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William O. Williams, Professor Emeritus Ph.D., Brown University Email: wow@nero.math.cmu.edu Office: Wean Hall 8130 Phone: 4122682679 Research:My research interests concern the numerical approximation of partial difMy research generally concerns the formulation and analysis of models in mechanics and thermodynamics. Most recently I have been involved in studies in mechanics whose central point is that of the effect of constraints. At the extreme point are systems which have no internal energy at all, and hence have internal forces which are purely reactions to constraints. A historical example is that of Tchebychev Nets, which were developed by Tchebychev, Servant and Voss in the last century as models for the deformation of cloth. In an older article listed below, I examined the stresses and concentrated forces possible in such systems. More recently, I have become interested in Tensegrity Structures, whose internal forces likewise are purely constraintgenerated. These structural trusses, whose elements consist of both rigid bars and cables, were originated by Snelson and developed by Buckminster Fuller, and present interesting technical and mathematical problems. Both of these systems can be treated by relaxation from elastic or partially elastic models, In work with Podio Guidugli and diCarlo I have considered the approach of treating shells as examples of constrained threedimensional bodies. This point of view leads in a natural way to twodimensional models with various degrees of microstructure. I also have a ongoing interest in mathematical models in physiology. In an older work I advanced a model for contraction of muscle fibers that can represent most observed microexperimental responses in muscle fibers; a goal is to extend this to wholemuscle models. Currently I am investigating applications of the abovementioned constrained systems to biological models. Selected Publications:
