Nancy J. Lybeck

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As engineering applications of elastomers increase in complexity , knowledge of the behavior of these materials, and the ability to predict these behaviors, becomes increasingly valuable. Elastomers exhibit a complex variety of mechanical properties, including nonlinear constitutive laws, strong damping and hysteresis (loss of kinetic and potential energy,(More)
The sinc{collocation overlapping method is developed for two-point boundary-value problems for second-order ordinary diierential equations. The discrete system is formulated and the bordering algorithm used for the solution of this system is described. It is then shown that the convergence rate is exponential even if the solution has boundary singularities.(More)
EEorts to develop sinc domain decomposition methods for second-order two-point boundary-value problems have been successful, thus warranting further development of these methods. A logical rst step is to thoroughly investigate the extension of these methods to Poisson's equation posed on a rectangle. The Sinc-Galerkin and sinc-collocation methods are, for(More)
We report on our eeorts to model nonlinear dynamics in elastomers. Our eeorts include the development of computational techniques for simulation studies and for use in inverse or system identiication problems. As a rst step towards the full dynamic case, we present the static inverse problem, with experimental results. We also present results from the(More)
—A fundamental problem in the development and validation of PHM technologies is the general shortage of realistic fault signature data. While healthy signatures can be obtained from operational systems, faults are relatively rare and difficult to observe. The PHM community must rely primarily on bench level seeded fault test data collected under a limited(More)
agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness, of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. References herein to any specific commercial(More)
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