Abstract This work focuses on Mode I fatigue induced delamination growth onset characterization of co-cured (CC), co-bonded (CB) and secondary bonded (SB) composite joints with an epoxy interleaf. The CC joints used in this work comprise only fibers and resin, while, CB and SB joints contain an adhesive film. Experimental tests were carried out at room temperature using double cantilever beam (DCB) specimens. The delamination behavior was evaluated in terms of the strain energy release rate (SERR) considering a no-growth criterion based on 10 6 cycles without crack propagation. For Mode I cyclic loading, the threshold values of the CB and SB joints were about 2.5 times higher than the one achieved by the CC joints, presenting a better performance in terms of fatigue delamination growth-onset. A fractographic study was conducted using scanning electron microscopy in order to relate the SERR results with the joint ′ s failure mechanisms. It was observed that there is a good mechanical compatibility between the substrate and adhesive in the CB and SB joints studied herein. The results found in this paper indicated that the Mode I SERR threshold values were not significantly affected by the interleaf.
Part 1 Review Topics Historical Development of Adhesives and Adhesive Bonding Fundamental Aspects Theories and Mechanisms of Adhesion Application of Plasma Technology for Improved Adhesion of Materials Silane and Other Adhesion Promoters in Adhesive Technology Testing of Adhesives Physical Testing of Pressure-Sensitive Adhesive Systems Durability of Adhesive Joints Analysis of Adhesives Fracture of Adhesive-Bonded Wood Joints Spectroscopic Techniques in Adhesive Bonding Ultraviolet Stabilization...
Preface INTRODUCTION History and Overview Why Structures Fail Historical Perspective The Fracture Mechanics Approach to Design Effect of Material Properties on Fracture A Brief Review of Dimensional Analysis References FUNDAMENTAL CONCEPTS Linear Elastic Fracture Mechanics An Atomic View of Fracture Stress Concentration Effect of Flaws The Griffith Energy Balance The Energy Release Rate Instability and the R Curve Stress Analysis of Cracks Relationship Between K and G Plane Stress versus Plane S...
#1S. Budhe(CEFET-MG: Centro Federal de Educação Tecnológica de Minas Gerais)H-Index: 12
#2Mariana D. Banea(CEFET-MG: Centro Federal de Educação Tecnológica de Minas Gerais)H-Index: 33
Last. L.F.M. da Silva(Faculdade de Engenharia da Universidade do Porto)H-Index: 24
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Abstract Continuing interest and more developments in recent years indicated that it would be useful to update Banea and da Silva paper entitled “Adhesively bonded joints in composite materials: an overview”. This paper presents an updated review of adhesively bonded joints in composite materials, which covers articles published from 2009 to 2016. The main parameters that affect the performance of bonded joints such as surface treatment, joint configuration, geometric and material parameters, fa...
Abstract Experimental and numerical studies of the fatigue/fracture behavior of carbon–epoxy composite bonded joints under pure mode I, pure mode II and mixed-mode I + II loading were performed. The Double Cantilever Beam, End-Notched Flexure and Single-Leg Bending tests were used for fatigue/fracture characterization under high-cycle fatigue loading. Equivalent crack length based procedures were used to evaluate the evolution of strain energy release rates during the tests, avoiding the difficu...
A fatigue crack propagation test under mode II has been set up for unidirectional composite laminate characterization at high frequency. The specimen is clamped on a shaker and loaded on its first bending resonance mode. This dynamical test allows an accurate delamination extension monitoring based on the resonance frequency shift. Dynamical tests are conducted at 260 Hz and 400 Hz and their results are compared to those obtained with 10 Hz 3-ENF tests. Fatigue crack propagation results are pres...
Last. C. Little(NREL: National Renewable Energy Laboratory)H-Index: 1
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In this paper, fatigue life estimation for delamination growth of laminated fibre reinforced polymer (FRP) composite structures in mode I and mode II based on fracture mechanics is presented. The proposed method was applied to delamination of glass/epoxy laminated composite. Both the threshold energy release rate (Gth) and the delamination propagation based on Paris’ law were studied. The double cantilever beam (DCB) specimen for mode I and 3 points End-Notched Flexure (3ENF) specimen for mode I...
Abstract This paper, analyses the mode I fracture behaviour under fatigue loading of two aircraft quality composites at different test temperatures. The materials under study are made of the same unidirectional carbon fibre but employ a different epoxy resin matrix. Both composites had the same symmetric configuration [0°]16/s. In the analysis, double cantilever beam specimens were tested at different temperatures: 20 °C (room temperature), 0 °C, −30 °C and −60 °C (different estimated in-flight ...
#1Joseph Mohan(UCD: University College Dublin)H-Index: 5
#2Alojz Ivankovic(UCD: University College Dublin)H-Index: 23
Last. Neal Murphy(UCD: University College Dublin)H-Index: 18
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Abstract The mode I fracture toughness of a single co-cured and two secondary bonded joint systems were determined using the double cantilever beam test. The initiation values of fracture toughness from the PTFE film insert and a mode I crack-tip were considered as well as propagation values. It was found that the starting defect had a large influence on the initiation values for fracture toughness. It was also found that the two secondary bonded systems predominantly resulted in cohesive failur...
Abstract This paper reviews existing literature related to the peel ply surface treatment of composite materials. A peel ply fabric is used as a removable layer in a composite lay-up and ripped off to modify the surface for adhesive bonding. A peel ply can affect the elemental composition of a surface and it is possible to distinguish between either a polyester or a polyamide peel ply treatment for a specific composite system and application. However, consistent and generalised relationships bet...
Last. R.D.F. Moreira(Faculdade de Engenharia da Universidade do Porto)H-Index: 9
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Fatigue/fracture characterization of carbon-epoxy laminates under pure mode I loading is addressed in this work. Double cantilever beam fatigue/fracture tests were performed to obtain the fatigue l...
Last. Monica Ferraris(Polytechnic University of Turin)H-Index: 42
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Abstract Nowadays glass is widely used in building applications and coupled to steel through adhesive joining. Reliable mechanical characterization of these joints is necessary to design and predict the final structure performance. In this framework, the aim of this paper is to measure the pure shear strength and elastic modulus for design and modelling of adhesive joined glass-to-steel structures. Torsional shear strength and elastic properties of an adhesively bonded glass-to-steel component w...
Adhesive joints between dissimilar layers of metals and composites are increasingly used by different industries, as they promise significant weight savings and, consequently, a reduction in energy consumption and pollutant emissions. In the present work, the interfacial fracture behavior of a new titanium–carbon fiber reinforced plastic (CFRP) adhesive joint is experimentally investigated using the double cantilever beam (DCB) and end-notched flexure (ENF) test configurations. A potential appli...
Abstract The purpose of this work is to develop a computational method for adhesively bonded composite structures lifetime assessment. A cohesive zone model – based formulation including fatigue damage is selected. The model is implemented in the finite element software Abaqus through user subroutine. Numerical simulations are subsequently performed for the mode I crack propagation case. Validation of available experimental data for both quasi-static and high-cycle fatigue tests is successfully ...