Influence of the Adhesive Thickness on the Energy Release Rate of Adhesively-Bonded Composite Repairs
In this work, the energy release rate of adhesively-bonded composite repairs is analyzed for fracture Mode I and Mode II. Experimental tests on Double Cantilever Beam and End-Notched Flexure specimens were conducted following the recommendations of the standards. A brief description of the experimental procedure is included. The influence of the adhesive thickness on the energy release rate is studied. Results, which represent the initiation and propagation of the crack, showed different behavior on each mode. Fracture toughness of mode I decreases with the adhesive thickness increment, while fracture toughness of mode II increases.
University Carlos III of Madrid, Lorena Fernández-Cañadas, Inés Iváñez, Sonia Sanchez-Saez
West Virginia University, Ever Barbero
Atomic-Scale Simulation for the Analysis and Optimization of Advanced Thermoset Composites
The development of thermoset polymer materials that deliver the required properties for diverse applications has historically been a costly, time-consuming trial-and-error process. Atomic-scale simulation at the molecular dynamics (MD) and quantum mechanical (QM)level can provide an alternative and accelerated route. Simulations of the curing process, thermophysical property prediction and reactivity analysis can establish fundamental structure-property relationships for the rational development of high-performance thermoset systems. In this work, examples are presented for epoxy thermosets.
Schrodinger, Inc., Thomas Mustard, Jeffrey Sanders, Matthew Halls, Alexander Goldberg,
Shaun Kwak, Jacob Gavartin, Stephen Christensen
An Example of Application of Milkweed Fiber: Door Panels for Automotive Applications
This poster presents the first step of a research project on the use of milkweed fiber as an alternative to flax fiber for reinforcing PP in door panel applications. The specification for the properties and characteristics of the “expected” composite panel are listed as well as the procedure to prepare milkweed containing PP plates. Properties, including mechanical strength, density and microstructure, of milkweed materials are compared to standard flax panels.
University of Sherbrooke/Civil Eng., Patrice Cousin, Pierre Olvaque, Mathieu Robert
Surface Characterization Using Inverse Gas Chromatography (Igc) Methods
Inverse Gas Chromatography, while well-known for measuring the surface energies of powders, is a relatively new method for characterization of the surface energy of composite materials. With the development of a clamp shell attachment to accommodate cured composite samples, this dynamic technique provides a heterogeneous distribution and profile of the composite’s dispersive and specific (acid-base) surface energies.
University of Washington, Rita Johnson, Brian Flinn
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