10 research outputs found
Recommended from our members
Binder Jetting Additive Manufacturing of Water-Atomized Iron
Binder jetting additive manufacturing (BJAM) was deployed to processing of low-cost, water-atomized
pure iron powder. Surface morphology and particle size distribution of the powder were fully characterized
using scanning electron microscopy (SEM) and particle dynamic image analysis via Retsch Camsizer X2.
Cylindrical samples were fabricated, and in the AM process, the effects of powder compaction, layer
thickness and liquid binder level on green part density were studied. Density analysis was performed
using x-ray computed tomography (µCT). The potential application and future research work will be
outlined based on the characterization results.Mechanical Engineerin
Geometrical Degrees of Freedom for Cellular Structures Generation: A New Classification Paradigm
Cellular structures (CSs) have been used extensively in recent years, as they offer a unique range of design freedoms. They can be deployed to create parts that can be lightweight by introducing controlled porous features, while still retaining or improving their mechanical, thermal, or even vibrational properties. Recent advancements in additive manufacturing (AM) technologies have helped to increase the feasibility and adoption of cellular structures. The layer-by-layer manufacturing approach offered by AM is ideal for fabricating CSs, with the cost of such parts being largely independent of complexity. There is a growing body of literature concerning CSs made via AM; this presents an opportunity to review the state-of-the-art in this domain and to showcase opportunities in design and manufacturing. This review will propose a novel way of classifying cellular structures by isolating their Geometrical Degrees of Freedom (GDoFs) and will explore the recent innovations in additively manufactured CSs. Based on the present work, the design inputs that are common in CSs generation will be highlighted. Furthermore, the work explores examples of how design inputs have been used to drive the design domain through various case studies. Finally, the review will highlight the manufacturability limitations of CSs in AM
Recommended from our members
Design, Developments, and Results from the NIST Additive Manufacturing Metrology Testbed (AMMT)
The National Institute of Standards and Technology (NIST) is developing a facility titled
the Additive Manufacturing Metrology Testbed that will enable advanced research into
monitoring, controls, process development, and temperature measurement for laser powder bed
fusion additive manufacturing and similar processes. This system provides an open control
architecture as well as a plethora of sensor systems and calibration sources that are primarily
radiance-based and aligned co-axially with the laser beam and focused on the laser interaction
zone. This paper briefly reviews the system requirements, and details the current progress of the
facility design and construction. Mechanical, optical, and control systems designs are detailed
with select highlights that may be relevant to additive manufacturing researchers and system
developers. Recent experimental results from the prototype laser control and in-situ monitoring
system are also highlighted.Mechanical Engineerin