are more continuous and have potential advantages of strength-to-weight ratio, design flexibility, and ease of fabrication. To design structural joints in engineering structures, it is necessary to be able to analyze them. This means to determine stresses and strain under a given loading, and to predict probable points of failure. There are two basic mathematical approaches for the analyses of adhesively bonded joints: closed-form analysis (Analytical methods) and numerical methods (ie forward difference method and finite-element analyses).The literature dealing with joining composite structures with adhesives concentrates on investigating the bond strength.</p><p>There are several factors affecting the qualities of a bonded assemble like the effect of surface preparation and effect of joints configuration. The surface plays an important role in the bonding process and is perhaps, the most important process governing the quality of an adhesively bonded joint. Surface treatment prior to the application of adhesives is recommended to achieve maximum mechanical strength. Typical composite surface treatments include solvent cleaning techniques for thermo sets composites, where as thermoplastics composites require surface topographical changes to ensure strong and durable bond strength. For the effect of joints configuration, since joints represent one of the greatest challenges in the design of structures in general and in composite structures in particular since they entail discontinuities in the geometry of the structure. Unlike surface preparation, joint configuration is usually a product of design. The strength of a given type of joint depends, for a given type of load, on the stress distribution within the joint, which in turn depends on the joint geometry and the mechanical properties of the adhesive and adherend. Joints made with high strength adhesives more likely to fail prematurely in composite before failure in the adhesives occurs.</p><p><strong> 1.1 Aims and Objectives</strong></p><ul><li>To determine the local stresses in the adherends (materials being bonded, or substrates) and adhesive, so that predictions can be made of critical locations in the bonded assembly.</li><li>To determine the failure mechanism in single lap- joint (that is interfacial and cohesive failure as a result of normal or shear stresses exceeding the bond strength).</li><li>To determine the effects of increasing overlap length on the shear and normal stress distributions.</li></ul><p><strong> </strong></p><p><strong>1.2 Scope of the Work</strong></p><p>This work will involve both experimental testing and analysis. Twelve single lap-joints will be produced. Twelve of the joints will be divided into three groups (four per group with the different overlap lengths). The first group with four single lap-joint with different overlap lengths will be subjected to tensile loading, while the second and third groups will be subjected to shear force and bending moments using a universal testing machine and dead weights. The shear and normal stresses will be obtained by dividing the applied loads with the area of the overlap region of the joint.</p><p>In the analysis part of this work, the joints will be analysed by subjecting them to tension, shear force and bending moments. Differential equations will be used to model the problem and the joint will be analysed by using a linear elastic analysis. The solution of the differential equations will be used in determining the shear and normal stresses over the joint.</p><p> </p><p><strong>1.3 Significance of Study</strong></p><ul><li>This work will help in determining the stresses involved in opening and closing of door panels made of fibre reinforced composites.</li><li>This work will help to identify the relationship between the increase in stresses at the interface of a bonded joint and the joint strength.</li><li>This work will identify if it is the increase porosity (air voids) in the bond line that causes the joint to fail, or the increase in stresses observed along the interface of the bond line.</li></ul> <br><p></p>Blazingprojects Mobile App
📚 Over 50,000 Research Thesis
📱 100% Offline: No internet needed
📝 Over 98 Departments
🔍 Thesis-to-Journal Publication
🎓 Undergraduate/Postgraduate Thesis
📥 Instant Whatsapp/Email Delivery
Related Research
Medical Laboratory S.
3 min read
A Framework for Standardizing Quality Control Practices in Clinical Laboratory Testi...
This research focuses on developing a clear and practical framework to standardize quality control practices in clinical laboratory testing. Quality control in ...
BP
Blazingprojects
Mechanical engineeri.
4 min read
A Framework for Parametric Modeling of Additive Manufacturing Mechanical Properties...
This research focuses on developing a systematic framework to model the mechanical properties of materials produced through additive manufacturing (AM), also kn...
BP
Blazingprojects
Mathematics.
3 min read
A Framework for Modeling Nonlinear Dynamics in Chaotic Systems...
This research aims to develop a comprehensive framework for understanding and modeling nonlinear dynamics in chaotic systems. Chaotic systems are complex system...
BP
Blazingprojects
Materials and Metall.
3 min read
A Framework for Predicting Corrosion Resistance in Aluminum Alloy Composites...
This research focuses on developing a structured way to predict how well aluminum alloy composites resist corrosion, which is a common challenge in many industr...
BP
Blazingprojects
Mass communication.
2 min read
A Framework for Analyzing the Impact of Social Media Influencers on Youth Political ...
This research examines how social media influencers affect the way young people engage with politics. In recent years, social media influencers—individuals wi...
BP
Blazingprojects
Marketing.
4 min read
A Framework for Integrating Social Media Engagement into Customer Loyalty Models...
This research explores how social media engagement influences customer loyalty, aiming to create a new framework that combines these two areas. Customer loyalty...
BP
Blazingprojects
Linguistics.
4 min read
A Framework for Analyzing Code-Switching as a Pragmatic Competence...
This research is focused on understanding how people switch between languages or dialects in everyday conversation, a phenomenon known as code-switching. Specif...
BP
Blazingprojects
Library Science Educ.
2 min read
A Framework for Enhancing Critical Teaching Skills in Library Science Education...
This research focuses on developing a clear and practical framework that can help improve the way library science educators teach critical thinking skills. Crit...
BP
Blazingprojects
Library and informat.
3 min read
A Framework for Assessing Information Literacy Development in Academic Libraries...
This research is about creating a clear and practical framework that can be used to assess how well students in universities develop their information literacy ...
BP
Blazingprojects
