Global ETD Search
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Showing 1 to 20 of 27 for “"Adhesive joint"”.
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Video and laser microscopy investigation of adhesive joint fracture in fiber reinforced composite materials
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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Modeling of active crack damage control and the active fatigue damage control of adhesive joint
… with active fatigue damage control of adhesive joints. The damage and active control mechanisms of the adhesive joints have been experimentally and theoretically investigated.
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FAILURE MECHANISMS OF STRUCTURAL ADHESIVE JOINTS
… of different levels of moisture on epoxide adhesive (BGEBA/DAB) joints has been investigated. On exposure up to 10 080 hours, using sandblasting treatment on aluminium prior to bonding, the joint strength had decreased far more rapidly at higher activities above 0.7 than at lower activities. …
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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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Failure Prediction of Adhesively Bonded Hardboard Doorskin Joints
… combinations of hardboard thickness and adhesive joint stiffness. It predicts that as the stile width decreases, the point of maximum deflection, and greatest stresses, moves toward the outside edge of the panel. The ability to predict the critical stile width, or the stile width below …
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Durability of Adhesive Joints Subjected to Environemntal Stress
… can degrade the mechanical properties of the adhesive, as well as the integrity of an adhesive interface with a substrate. Therefore such disruptions can significantly reduce the lifetime and durability of an adhesive joint.1-4 In this research, the durability of certain epoxy adhesive joints …
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A feasibility study of the acousto-ultrasonic technique to assure the quality of adhesively bonded sheet metal
… technique for assuring the quality of adhesively bonded sheet-metal used for automobiles. Other nondestructive (NDT) techniques were also applied viz., ultrasonics. radiography and thermography to supplement and verify the results of the AU technique. The AU Technique demonstrated the …
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The development of poly(vinylidene fluoride) piezoelectric sensors for measuring peel stresses in adhesive joints
… responsible for the failure of most laboratory adhesive joint geometries, the measurement of these stresses has been accomplished only through the use of very sophisticated optical techniques. In order to develop a more versatile measurement technique, poly(vinylidene fluoride) film was used to …
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Piezo-induced fatigue of solder joints
Piezomechanical loading of an adhesive joint is a very close analogue to the loading imposed by adherends with dissimilar thermal expansion coefficients under a temperature change. Using this concept, a double lap joint test specimen was developed to investigate the damage mechanisms in solder …
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Characterization of a Pressure Sensitive Adhesive (PSA) for Mechanical Design
… and presenting the material data for use in adhesive joint designs. There are a number of models/theories that can be applied to the design of Pressure Sensitive Adhesive (PSA) joints. Unfortunately, few design engineers are familiar with these models and the models are not formatted in a …
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Implementation of Composites and Plastics Materials for Vehicle Lightweight
… composites, thermoplastic and smart hot melts adhesives materials in selected automotive applications to achieve lightweight vehicle. Special attention was paid to specific parts of vehicle structures that are directly related to occupant and pedestrian safety concerns such as B-pillar, frontal …
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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
Structural adhesives are widely used with great success, and yet occasional failures can occur, often resulting from improper bonding procedures or joint design, overload or other detrimental service situations, or in response to a variety of environmental challenges. In these situations, cracks …
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Structural modelling of adhesive joints in automotive bodies
… a vehicle is dependent on the stiffness of the joints between the sheet components in the body shell. Although spot-welding is the predominant joining method for the construction of steel bodies in the automotive industry, other alternatives are now being considered. Adhesive bonding offers the …
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Evaluating Thermal and Mechanical Properties of Electrically Conductive Adhesives for Electronic Applications
… long-term durability of electrically conductive adhesives for electronic interconnection applications. Three model conductive adhesives, designated as ECA1, ECA2 and ECA3, supplied by Emerson & Cuming, were investigated, in conjunction with printed circuit board (PCB) substrates with …
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Effects of imperfections on the response of composite structures with scarf joints
… structures. One such repair method is the scarf joint, an adhesive joint that allows for the original surface profile of a structure to be maintained. Studies of scarf joints have primarily considered an idealized version of the configuration, whereas there will be imperfections that arise during …
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Global-local Finite Element Fracture Analysis of Curvilinearly Stiffened Panels and Adhesive Joints
… the so-called unitized structures, and that of adhesive joints. A damage tolerance study of the unitized structures requires cracks to be defined in the vicinity of the critical stress zone. With the damage tolerance study of unitized structures as the focus, responses of curvilinearly stiffened …
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BOND STRENGTH EVALUATION IN ADHESIVE JOINTS USING NDE AND DIC METHODS
Adhesive bonding of graphite epoxy composite laminates to itself or traditional metal alloys in modern aerospace and aircraft structural applications offers an excellent opportunity to use the most efficient and intelligent combination of materials available thus providing an attractive package for …
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An Investigation of Plasma Pretreatments and Plasma Polymerized Thin Films for Titanium/Polyimide Adhesion
… strength of the titanium alloy/FM-5 polyimide adhesive joint for aerospace applications, oxygen plasma pretreatments and novel thin plasma polymerized (PP) films were investigated as adhesion promoters. Plasma treatments were carried out using custom-built, low pressure, radio frequency, …
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Durable Sandwich Structure Joining Technology for NASA's Ares V Launch Vehicle
… launch vehicles, should be mass-efficient. Adhesively bonded joints can provide increased mass-efficiency over mechanically-fastened joints. But, due to manufacturing sensitivities and certification requirements, conventional bonded joints can be improved upon by introducing structural …
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