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 18 of 18 for “"structural adhesive"”.
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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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Factors affecting the fracture energy of a structural adhesive
… investigation was conducted on a modified epoxy adhesive (Metlbond 1113-2). Initially various adhesive fracture strength and energy tests and the mechanisms of mechanical and chemical adhesion were discussed. A critical study was then made of the sensitivity of the strain energy release rate·to …
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Comparing In Situ and Bulk Constitutive Properties of a Structural Adhesive
… the continuing quest for more efficient designs, structural adhesives are being used in place of, or with, traditional fastening methods; however designing with adhesives is refined as traditional methods. To obtain the adhesive design properties, tests are often performed on bulk tensile and …
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Performance Evaluation and Durability Studies of Adhesive Bonds
… the adhesion performance and durability of adhesive bonds for specific applications in areas spanning from structural adhesive joints to popular confectionaries such as chewing gum. In the first chapter, a double cantilever beam (DCB) specimen geometry is proposed for combinatorial fracture …
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Topographic and Surface Chemical Aspects of the Adhesion of Structural Epoxy Resins to Phosphorus Oxo Acid Treated Aluminum Adherends
Structural adhesive bonding offers several advantages over other types of joining. These include improved stress distribution and increased design flexibility. Adhesive bonding is important in aerospace, automotive, and packaging applications. However, the full potential of the technology has not …
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An evaluation and development of bonding technologies for rapid disassembly of automotive vehicles
… scenarios. In this thesis, the innovations in adhesive disbonding technologies were comprehensively reviewed and divided into three categories of potential methods for disassembly of adhesive joints: general/conventional methods, tailored adhesive formulations, functional additives. It was …
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THE DURABILITY OF PHENOLIC ADHESIVES
… superior durability claimed for phenolic-based adhesives, in hot humid conditions. The systems under study were the nitrile-phenolics AF-10 and AF-30 (3M), the vinyl-phenolic Redux 775 and the modified epoxide Redux 312 (Ciba-Geigy). The AF-30 structural adhesive was used with and without the …
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Chromic acid anodized Ti-6Al-4V: its characterization and its single lap bond strength to heat resistant adhesives
Anodized Ti-6Al-HV/adhesive bonds exhibit improved corrosion resistance and a higher strength-to-weight ratio compared to conventional metal bonding techniques for primary and/or secondary structural applications. This work was conducted to identify chromic acid (CA) anodization and bond process …
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Experimental and Numerical Methods for Characterizing the Mixed-Mode Fracture Envelope for a Tough Epoxy
… requirements of MIL-PRF-32662 Group-I-classified adhesives. PR-2930 is a high-strength, high-toughness, epoxy-based adhesive intended for automotive and aerospace applications. As PR-2930 functions as a structural adhesive, quantification of its mechanical properties and limit-states is a …
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Deformation and fracture of PMMA with application to nanofoaming and adhesive joints
… of the thesis explores the fracture behaviour of structural adhesive (e.g. MMA)-based joints. An adhesive layer within such a joint is prone to defects such as (micro)voids and (micro)cracks. The ability to accurately predict the failure strength of adhesive joints as a function of pore or crack …
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Crystallization, Morphology, Thermal Stability and Adhesive Properties of Novel High Performance Semicrystalline Polyimides
… based polyimide was also tested extensively as a structural adhesive using Ti-6Al-4V coupons. Additionally, these polyimides are based on monomers, that are presently commercially available. The bulk thermal stability of the polyimides was first evaluated using dynamic and isothermal …
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Experimental investigation of the effects of imperfections on the behavior of composite scarf joints
… composite material and 3M Scotch-Weld Structural Adhesive Film AF 555M using controlled processing techniques, some of which were specifically designed to handle the particular details of this work. The achieved geometry of all specimens for each case show successful implementation of …
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Toughening of cyanate ester networks with reactive thermoplastic modifiers
… as potential candidates for high temperature adhesives and composite matrices. Low toughness is a major drawback with most crosslinked thermosetting materials, including the cyanate ester networks. Considerable attention has been devoted to the aspect of toughening such brittle networks in our …
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The sensitivity of composite scarf joints to the height of the blunt tip
… there is a growing need to understand the structural behavior of these composite structures after repair. In this work, a numerical and experimental investigation was conducted to characterize the sensitivity of the behavior of the composite scarf joint, particularly with regard to failure, …
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Experimental and Theoretical Studies of Friction and Adhesion of Elastomeric Materials
… is developed to predict the bond strength of adhesive systems. The proposed scaling law, which depends on the rate of change of bond area with compliance, is in apparent discrepancy with the previously reported scaling relationship that depends on the ratio of area to compliance. This …
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The Effect of Chemistry and Network Structure on Morphological and Mechanical Properties of Diepoxide Precursors and Poly(Hydroxyethers)
… moduli with phosphine oxide incorporation. Adhesive strengths to steel increased from ~9.7 MPa with bisphenol-A epoxy to ~13.8 MPa when the phosphine oxide containing epoxy was incorporated into the network. Within carbon fiber/vinyl ester composites, a series of tough ductile thermoplastics …
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Bond exchange reactions in high temperature thermoset polymers
… bonding towards potential utility as an adhesive for in-space assembly. Interchain transesterification (ITR) is a type of bond exchange reaction accessible by polymers possessing ester bonds. Thermoset polymers that have a high density of exchangeable bonds are referred to in the …
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Polymer Stabilized Magnetite Nanoparticles and Poly(propylene oxide) Modified Styrene-Dimethacrylate Networks
Magnetic nanoparticles that display high saturation magnetization and high magnetic susceptibility are of great interest for medical applications. Nanomagnetite is particularly desirable because it displays strong ferrimagnetic behavior, and is less sensitive to oxidation than magnetic transition …