Design of Variable Stiffness Composite Panels for Maximum Strength

<p>The purpose of this research is to explore the design of variable stiffness composites and develop an automated framework to model, analyze and optimize these structures. Variable stiffness composites have been shown to exhibit increased strength and stiffness over traditional constant stiffness composites by tailoring fiber orientations for specific load conditions. This is achieved by allowing the fiber orientation to vary spatially across the design domain. Motivation for new design methods is driven by the recent advancements in composite additive manufacturing, such as automated fiber placement machines, which allow fiber reinforcements to be placed along prescribed trajectories during manufacturing. Through this research the problem of optimized orthotropic material orientation will be investigated. A new methodology is proposed that uses the concept of structural load flow to determine fiber trajectories. Fiber designs using the load path method are compared to the classical approaches such as the strain, stress, and energy methods. The load path function method is also expanded upon to solve the problem of non-homogenous equilibrium equations. This method allows load paths to be determined for more complicated loads such as aerodynamic pressures, thermal and inertial loads. Additionally, the design considerations for 3D printed composites are addressed. Experimental validation of the finite element codes used to model 3D printed composite structures is presented.</p>

Name thesis:degree_name

Master of Science in Aerospace Engineering

Level thesis:degree_level

Thesis - Open Access

Discipline thesis:degree_discipline

Aerospace Engineering

Year

2017

Author dc:creator

• Hurley, Joel P.

• variable stiffness
• composite panels
• Aerospace Engineering
• Structures and Materials

Repository record dc:identifier

https://commons.erau.edu/edt/366

OAI identifier oai:identifier

oai:commons.erau.edu:edt-1365