Optimization of thin flexible compression column for implementation into weight bearing garment
Date
2020
Authors
Vanarelli, Alex
Journal Title
Journal ISSN
Volume Title
Publisher
University of Delaware
Abstract
This thesis provides a comprehensive design methodology for a confined thin, flexible compression column intended for integration into a load-bearing upper torso wearable garment that transfers loads on the shoulder (body armor, rucksack, backpacks, etc.) to the waist for injury prevention and mitigation of caloric cost without sacrificing flexibility, comfort, and function. ☐ The study begins with the development of the initial proof of concept design based on a flexible composite column encased between rigid lateral constraints (Continuous Floating Constraint Buckling Column), that increases compression load capacity by forcing the flexible column into higher buckling modes. The concept, in various configurations, is proven out experimentally. A dynamic FEA model of the experiments is developed and in good agreement with the experimental results. The model accurately predicts experimental load, displacement, lateral reaction forces, stresses, strains, and modal shapes for a range of geometric variables and material properties. It also provided a methodology for improving flexibility in the Continuous Floating Constraint Buckling Column design. ☐ An advanced design concept replaces the continuous floating constraints with a segmented approach (The Segmented Constraint Column) that significantly improves overall flexibility of the system. To retain comparable load capacity, a series of lateral circumferential supports using high performance yarns was integrated into the garment design to prevent outward buckling while the wearer’s body prevented inward buckling. This configuration was built and tested as a proof of concept for a final design of a wearable upper torso shirt improving flexibility significantly from no deflection and rotation to .77” deflection and 14° rotation under load for 6” configuration, and load capacity to a total of 300 lb.
Description
Keywords
Composites, Constrained buckling, Design, Dynamic/Explicit Analysis, Flexible structures, Wearable structures, Injury prevention