Date of Award

4-2018

Degree Name

Master of Science

Department

Mechanical and Aerospace Engineering

First Advisor

Peter Gustafson, Ph.D.

Second Advisor

Jennifer Hudson, Ph.D.

Third Advisor

Tianshu Liu, Ph.D.

Access Setting

Masters Thesis-Open Access

Abstract

Artificial turf is frequently used in sports today and attempts to advantageously replicate a natural grass/soil playing surface. Despite numerous advantages, the technology is correlated with an increase in injuries. The concept behind this research is to create and validate a discrete element model (DEM) for the ground/foot interaction through the use of open source software. After validation, the goal is to analyze an arrangement of studs to determine what role stud geometry plays on torque [N-mm] and force [N] generation. The validation data was provided through laboratory experiments. Three football studs attached to a rigid bracket were turned at 1 degree per second in artificial grass, rubber infill, and grass+infill on a servo hydraulic load frame for 60 seconds. Torque and axial force were sampled at 100Hz.

A trial and error approach was employed to calibrate the elastic modulus, Poisson’s ratio, and density until it had a similar output to the validation data provided by the load frame. Through this approach, the DEM model was able to yield results within a 2% difference for average torque relative to the validation data. DEM simulations demonstrated stud geometry appears to play a significant role in torque and force generation.

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