...Douglas E. Spearot; Alex Sudibjo; Varun Ullal; Adam Huang Recently, metal particle polymer composites have been proposed as sensing materials for micro corrosion sensors. To design the sensors, a detailed understanding of diffusion through metal particle polymer composites is necessary. Accordingly...

... with a thermoplastic binder, followed by a debinding stage that permits to evacuate the polymeric binder, and then followed by a sintering stage by solid state diffusion that normally leads to a nearly dense component. The main defects arising during MIM processing are associated with powder segregation during...

... and those that are damage related (i.e., cracks and cavities). The development of undesirable/nonuniform microstructures and cavities during the mill processing of alpha/beta titanium alloys is addressed first. Relatively simple, diffusion-based models of spheroidization and coarsening are applied...

...K. V. Pochiraju; G. P. Tandon This paper describes modeling of degradation behavior of high-temperature polymers under thermo-oxidative aging conditions. Thermo-oxidative aging is simulated with a diffusion-reaction model in which temperature, oxygen concentration, and weight-loss effects...

... and humidity. For this purpose, a two-dimensional cohesive-layer constitutive model with a prescribed traction-separation law is constructed from fundamental principles of continuum mechanics and thermodynamics, taking into account strain-dependent, non-Fickian hygrothermal effects as well as diffusion-induced...

... chemical potential diffusion Graphite fiber–polyimide matrix composites represent an important class of materials for use in airframe (wings and control surfaces), cryotanks and propulsion systems and other secondary support structures in future space transport due to their high specific stiffness...

... diffusion from cutting tool into the titanium chip is proposed in this paper. This cobalt diffusion is a function of cobalt mole fraction, diffusion coeficient, interface temperature and chip velocity. The wear analysis includes theoretical modeling of the transport-diffusion process, and obtaining tool...

...Levent Aktas; Youssef K. Hamidi; M. Cengiz Altan The common methods used to determine the diffusion coefficients of polymer composites are based on the solution of Fickian diffusion equation in one-dimensional (1D) rectangular domain. However, these diffusivities usually involve errors primarily...

... are considered, and diffusional transformations are contrasted with martensitic ones. Assuming the same dissipation for the rearrangement of all substitutional components and no dissipation due to diffusion in an interface in the case of a multicomponent diffusional transformation, we show that the chemical...

.... Associate Editor: S. Meguid. 14 April 1999 22 September 2000 stress relaxation yield strength creep plastic deformation austenitic stainless steel yield stress ageing diffusion finite element analysis Austenitic stainless steels have been used architecturally in building...