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 43 for “"Debond"”.
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Debond Buckling of Woven E-glass/Balsa Sandwich Composites Exposed to One-sided Heating
… structures exposed to one-sided heating where a debond exists between the unexposed facesheet and core material. Sandwich composites of plain weave E-glass/epoxy facesheets and an end-grain balsa wood core manufactured using the Vacuum Assisted Resin Transfer Molding (VARTM) technique were the …
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Effect of refrigerant spray on orthodontic composite resin-bracket debond strength and associated adhesive remnant index
… speed on orthodontic composite resin shear debond strength and Adhesive Remnant Index (ARI) after bond failure. Orthodontic brackets were bonded to forty paired extracted mandibular third molars. Pairs were divided into experimental and control groups, with and without refrigerant spray …
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A randomised controlled trial to assess the pain associated with the debond of orthodontic fixed appliances
… fixed appliances, expectations of pain during debond and whether biting on a soft acrylic wafer during debond decreases the pain experienced. Method: Ethical approval was gained. Subjects were randomly allocated to the control or wafer group. A visual analogue scale (VAS) based questionnaire …
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The Application of Debond Length Measurements to Examine the Accuracy of Composite Interface Properties Derived From Fiber Pushout Testing
… 400$\sp\circ$C, indicating that the fibers were debonded by the fatigue load. The identification of progressive debonding in metal matrix composites is also discussed.
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Finite Element Analysis of Probe Induced Delamination of a Thin Film at an Edge Interface
… crack closure method. Having assumed a circular debond as observed experimentally, energy release rates are determined by a step-wise approach around the circumference. The progression of debond is simulated in multiple analyses by altering the boundary conditions associated with increasing the …
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Quantitative evaluation of thin film adhesion using the probe test
… to lift-up from the surface of the substrate. A debond is thus initiated at the loading point and propagates as a semi-circular crack at the interface as the probe slides under the coating. A standard test procedure has been developed for testing thin adhesive coating/substrate systems. The …
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An interdisciplinary study of cathodic debonding in elastomer/metal adhesive bonds
… activated complex at the degraded crack tip. Debond, or loss of adhesion, can exist in two modes. Weakening denotes debond growth which takes place undetected to the naked eye, and is governed by a diffusion-control degradation process that gives a straight line when plotted against the square …
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Analysis of matrix damage in single fiber composites
… strains or the fiber/matrix interface w ill debond depending on the interfacial strength. This damage of the fiber or the matrix would eventually lead to the ultimate failure of the composite. Hence it is essential to analyze the stresses and energies associated with an unidirectional …
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The notched coating adhesion specimen: a fracture test for coatings and accelerated screening test for adhesion
… method is proposed to provide estimates of the debond toughness of adhesive bonds. Notched coating adhesion (NCA) specimens consist of single substrates coated with thin layers of adhesive. The coating is notched to induce initial debonds, and the specimen is then loaded in a manner to produce …
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Crack Path Selection in Adhesively Bonded Joints
… the fracture sequence, the influences of the debond rate on the locus of failure and the directional stability of cracks are investigated. Post-failure analyses suggest that the failure tends to be more interfacial when the debond rate is low and tends to be more cohesive when the debond rate …
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Push out strengths of a double tapered post system with 3 different cements
… three resin cements would produce the highest debond stress values with a double-tapered fibre post system. In the past, conventional parallel- sided prefabricated or cast metal posts have been used, which has considerable mechanical strength but lacks aesthetic capabilities. Post preparation …
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Investigation of Oxide Fiber/oxide Matrix Composites With a Weak Interphase
… of friction, clamping pressure, interface debond strength, and interface friction strength. A systematic study of the effect of interphase coating thickness on interface properties and pushout response was performed on two Al$\rm\sb2O\sb3$-matrix fiber model composites. The different …
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Effects of Surface Microstructure on the Strength of Adhesively Bonded Structures
… for this experiment. The LDCB specimen was debonded by peeling off the epoxy layer from the aluminum substrate using a steel wedge. Interfacial fracture energy was extracted from the debond length by developing a closed-form solution for the specimen geometry based on a ""beam on an elastic …
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Interfacial Mechanics in Fiber-Reinforced Composites: Mechanics of Single and Multiple Cracks in CMCs
… second issue is the stress distribution near the debond/sliding interface. If the interface is weak enough for the main matrix crack to deflect and form a debond/sliding zone, then the stress distribution around the sliding interface is of interest because it provides insight into further cracking …
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A study of blister tests for film adhesion measurement and fracture efficiency of tests for adhesive bonds
… localized high stress concentrations near the debond front and therefore, yielding or rupturing may still unavoidable in such specimens. The significant localized inelastic effect on the measurement of the bond fracture strength is also demonstrated in the peninsula blister experiment for an …
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Mechanisms and mechanics of non-structural adhesion
… into the mechanisms of adhesion and debonding energy associated with the cling between polymeric films and various substrates is presented first. The thermodynamic work of adhesion, electrostatic attraction, and substrate roughness apparently play significant roles in the cling of a …
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The development of the peninsula blister fracture test for adhesively bonded joints
… release rate over the major portion of the debond length and a high strain energy release rate at any given pressure. Applications of this technique to several adhesion systems were conducted. Although some of these systems haven't been successfully tested due to various reasons, …
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Assessment of Orthodontic Treatment Results: Two-Phase Treatment (Early Intervention) vs. One-Phase Treatment (Late Intervention)
… that made the treatment quality poor. Early debond tended to occur more often with boys than girls. Generally Angle's Class I cases and the cases finished in year 1998 had better treatment results. Although the early treatment group had longer treatment time than late treatment group, the …
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Structural analysis and assessment of Guastavino vaulting
… that sets them apart: soffit tiles can debond and fall as a result of cracking or water damage. Falling tiles pose a serious mortal danger but do not necessarily threaten a structure's safety. Nonetheless, they elicit dramatic structural repairs and retrofits. The case studies present an …
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Polymer impregnation and its effect on the rupture properties of leather
… When stress is applied to such leather, fibres debond from the network and disentangle from the fibre structure. Work must be done to overcome surface friction between fibre and polymer. However, there is a balance between (a) interfacial bond strength and friction, and (b) fibre strength. This …
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