VISCOSITY MEASUREMENTS FOR INTERLAYER STRENGTH AND FAILURE IN ADDITIVELY MANUFACTURED PARTS
Gunduz, Ibrahim E.
MetadataShow full item record
Additive manufacturing (AM) holds considerable potential in the fabrication of multifunctional composites as well as printing components with optimized three-dimensional (3D) complex geometries layer by layer. However, the mechanical and thermal properties are not optimal for high precision and high performance applications. As the AM methods are transitioning from prototyping to fabrication, the interfaces between the precursor material properties, process parameters, structural resistance, and interlayer characteristics of 3D-printed parts are to be established. For AM applications using powder-based mixtures, it is necessary to understand the rheological properties of these non-Newtonian materials and their effects on deformation, stress, and viscosity, typically measured using a capillary rheometer. This research is focused on the viscosity of non-Newtonian heterogeneous polymer and powder mixtures used for direct-write AM using capillary rheometry and a custom measurement system for small-scale testing. This will help us understand the effects of deformation, stress, and viscosity to improve printed part properties such as interlayer strength.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Strader, Joshua M. (Monterey, CA; Naval Postgraduate School, 2020-12);When small, macroscopic, solid particles (like glass beads or grains of starch) are immersed in Newtonian fluids (like water or glycerol), the resulting material demonstrates solidification under sudden driving, like from ...
The effect of interface shock viscosity on the strain rate induced temperature rise in an energetic material analyzed using the cohesive finite element method Prakash, Chandra; Gunduz, I. Emre; Tomar, Vikas (IOP Publishing, 2019);In this work, shock induced failure and local temperature rise behavior of a hydroxyl-terminated polybutadiene (HTPB)—ammonium perchlorate (AP) energetic material is modeled using the cohesive finite element method (CFEM). ...
Clark, Abe; Dijksman, Joshua; Krizou, Nasser F.; Brassard, Marc; Causley, Neil; Strader, Joshua (APS, 2021-03);This talk will summarize our recent work on moderate- and high-speed impacts into (1) dry granular media, (2) dense suspensions and (3) fluid-saturated granular beds. We show experimental, computational, and theoretical ...