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.
Results
Showing 1 to 20 of 24 for “"interfacial failure"”.
-
Computational modelling of interfacial failure behaviours in polymer–metal joints
… developing a better strategy to achieve enhanced interfacial properties in polymer–metal/metal oxide joints using computational techniques such as density functional theory (DFT), molecular dynamics (MD), and dissipative particle dynamics (DPD) methods. Our calculations provide support to a …
-
Fracture analysis of carbon fiber/epoxy matrix interface through microbond and cruciform tests
… tests, used to characterize the normal and shear interfacial failure of a carbon fiber/epoxy matrix system. The first part of this study is devoted to the simulation of the microbond test, in which, a drop of epoxy deposited on a carbon fiber is subjected to a longitudinal load, which eventually …
-
Behavior and Flexure Analysis of Balsa Wood Core Sandwich Composites: Experimental, Analytical and Finite Element Approaches
… Test data on bending rigidity, critical interfacial failure (skin-to-core interface) and shear stress are collected and analyzed. The load-deflection curves plots up to the point of failure initiation are being studied. The effects of the span and the radius of the loading nose on the …
-
Particulate composite material internal deformation measurements using x-ray microtomography and digital volume correlation
… study the internal deformations and evolution of failure in 3D, we use a model composite material (cylindrical 15 mm in height and 10 mm in diameter) with a series of different well-controlled microstructure configurations. A simple microstructure arrangement consisted of precisely positioned …
-
Tissue-material interactions : bioadhesion and tissue response
… biomaterials directly influence the success or failure of therapeutic interventions. The nature and extent of these interactions strongly depend on both the tissue and material in question and can presumably be characterized for any given clinical application. Nevertheless, optimizing …
-
Lyocell Fiber-Reinforced Cellulose Ester Composites-Manufacturing Considerations and Properties
… absorption. However, SEM results revealed interfacial failure and extensive fiber pull out. Relatively larger fiber and matrix regions were present on the scale of 10<sup>-3</sup>m. Solution prepregging technique using methyl ethyl ketone (MEK) as a solvent for CAB and continuous fibers as …
-
IGFEM-based reduced-order modeling and design of nonlinear composites
… work, a powerful nonlinear solver to model the failure of composite materials is developed using an Interface-enriched Generalized Finite Element Method (IGFEM). Cohesive interfacial failure and damage mechanisms in the constituents are the primary source of nonlinearity and the shape of …
-
Effect of network structure on lignin-derived polyurethane film properties
… Analysis (ESCA) revealed the formation of interfacial bonds on the surface of the cellulose acetate adherend. Furthermore, it was indicated that failure occurred well within the bulk of the cellulose acetate while interfacial failure was apparent for the cellulose tri-acetate model. While …
-
Time- and Temperature-Dependence of Fracture Energies Attributed to Copper/Epoxy Bonds
… energies corresponding to related, high-speed failure events. Work (or energy) is required to create new surface area—with associated dissipation events—during fracture, and this energy (for a given material system) is dependent on the speed of crack propagation, the locus of failure, and the …
-
Determining Interfacial Adhesion Performance and Reliability for Microelectronics Applications Using a Wedge Test Method
… for characterizing material resistance to interfacial failure and for making interface reliability predictions. Because interfacial bond integrity is a major concern for performance and reliability, the need to evaluate the fracture and delamination resistance of an interface under …
-
Micro & nano scale mechanical testing and assembly with applications to metal based microsystems
… previous procedures for testing film/substrate interfacial mechanical integrity, results obtained by following this new microscale testing protocol have less scatter and are more conducive to correlating interfacial structure/chemistry to interfacial failure. Appropriate bonding technology is …
-
Investigation of acid/base interactions in adhesion
… interactions were possible demonstrated superior interfacial performance. This improvement was seen in the bond’s ability to resist adhesive (interfacial) failure at debond rates at which other bonds failed. When the test geometry was changed such that the stress intensity at the interface was …
-
The response of aluminium and glass fibre FMLS subjected to blast loading
… the properties constitutive materials and interfacial bond strength. Bond strength between the composite and metal interfaces was improved by employing a combination of surface treatments, consisting of both mechanical and chemical as well as the use of a film adhesive. FMLs were …
-
Theoretical modeling of the actuation mechanism in integrated induced strain actuator/substructure systems
… actuator on actuation force/moment transfer and interfacial shear and peeling stress distributions that the existing analytical models fail to describe. Good agreement was obtained between the current model and the finite element analysis in terms of predicting actuation force/moment transfer. …
-
Water based adhesive primers on aluminum substrates
… and the crack length increased. The locus of failure also changed from cohesive failure in the adhesive for the lower temperature aged samples to a mixed mode of cohesive failure and aluminum oxide-primer interfacial failure for the 80°C aged samples.
-
Factors Affecting the Structural Integrity of Wood-Based Composites: Elevated Temperature and Adhesive Bonding
… adhesives. The new tests method yields a high interfacial failure rate and successfully identifies differences in the performance of the three adhesives. SPG (one species of the rotary-peeled veneers) demonstrates a rising R-curve behavior (an increase in the fracture toughness with crack …
-
Identification of the Mechanism of Oxide Scale Fracture, and its Correlation with Strain Using Acoustic Emission.
… test technique has been developed to measure the failure strains and to study the failure mechanisms of brittle layers in tension and compression. Tests were made with iron oxide and nickel oxide at room temperature and 550 or 900 °C, respectively, using strain rates of 10~* and 10"5 s"1 . Brittle …
-
Evaluating Thermal and Mechanical Properties of Electrically Conductive Adhesives for Electronic Applications
… aging, and there was a transition from cohesive failure to interfacial failure as aging continued. A comparative study of the durability of different conductive adhesive and substrate metallization combinations suggested that the resistance of the adhesive joints to moisture attack is related to …
-
Durability of sheet molding compound/metal adhesive bonds
… adhesive bonds, all visually determined adhesive failure occurs at the SMC/adhesive interface, and it is in reality a mixture of interfacial failure and near surface SMC debonding. The near surface SMC material and the thin layer of primer on the SMC surface are the weak links in the bond. An …
Page 1 of 2