Albert E. Patterson
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View article: Mechanical Characterization of Additively Manufactured Poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) Biopolymer
Mechanical Characterization of Additively Manufactured Poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) Biopolymer Open
Poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) (PHBH) is a biodegradable polyester with strong potential for marine and packaging applications common for thermoplastic polymers, yet its performance after being additively manufactured remain…
View article: Design and multi-objective optimization of mandibular implant models with additive manufacturing constraints
Design and multi-objective optimization of mandibular implant models with additive manufacturing constraints Open
This project explored the manufacturability-driven design of mandibular reconstruction implant models made using extrusion-based additive manufacturing. A formalized multi-objective optimization framework was presented for the identificati…
View article: Predicting the Strength of Additively Repaired Amorphous Thermoplastics Using Polymer Healing Theory
Predicting the Strength of Additively Repaired Amorphous Thermoplastics Using Polymer Healing Theory Open
Fused filament fabrication (FFF) is a widely used additive manufacturing technique. Several printing parameters, including the print speed and print (extrusion) temperature, influence the properties of the 3D printed material. For instance…
View article: Process-induced shrinking and warping in additively manufactured polycarbonate plates
Process-induced shrinking and warping in additively manufactured polycarbonate plates Open
Most thermoplastic manufacturing processes, that do not include cutting, involves the melting and re-solidification of the raw material, which results in delamination, warpage, and shrinkage. These undesirable artifacts are introduced due …
View article: Parameter Optimization for Dissimilar Aluminum Alloys Joined Using Friction Stir Additive Manufacturing: A Screening Study
Parameter Optimization for Dissimilar Aluminum Alloys Joined Using Friction Stir Additive Manufacturing: A Screening Study Open
Due to the requirement for better strength‐to‐weight ratios, the utilisation of aluminum alloys is rapidly expanding. Lightweight components are of utmost importance in most industries, particularly in transportation, aviation, maritime, a…
View article: Corrosion in laser powder bed fusion AlSi10Mg alloy
Corrosion in laser powder bed fusion AlSi10Mg alloy Open
Aluminum alloy AlSi10Mg is a widely used engineering material that offers a very high strength‐to‐weight ratio and easy processing. It is common in the aerospace, medical, and automotive industries and has excellent machining and casting p…
View article: Fatigue performance in additively manufactured metal alloys
Fatigue performance in additively manufactured metal alloys Open
The paper provides a comprehensive review on the fatigue characteristics of additive manufactured metal alloys, exploring key factors that influence their durability and underlying failure mechanisms. In addition, the article examines vari…
View article: An overview of carbon-carbon composite materials and their applications
An overview of carbon-carbon composite materials and their applications Open
Carbon-carbon composites are advanced materials known for their high strength, high-temperature stability, and superior thermal conductivity. Mechanical properties such as tensile strength, flexural strength, and compressive strength are e…
View article: Interlaminar tensile properties of raw and carbon fiber‐wrapped additively manufactured polyetherimide
Interlaminar tensile properties of raw and carbon fiber‐wrapped additively manufactured polyetherimide Open
High‐performance engineering thermoplastics are important emerging materials, particularly when processed using additive manufacturing technologies. One of the most important among these is polyetherimide, also known as PEI or ULTEM. Using…
View article: Exploring the Effect of Specimen Size on Elastic Properties of Fused-Filament-Fabrication-Printed Polycarbonate and Thermoplastic Polyurethane
Exploring the Effect of Specimen Size on Elastic Properties of Fused-Filament-Fabrication-Printed Polycarbonate and Thermoplastic Polyurethane Open
Additive manufacturing (AM) is often used to create designs inspired by topology optimization and biological structures, yielding unique cross-sectional geometries spanning across scales. However, manufacturing defects intrinsic to AM can …
View article: Size Effects in Polycarbonate and TPU 3D-Printed via Fused Filament Fabrication
Size Effects in Polycarbonate and TPU 3D-Printed via Fused Filament Fabrication Open
This paper investigates the influence of sample size and layer height on the elastic modulus of samples 3D printed by fused filament fabrication (FFF). Cubic samples of different sizes from either a stiff thermoplastic polymer (polycarbona…
View article: Spiral Development for Non-Software Product and System Engineering
Spiral Development for Non-Software Product and System Engineering Open
This article explored the spiral development process, sometimes called ”evolutionary acquisition” in military sectors, and reviewed major non-software applications in the engineering literature. The spiral development process was originall…
View article: Impact of Compact Tension Specimen Size on Fracture Toughness of FFF-Processed Thermoplastics
Impact of Compact Tension Specimen Size on Fracture Toughness of FFF-Processed Thermoplastics Open
The ASTM D5045 standard is one of the most widely-used and cited methods for estimating the fracture toughness of thermoplastic materials. It is well-established in the literature that additively-manufactured thermoplastic materials fail t…
View article: Impact of Element Layout and Notching Technique on the Fracture Toughness of FFF-Processed Thermoplastics
Impact of Element Layout and Notching Technique on the Fracture Toughness of FFF-Processed Thermoplastics Open
This work explores the effects of notching method and element layout on the fracture loading properties of thermoplastic materials processed using fused filament fabrication (FFF). Three common thermoplastic materials were used (acrylonitr…
View article: Tensile behavior of individual fibers and films made via material extrusion additive manufacturing
Tensile behavior of individual fibers and films made via material extrusion additive manufacturing Open
The mechanical behavior of thermoplastic materials processed via material extrusion additive manufacturing (MEAM) is a topic of great interest in several disciplines. Most of the material behavior characterization that has been done on the…
View article: Effect of Channel Roughness on Micro-Droplet Distribution in Internal Minimum Quantity Lubrication
Effect of Channel Roughness on Micro-Droplet Distribution in Internal Minimum Quantity Lubrication Open
This research studied the effect of channel roughness on micro-droplet distributions in internal minimum quantity lubrication for effective machining. Mixtures of different oils and air were flown though internal channels with simulated di…
View article: Comparative property analysis of fused filament fabrication PLA using fresh and recycled feedstocks
Comparative property analysis of fused filament fabrication PLA using fresh and recycled feedstocks Open
Manufacturing industries generate much waste, which can be converted into raw materials for other allied industries. Thermoplastic wastes can be recycled in many cases. Recently these recycled plastics have been used to manufacture the inp…
View article: Extending the Operating Life of Thermoplastic Components via On-Demand Patching and Repair Using Fused Filament Fabrication
Extending the Operating Life of Thermoplastic Components via On-Demand Patching and Repair Using Fused Filament Fabrication Open
Polymer-based engineering materials (plastics, polymer matrix composites, and similar) are becoming more widely used for the design and construction of consumer products and systems. While providing a host of design benefits, these materia…
View article: Identification and Mapping of Manufacturability Constraints for Extrusion-Based Additive Manufacturing
Identification and Mapping of Manufacturability Constraints for Extrusion-Based Additive Manufacturing Open
This article develops and demonstrates a set of design-focused manufacturability constraints for the fused deposition modeling/fused filament fabrication (FDM/FFF) process. These can be mapped from the basic behavior and process characteri…
View article: Buckling Strength of 3-D Printed Thermoplastic Thin Shells: Notes on an Exploratory Study of As-Printed and Reinforced Cases
Buckling Strength of 3-D Printed Thermoplastic Thin Shells: Notes on an Exploratory Study of As-Printed and Reinforced Cases Open
Additively-manufactured (AM) materials have a defined mesostructure and natural voids which impact their structural stability; thin shells, which do not have the bulk to support or absorb the effects of the variances in properties, are par…
View article: Buckling strength of additively manufactured cylindrical shells: An exploratory study of as-printed and reinforced ABS and PLA cases
Buckling strength of additively manufactured cylindrical shells: An exploratory study of as-printed and reinforced ABS and PLA cases Open
Additively-manufactured (AM) materials have a defined mesostructure and natural voids which impact their structural stability; thin shells which so not have bulk to support or absorb the effects of the variances in properties are particula…
View article: 3-D printing as a STEAM tool for bridging artistic and technical design perspectives
3-D printing as a STEAM tool for bridging artistic and technical design perspectives Open
In this reflection, we discuss some thoughts on the usefulness of 3-D printing as a tool for bridging the different perspectives on product design offered by both artistic and technical approaches. This bridging could be very useful, as it…
View article: System-Level Testing and Evaluation Plan for Field Robots: A Tutorial with Test Course Layouts
System-Level Testing and Evaluation Plan for Field Robots: A Tutorial with Test Course Layouts Open
Field robotics is a very important sub-field of robotic systems, focusing on systems which need to navigate in open, unpredictable terrain and perform non-repetitive missions while monitoring and reacting to their surroundings. General tes…
View article: Development of User-Integrated Semi-Autonomous Lawn Mowing Systems: A Systems Engineering Perspective and Proposed Architecture
Development of User-Integrated Semi-Autonomous Lawn Mowing Systems: A Systems Engineering Perspective and Proposed Architecture Open
This concept paper outlines a conceptual framework for the design and development of user-integrated semi-autonomous lawn mowing systems. This is approached from a systems engineering perspective, considering both hardware and software ele…
View article: Critical Buckling Load of Thin-Walled Plastic Cylinders in Axial and Radial Loading: Overview and FEA Case Study
Critical Buckling Load of Thin-Walled Plastic Cylinders in Axial and Radial Loading: Overview and FEA Case Study Open
This technical note discusses the theoretical static buckling load of thin-walled plastic cylinders under axial and radial loading. While the buckling of thin-walled cylinders is a well-researched topic, a variety of new design and manufac…