Investigation of Slip Kinematics in an Ultra High Molecular Weight Polyethylene (UHMWPE) Laminar Composite Model
Technical Report,01 Aug 2019,31 Oct 2019
US Combat Capabilities and Development Command, Army Research Laboratory Aberdeen Proving Ground United States
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Inclusion of explicit slip kinematics in a model for ultra-high molecular weight polyethylene fiber composites is investigated as a means of accommodating finite slip between the composite lamina with the goal of more efficient computations than explicitly depicting multiple slide surfaces through the thickness of a panel. The approach assumes finite shear in the plane of the fiber with plastic spin to accommodate the relative rotation. The stress is the sum of contributions from the fibers and the matrix material, with the enhanced kinematic description encompassed by the matrix. Results from preliminary simulations show that, while the model represents slip as intended, there is undesirable coupling among the different element layers that can be sufficiently severe to cause premature fiber failure. Simulations with multiple explicit slide surfaces have substantially more degrees of freedom, and they do not experience this adverse coupling. It is concluded that including slip kinematics in the composite constitutive relations is a viable approach for reducing the computational burden of the simulations prior to fracture but not beyond.