scholarly journals High Performance Polymers in Additive Manufacturing Processes: Understanding Process, Structure and Property

2015 ◽  
Vol 21 (S3) ◽  
pp. 127-128 ◽  
Author(s):  
Manuel Garcia-Leiner ◽  
Daniel P. Dennies ◽  
Atif Yardimci
Keyword(s):  
Additive Manufacturing ◽  
High Performance ◽  
Manufacturing Processes ◽  
Structure And Property ◽  
High Performance Polymers ◽  
Process Structure

scholarly journals Numerical prediction of process-dependent properties of high-performance Ti6Al4 in LS-DYNA

2021 ◽  
Author(s):  
Johannes Buhl ◽  
Thomas Klöppel ◽  
Mathias Merten ◽  
Andre Haufe ◽  
Israr Rameez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
High Performance ◽  
Evolution Equations ◽  
Material Model ◽  
Structure Evolution ◽  
Internal Variables ◽  
Manufacturing Processes ◽  
Workpiece Material ◽  
Microstructural Parameters

In modern manufacturing processes such as hot forming or additive manufacturing, the workpiece material undergoes very complex thermomechanical load cycles. The local mechanical properties in the component are process-dependent and the result of the different micro-structure evolution mechanisms in the material. Numerical process simulation tools aim to include more and more of these mechanisms in order to improve the accuracy of the simulations. The mechanical strength of high-performance materials such as Ti-6Al-4V depends on microstructural parameters, which are influenced by the temperature and strain histories. This contribution puts forward an implementation of a new generalized internal variables material model *MAT_GENERALIZED_PHASECHANGE in LS-DYNA. The evolution of internal variables such as phase fractions, grain size and dislocation densities can be predicted by evolution equations, and combined with yield stress models taking the contribution of the phases, grain sizes (Hall-Petch effect), and the dislocation density into account to predict the resulting mechanical properties of the processed material. The benefits of the implementation in the commercial software LS-DYNA is the possibility to solve complex coupled problems. For example, the new material law can be used to simulate hybrid manufacturing processes like forging and an additional additive manufacturing process, where changes in microstructure are highly coupled and important for the part properties.

Using Rapid Manufacturability Analysis Tools to Enhance Design-for-Manufacturing Training in Engineering Education

2016 ◽  
Author(s):  
Roby Lynn ◽  
Kathryn Jablokow ◽  
Nithin Reddy ◽  
Christopher Saldana ◽  
Tommy Tucker ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Software Package ◽  
High Performance ◽  
Engineering Students ◽  
Design For Manufacturability ◽  
Manufacturing Processes ◽  
Analysis Tool ◽  
Planning Software ◽  
Subtractive Manufacturing ◽  
Performance Computing

Engineering students are often unaware of manufacturing challenges introduced during the design process. Students tend to design parts that are either very difficult or impossible to manufacture because they are unaware of the intricacies and limitations of the manufacturing processes available. Design for manufacturability (DFM) education must be improved to help address this issue. This work discusses a vision for the implementation of a rapid method for facilitating DFM education in terms of subtractive and additive manufacturing processes. The goal is to teach students about how their designs impact the ease and cost of manufacturing, in addition to giving them knowledge and confidence to move fluidly between additive and subtractive manufacturing mindsets. For subtractive manufacturing, this is accomplished through a high-performance-computing accelerated and parallelized trajectory planning software package that enables students to visualize the subtractive manufacturability of the parts they design as rapidly as they get feedback when using additive manufacturing processes. Implementation of the subtractive manufacturability analysis tool in a sophomore-level design class is presented, along with the assessment of the students’ conceptual manufacturing-related understanding.

Substituting Die-Cast Products by Injection Molded High Performance Polymers

2016 ◽  
Vol 699 ◽  
pp. 91-96
Author(s):  
Donatella Gagliardi ◽  
Fabrizio Quadrini ◽  
Loredana Santo
Keyword(s):  
High Performance ◽  
Manufacturing Processes ◽  
High Performance Polymers ◽  
Die Cast ◽  
Injection Molded ◽  
Process Energy ◽  
Manufacturing Time ◽  
Domestic Appliances ◽  
Cast Products

High performance polymers (HPP) represent a wide class of materials which is used in all the engineering sectors from automotive to domestic appliances. Thanks to their high mechanical and functional properties HPPs, have substituted metals in many applications with the result of reducing manufacturing time and costs. In such cases, this substitution also results in an improvement of part performances as in the case of tribological applications, despite of the strong sensibility of tribological polymers to manufacturing processes. However, supplying costs of high performance polymers is continuously increasing in the last years and the cheapness of this substitution is always under discussion. In this work, a comparison is made between injection moulding of glass filled polyamide and aluminum die casting in terms of process energy and production cost. The production of a motorcycle lever has been considered as case-study. The plastic lever has been also prototyped by machining to show its correct functionality.

Two-stage self-seeding method for preparation of single crystals of poly(phenylene sulfide)

1989 ◽  
Vol 47 ◽  
pp. 368-369
Author(s):  
Sengshiu Chung ◽  
Peggy Cebe
Keyword(s):  
Single Crystals ◽  
High Performance ◽  
Dilute Solution ◽  
Two Stage ◽  
Annealing Behavior ◽  
High Performance Polymers ◽  
Seeding Method ◽  
Phenylene Sulfide

We are studying the crystallization and annealing behavior of high performance polymers, like poly(p-pheny1ene sulfide) PPS, and poly-(etheretherketone), PEEK. Our purpose is to determine whether PPS, which is similar in many ways to PEEK, undergoes reorganization during annealing. In an effort to address the issue of reorganization, we are studying solution grown single crystals of PPS as model materials.Observation of solution grown PPS crystals has been reported. Even from dilute solution, embrionic spherulites and aggregates were formed. We observe that these morphologies result when solutions containing uncrystallized polymer are cooled. To obtain samples of uniform single crystals, we have used two-stage self seeding and solution replacement techniques.

CHEMICAL CONVERSION OF 2.4.6-TRINITROTOLUENE (TNT) TO NEW HIGH PERFORMANCE POLYMERS

2002 ◽  
Vol 5 (1-6) ◽  
pp. 1031-1047
Author(s):  
A. L. Rusanov ◽  
L. G. Komarova ◽  
M. P. Prigozhina ◽  
V. A. Tartakovsky ◽  
S. A. Shevelev ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Conversion ◽  
High Performance Polymers

scholarly journals Additive Manufacturing Under Lunar Gravity and Microgravity

2021 ◽  
Vol 33 (2) ◽  
Author(s):  
B. Reitz ◽  
C. Lotz ◽  
N. Gerdes ◽  
S. Linke ◽  
E. Olsen ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Spare Parts ◽  
Manufacturing Processes ◽  
Complex Structures ◽  
Lunar Gravity ◽  
Limited Extent ◽  
Test Environment ◽  
Manufacturing Tests ◽  
Laser Experiments ◽  
Materials Used

AbstractMankind is setting to colonize space, for which the manufacturing of habitats, tools, spare parts and other infrastructure is required. Commercial manufacturing processes are already well engineered under standard conditions on Earth, which means under Earth’s gravity and atmosphere. Based on the literature review, additive manufacturing under lunar and other space gravitational conditions have only been researched to a very limited extent. Especially, additive manufacturing offers many advantages, as it can produce complex structures while saving resources. The materials used do not have to be taken along on the mission, they can even be mined and processed on-site. The Einstein-Elevator offers a unique test environment for experiments under different gravitational conditions. Laser experiments on selectively melting regolith simulant are successfully conducted under lunar gravity and microgravity. The created samples are characterized in terms of their geometry, mass and porosity. These experiments are the first additive manufacturing tests under lunar gravity worldwide.

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