Improving Damage Tolerance of Composite Sandwich Structures Subjected to Low Velocity Impact Loading: Experimental and Numerical Analysis
Date of Award
Thesis - Open Access
Master of Science in Aerospace Engineering
Dr. David J. Sypeck
First Committee Member
Dr. Dae Won Kim
Second Committee Member
Dr. Feng Zhu
Sandwich structures with composite facing skins have seen applications in variety of sectors including aerospace and automobile, owing to their high specific mechanical properties. However, there is a need to develop better damage tolerant sandwich structures since conventional composite facing skins exhibit low impact resistance in the transverse direction. Here, composite skin sandwich structures with three different impact resistant core materials were fabricated and tested both experimentally and numerically. Neat CFRP and 2024-T3 aluminum alloy sheets were also investigated. Cores utilizing impact resistant D3O® were found to have very favorable weight specific energy absorbing properties at higher impact velocities as compared to those made from Nomex® or Sorbothane® cores. Nonlinear finite element analysis was also performed using Hypermesh/LS-DYNA for 2024-T3 aluminum alloy sheet, neat CFRP and sandwich with Nomex® core with CFRP faceskins. Numerical vs. Experimental impact results were compared and comments regarding impact behavior of different candidate materials were made. CAI tests were performed for CFRP sandwich structures. Sandwiches with cores made out of D3O® and Sorbothane® showed more ductility when compared with Nomex® core sandwich composite.
Scholarly Commons Citation
Gondaliya, Ravi B., "Improving Damage Tolerance of Composite Sandwich Structures Subjected to Low Velocity Impact Loading: Experimental and Numerical Analysis" (2016). Doctoral Dissertations and Master's Theses. 300.