Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"adhesively bonded joints"”.
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Crack Path Selection in Adhesively Bonded Joints
… understanding of the crack path selection in adhesively bonded joints. Using Dow Chemical epoxy resin DER 331® with various levels of rubber concentration as an adhesive, and aluminum 6061-T6 alloy with different surface pretreatments as the adherends, both symmetric and asymmetric double …
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Viscoelastic stress analysis of adhesively bonded joints
Existing closed form solutions for the stress analysis of the single lap joint were studied intensively, and methods of analysis and assumptions between the analyses of Goland and Reissner, Hart-Smith and Delale and Erdogan were compared. The existing SAAS3V finite element program was modified to …
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Characterization of adhesively bonded joints using bulk adhesive properties
Though using bulk adhesive properties to predict adhesively bonded joint response has yet to be proven infallible, based upon the success of previous works, this effort attempts to shed some light on the stresses present in a typical automotive bonded joint. Adhesive material properties obtained in …
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Structural Health Monitoring of Adhesively Bonded Joints With Piezoelectric Wafer Active Sensors
… new approach to structural health monitoring of adhesively bonded joints using small, unobtrusive piezoelectric wafer active sensors (PWAS) which are permanently affixed on the surface of the structure. PWAS can be placed in restrictive spaces, like in built-up aerospace structures. The …
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Structural and residual strength analysis of metal-to-metal adhesively bonded joints.
… were used to detect the defects in adhesive joints manufactured with two different adhesive types (brittle, ductile) and different defect area distributions (0%, 25% and 40%) along one of the interfaces. The chosen type of defect was kissing bonds, as these are the most difficult to detect. …
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The development of the peninsula blister fracture test for adhesively bonded joints
… quantitatively measure the adhesion of various adhesively bonded joints. Analytical results reveal that this peninsula-like geometry benefits from both a constant strain energy release rate over the major portion of the debond length and a high strain energy release rate at any given pressure. …
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Defect detection and condition assessment of adhesively-bonded joints using acoustic emission techniques.
… to the defect detection and monitoring of adhesively-bonded joints. Pencil Lead Breaks (PLBs) have been used as a simulated AE source to experimentally investigate the characteristics of AE wave-propagation in adhesively-bonded joints, and have been combined with Artificial Neural Networks …
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Special finite elements for modelling adhesively bonded joints in two- and three-dimensions
Special methods were developed to model adhesively bonded joints in two- and three- dimensions using a simple finite element approach. Analysis of a two-dimensional bonded joint is performed by using plane frame elements to model the adherends, and a single plane elasticity-type element through the …
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The effect of residual thermal stresses on the viscoelastic behavior of adhesively bonded joints
Present stress analysis of adhesively bonded joints suffers from inadequate adhesive material characterization. The lack of correlation between bulk adhesive properties and the corresponding in-situ behavior has led to numerous adhesive test geometries. The current study was an attempt to predict …
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Predicting mechanical performance of adhesively bonded joints based on acousto-ultrasonic evaluation and geometric weighting
Prediction of the performance of adhesively bonded joints is essential to the acceptance of this mode of fastening. In ideal situations where the bonding is uniform throughout the joint the stress distribution depends on the material properties and the joint geometry. Knowledge of the bond …
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Three dimensional geometrical and material nonlinear finite element analysis of adhesively bonded joints for marine structures
… are explored in the context of application of bonded joint configurations in marine environment.<br/><br/>The research is directed at developing analysis tools for predicting the displacement, stress and strain fields in adhesively bonded joints between dissimilar adherends. In the finite …
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Special 2-D and 3-D Geometrically Nonlinear Finite Elements for Analysis of Adhesively Bonded Joints
… and cost-effective finite element model for adhesively bonded joints which could be used in industry. Stress and durability analyses of crack patch geometries are possible applications of this finite element model. For example, the lifetime of aging aircraft can be economically extended by …
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An elastic-plastic interface constitutive model for combined normal and shear loading : application to adhesively bonded joints
… model is then explored for the geometry of bonded curvilinear blocks at different loading angles and for a notched four point bend geometry. In addition, a rate dependent elastic-plastic interface constitutive model for combined normal and shear loading is presented, and an initial …
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Crack path selection and shear toughening effects due to mixed mode loading and varied surface properties in beam-like adhesively bonded joints
… failure and the subsequent service lives of the bonded structures. The behavior of propagating cracks in adhesive joints remains of interest, including when some critical environments, complicated loading modes, or uncertainties in material/interfacial properties are involved. From a mechanics …
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Nonlinear analysis of bonded joints with thermal effects
A numerical analysis of the nonlinear response of bonded joints is presented. Mechanical and thermal loadings are considered. Material stress-strain response is represented by Ramberg-Osgood approximations. Temperature-dependent properties including modulus percent retentions and coefficients of …
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A feasibility study of PVDF piezoelectric sensors to detect damage in adhesive joints
… thin and light-weight, they can be attached to adhesively bonded joints permanently to measure bond integrity. The present study shows the different steps to design such sensors and proper techniques to attach them near the adhesive bondline. PVDF sensors have been successfully used as NDT …
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Backface strain as an index to detect damage initiation and propagation in composite adhesively bonded joints (From manufacturing and mechanical characterization of specimens to simulation, estimation of adhesive fracture properties, and Structural health monitoring (SHM) of joints)
L'abstract è presente nell'allegato / the abstract is in the attachment
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A finite element analysis of adhesively bonded composite joints including geometric nonlinearity, nonlinear viscoelasticity, moisture diffusion and delayed failure
… accurate analysis of the strains and stresses in adhesively bonded joints. The large displacements and rotations experienced by the adherends and the adhesive are taken into account by invoking the updated Lagrangian description of motion. The adhesive layer is modeled using Schapery's nonlinear …
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Multi-material Adhesive Bonded Joints Under Static And Dynamic Loading
<p>Adhesively bonded joints present significant potential for reducing structural weight and enhancing performance in modern and future engineering structures. By enabling the elimination or reduction of traditional mechanical fasteners and facilitating the integration of dissimilar materials, …
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