Graduate Degree Type
School of Engineering
Void formation is a common problem in many composite material manufacturing processes. Composites fail when micro-cracks, which usually originate at voids, propagate through the material. The mechanical properties of a lamina depend not only on the constituent properties, but also on the tow packing configuration, void content and void distribution. This paper develops a method to determine the mechanical properties of a tow and lamina and develops a progressive failure model to predict the strength of a lamina with varying void content, void distribution and tow packing configuration, using finite element analysis.
The strength a lamina with various tow packing configurations, void content and void distribution were investigated utilizing the progressive failure model. The tow packing configuration can affect the strength of a lamina by approximately 25 percent. Voids located near the gaps between the tows severely affect the strength of the lamina. The transverse stiffness of tows in a lamina also significantly affects the failure strength and strain of the lamina.
Maletta, Michael, "The Development of a Progressive Failure Model of a Fiber-Rein forced Composite Lamina" (2008). Masters Theses. 676.