Evaluation of composite debris modeling method for high loading rate events

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Baum, Nathaniel John
Keshavanarayana, Suresh R.
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The objective of this study was to assess the effectiveness of debris modeling for simply connected composite laminates at high loading rates using an adaptive mesh method in Finite Element Analysis (FEA). Double shear [45/90/-45/0]8 unidirectional tape composite laminates connected with Hi-Lock® fasteners and simple pin and were physically tested in pin-bearing conditions at stroke rates of 500, 300, and 100 in/s. Finite element simulations that did not account for debris could not match strain and load results recorded from physical testing. This thesis applied the adaptive mesh to approximate composite debris formed when the pin/ fastener crushed the laminates in the bearing response. Strain and load data of the adaptive mesh simulations were compared to simulations with no account for debris and the results collected from the physical testing. Results indicated that the adaptive mesh is an effective method for approximating debris. However, there was load rate dependency on the effect of the debris. The adaptive mesh showed greater improvement for the higher loading rates. Simulation behavior, with and without the adaptive mesh, could not match strain and load behavior from physical testing at the 100 in/s load rate condition. The connection type also had an effect on debris results. All pin connections experience more improvement in strain and load results than the fastener scenarios. For the pin connections, simulations captured debris build up and laminate bending. This improved strain and load results in not just values, but time histories as well. This indicates the adaptive mesh debris approximation is not an effective method for connections with clamp-up forces.

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Thesis (M.S.)-- Wichita State University, College of Engineering, Dept. of Aerospace Engineering
Wichita State University
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