Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 57 for “"printability"”.
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Direct Extrusion Printability of Internal Phase Nanostructured Hydrogels
An experimental study in open-air direct extrusion of fatty acid-based ternary system gels is presented. When promising self-supporting mechanical abilities are observed in some pure ternary experiments, photoinitiators and hydrogel monomers are introduced to stabilize structures printed from these …
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Enhancing the printability of food inks and the structural stability of 3D-printed food through additive food manufacturing
… as hydrocolloids to investigate their effect on printability and the structural properties of the 3D-printed samples. To assess the dimensional and structural properties of the printed samples, various infill densities (20 percent, 40 percent, and 60 percent) and designs (line, concentric, and …
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Property-Process-Property Relationships in Powder Bed Fusion Additive Manufacturing of Poly(phenylene sulfide): A Case Study Toward Predicting Printability from Polymer Properties
… in this dissertation contributes to the "printability triad'" of Structure-Property-Process relationships and does so using the novel-to-PBF polymer, PPS. Additional polymers must be explored to continue to discern which polymer-manufacturing relationships are universal among all polymers …
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The development of novel hybrid poly (2-oxazoline)-based bioinks for 3D bioprinting: a comparative study with Pluronic F127
… offer adjustable mechanical properties and good printability, and they are often used as sacrificial materials in 3D bioprinting. Hybrid hydrogels consisting of Pluronic F127 (PF) and natural polymers have been suggested to have good printability and rheological behaviors. However, PF tends to be …
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STRATEGIES TO IMPROVE SHRINKAGE RESISTANCE OF CEMENT-BASED MATERIALS FOR EXTRUSION-BASED 3D PRINTING
… material and processing parameters that affect printability; ii) investigate the influence of water-to-cement ratio, superplasticizer dosage, and welan gum content on mortar printability; iii) propose a “printability window” where rheological properties and desorptivity can secure successful …
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Additive Manufacturing of Commercial Polypropylene Grades of Similar Molecular Weight and Molecular Weight Distribution
… with other materials to improve the printability has been investigated, variation in properties of commercial PP grades, of similar molecular weight (MW) and molecular weight distribution (MWD), on printability is still to be investigated. Those commercial PP grades can have wide …
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Physics-informed data-driven frameworks for materials discovery
… models are developed for the classification of printability and glass transition temperature (Tg) in additive manufacturing processes. By integrating fundamental principles of physics into the machine learning models, this chapter demonstrates improved accuracy and reliability in predicting …
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Enabling New Material and Process Capabilities for Ultraviolet-Assisted Direct Ink Write Additive Manufacturing via Exploration of Material Rheology and Reactivity
… inks and the relationships between rheology and printability. An in-depth literature review of the techniques and relationships was compiled to better understand ink requirements for successful printing (Chapter 2). This broad survey is not limited to only UV-DIW, but includes all variations of …
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Investigating Shear-induced Damage during Hydrogel Extrusion-based Manufacturing: Rheological Insights and Mechanophore Incorporation
… is significantly disrupted. Initially, the “printability” of poly(acrylamide/methyl acrylate) hydrogels was investigated at a range of water content levels by linking printing assessments with characterisation of the rheological parameters, such as loss tangent (tan δ), yield stress (τ_y) and …
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Advancing sustainability in additive manufacturing: material formulation and process development for recycled PET and PET/HDPE blend
… improving its melt strength, viscosity, and printability for filament-based 3D printing. Secondly, compatibilization strategies were implemented to improve the interfacial adhesion, phase dispersion, and mechanical properties of r-PET/r-HDPE blends, making them viable for pellet-based 3D …
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Strategies to design and optimize natural polymers as biomaterial inks for musculoskeletal tissue engineering applications
… aiming to address critical challenges in printability and biocompatibility for bone tissue engineering applications. Most of the research was carried out on silk fibroin, a protein commonly used for tissue engineering scaffold fabrication owing to its promising physical and biological …
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Mix design and testing improvements for 3D printable concrete mixtures with fibers
… mix proved difficult to develop for consistent printability even with only basic ingredients. The authors shifted to exploring what factors make a mix printable and measuring these factors with simple and robust field tests. The authors developed a new design philosophy for 3D printing concrete …
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Fabrication of PLA-hemp 3D printing filaments
… while maintaining mechanical performance and printability. The methodology involves fabricating composite filaments from 2 mm PLA pellets and 0.4 mm hemp fiber particles. Hemp fiber at varying weight ratios (5 wt%, 10 wt%, and 15 wt%) was extruded using a single screw extruder. The optimal …
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The rheology of silicon nanoparticle inks fro screen printing electronic devices
… was also seen to follow a Windhab model. The printability of the inks primarily depends on the shear-dependent viscosity as highly viscous and dilute inks do not produce good printed structures. The printed layers showed electrical and optical activity.
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Automated visual inspection for the quality control of pad printing
… rate. Ultraviolet-cured inks with improved printability were developed. The image normalisation/ error-signalling stage in inspection was proven in isolation, as was the pattern recognition system.
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Thermo-mechanical characterisation of energetic materials for additive manufacture
… Initially, a new framework for considering the "printability" of energetic materials is proposed, in which different physical and rheological properties of the material are assessed against different unit processes used in additive manufacturing techniques. A series of experiments are then …
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The Influence of Time-Dependent Rheology on the Multiple Scales of 3D Printing with Cementitious Materials
… that it is not feasible to use a conventional printability metric to reflect the entire printing process. To help this production technology translate more rapidly, manufacturers need new tools and clear quality control metrics that will link their formulations to the final print performance …
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Structure-property-processing relationships between polymeric solutions and additive manufacturing for biomedical applications
… engineering, this dissertation aims to relate printability of polymeric materials with three types of AM processes, namely vat photopolymerization, binder jetting, and powder bed fusion. Binder jetting, vat photopolymerization, and powder bed fusion require different viscosity and powder …
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Improving the strength of fused filament fabrication parts by non-planar alignment of material extrusion wih stress vectors
… surfaces whilst preserving local boundaries and printability. Approach validation occurs through simulation and physical testing. Physical testing confirms mechanical property improvements, including increases in peak load (up to 22.7%), yield load (up to 34.0%), and energy absorption (up to …
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VLSI Physical Design for Manufacturability and Reliability
… in Chapter 6 for lithography. Trade-off between printability and coupling capacitance are considered. In Chapter 7, dummy features and boundary based method are proposed to enable the cell-wise optical proximity correction (OPC) for 32nm node and beyond. It will saves weeks of computation on …
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