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Full-Text Articles in Mechanical Engineering
Fused Filament Fabrication Of Ceramic Matrix Composite Preforms Via Thermo-Oxidative Stabilization Of Polyetheretherketone, Samuel Pankratz
Fused Filament Fabrication Of Ceramic Matrix Composite Preforms Via Thermo-Oxidative Stabilization Of Polyetheretherketone, Samuel Pankratz
Masters Theses
Carbon-fiber-reinforced ceramic matrix composites (CMCs) are frequently used in applications where high thermo-mechanical loads are induced along with weight limitations. The first step of producing the fibrous preform allows the near-net shape of the final part to be formed with fibers placed in the desired orientation, typically relying on traditional polymer matrix composite (PMC) manufacturing methods. Recent work has demonstrated a new method to produce discontinuous fiber preforms through various forms of additive manufacturing including fused filament fabrication (FFF). This work uses Polyetheretherketone with carbon fibers (CF PEEK) for additive manufacturing of the carbon-rich polymer precursor. Critically, thermoplastic precursor materials …
In Situ Process Monitoring And Machine Learning Based Modeling Of Defects And Anomalies In Wire-Arc Additive Manufacturing, Eduardo Miramontes
In Situ Process Monitoring And Machine Learning Based Modeling Of Defects And Anomalies In Wire-Arc Additive Manufacturing, Eduardo Miramontes
Masters Theses
Wire Arc Additive Manufacturing (WAAM) has made great strides in recent years however, there remain numerous persistent challenges still hindering more widespread adoption. Defects in the parts produced degrade their mechanical performance. Inconsistency in the geometry of the weld beads or undesirable anomalies such as waviness, or humps can lead to loss of geometric accuracy and in extreme cases, when anomalies propagate to subsequent layers, build failure. Such defects can be mitigated by a controls framework, which would require a model that maps undesirable outcomes to information about the process that can be obtained in real time. This thesis explores …
Assessing Mechanical Performance Of Dissimilar Steel Systems Made Via Wire-Arc Additive Manufacturing, Obed Daniel Acevedo
Assessing Mechanical Performance Of Dissimilar Steel Systems Made Via Wire-Arc Additive Manufacturing, Obed Daniel Acevedo
Masters Theses
Hot stamping is part of a specific type of metalworking procedure widely used in the automotive industry. This research seeks to help make hot stamp tooling component production more cost-effective by using large-scale additive manufacturing. Additive manufacturing can produce dissimilar steel components that can be more cost-effective and time-efficient and allow for complex geometries to be made. A dissimilar steel system consisting of 410 martensitic stainless steel and AWS ER70S-6 mild steel is proposed to make hot stamps, making them more cost-efficient. However, the material interface's mechanical behavior in 410SS-mild steel additively manufactured material systems is not well understood. This …
Design Of A Cable-Driven Manipulator For Large-Scale Additive Manufacturing, Phillip Chesser
Design Of A Cable-Driven Manipulator For Large-Scale Additive Manufacturing, Phillip Chesser
Masters Theses
Additive manufacturing of concrete is a growing field of research, yet current motion platforms do not offer viable routes towards large scale deployable systems. This thesis presents the design and analysis of a novel cable-driven robot for use in large scale additive manufacturing. The system developed, termed SkyBAAM, is designed to be easily deployable to a construction site for on-site additive manufacturing of buildings and other large structures. The design philosophy behind this system is presented. Analysis of this system first explores the kinematics, and stiffness as a function of cable tension. Analysis of the workspace and singularities is also …