Title: Developing finite element model parameters for root growth under pavement

Summary: This presentation is largely the same as the Landscape Below Ground III presentation, with some additional data on a styrofoam failure replication study to be complete in December 2008 and any updates on the FEA models tested, as informed by the root-foam data in growth patterning. The foam work is done in association with Dr. Smiley of the Bartlett Research labs. FEA modeling and load press data conducted with the Center for Advanced Infrastructure and Transportation at Rutgers University The presentation discusses the need to define material behavior and geometry of interest in developing a finite element model. The method of using a mechanical root was described in 2005 at the ISA Nashville conference, but its context in FEA will be discussed. A study in replication of foam deformation by root growth under pavement will be described. Roots which had grown between foam sheets under pavement in a study by Bartlett Research Labs were shipped to Rutgers for testing. the roots were sectioned to develop growth pattern and used to create a root loading spline to replicate foam failure in a universal loading press. The data was used to define load patterning in FEA models and will discuss pattern significance in a system which by design offered an testable opportunity for equal growth direction. Implications for design rules as informed by the models (either in development or in summation) will be presented as a conclusion

Jason Grabosky, Ph.D., Rutgers University, Dept. Ecology Evolution & Natural Resources, New Brunswick, NJ, United States

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