Permeability measurement of 3D-printed controlled-porosity deltoid inserts for composite T-joints
Liquid Composite Molding (LCM) processes are one of the most common ways to produce composite material structures for various high-performance industries, especially for aerospace applications. LCM processes include resin transfer molding (RTM) and vacuum assisted RTM (VARTM). A key challenge with the LCM process is how to fully impregnate the dry fiber preform with resin inside the mold. Limited research has been conducted to investigate the resin flow behavior in critical regions of complex geometry, such as the junction between the flange and web in T-joints (referred to as a deltoid). This area is very important to the structural integrity and long-term durability of the T-joint, yet it is often ignored, leading to a resin-rich area. This study describes initial work aimed at producing custom-designed deltoid inserts with controlled porosity using additive manufacturing. Two different porosity geometries were developed, and deltoid shapes were produced with each one. The density for each porosity type was parametrically varied from 30%–70% solid (infill density). This presentation will present and discuss the permeability measurements made for each one in the three principal directions (K1, K2, K3). The 3D printed insert will have a porosity that can optimize resin flow, while simultaneously providing perfect geometric support for the plies of fabric that come together in this region.
Donald A. Klosterman
Primary Advisor's Department
Chemical and Materials Engineering
Stander Symposium project, School of Engineering
United Nations Sustainable Development Goals
Industry, Innovation, and Infrastructure
"Permeability measurement of 3D-printed controlled-porosity deltoid inserts for composite T-joints" (2022). Stander Symposium Projects. 2727.