scholarly journals Harnessing irreversible thermal strain for shape memory in polymer additive manufacturing

2019 ◽  
Vol 136 (47) ◽  
pp. 48239 ◽  
Author(s):  
Tone P. D'Amico ◽  
Connor Barrett ◽  
Joseph Presing ◽  
Roshni Patnayakuni ◽  
Masoumeh Pourali ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Shape Memory ◽  
Thermal Strain ◽  
Polymer Additive

scholarly journals Design of Shape Memory Thermoplastic Material Systems for FDM-Type Additive Manufacturing

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4254
Author(s):  
Paulina A. Quiñonez ◽  
Leticia Ugarte-Sanchez ◽  
Diego Bermudez ◽  
Paulina Chinolla ◽  
Rhyan Dueck ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Shape Memory ◽  
Thermomechanical Processing ◽  
Material Selection ◽  
Shape Memory Polymer ◽  
Fused Filament Fabrication ◽  
Materials Development ◽  
Thermoplastic Material ◽  
Polymer Systems ◽  
Injection Molded

The work presented here describes a paradigm for the design of materials for additive manufacturing platforms based on taking advantage of unique physical properties imparted upon the material by the fabrication process. We sought to further investigate past work with binary shape memory polymer blends, which indicated that phase texturization caused by the fused filament fabrication (FFF) process enhanced shape memory properties. In this work, two multi-constituent shape memory polymer systems were developed where the miscibility parameter was the guide in material selection. A comparison with injection molded specimens was also carried out to further investigate the ability of the FFF process to enable enhanced shape memory characteristics as compared to other manufacturing methods. It was found that blend combinations with more closely matching miscibility parameters were more apt at yielding reliable shape memory polymer systems. However, when miscibility parameters differed, a pathway towards the creation of shape memory polymer systems capable of maintaining more than one temporary shape at a time was potentially realized. Additional aspects related to impact modifying of rigid thermoplastics as well as thermomechanical processing on induced crystallinity are also explored. Overall, this work serves as another example in the advancement of additive manufacturing via materials development.

scholarly journals Process–Structure–Properties in Polymer Additive Manufacturing

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1098
Author(s):  
Swee Leong Sing ◽  
Wai Yee Yeong
Keyword(s):  
Additive Manufacturing ◽  
Polymer Additive ◽  
Process Structure ◽  
Structure Properties

Additive manufacturing (AM) methods have grown and evolved rapidly in recent years [...]

The electron beam freeform fabrication of NiTi shape memory alloys. Part I: Microstructure and physical–chemical behavior

2020 ◽  
pp. 146442072097505
Author(s):  
RPM Guimarães ◽  
F Pixner ◽  
G Trimmel ◽  
J Hobisch ◽  
T Rath ◽  
...  
Keyword(s):  
Electron Beam ◽  
Additive Manufacturing ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Nickel Titanium ◽  
Freeform Fabrication ◽  
Austenitic Transformation ◽  
Columnar Grains ◽  
One Step ◽  
Niti Shape Memory Alloys

Nickel–titanium alloys are the most widely used shape memory alloys due to their outstanding shape memory effect and superelasticity. Additive manufacturing has recently emerged in the fabrication of shape memory alloy but despite substantial advances in powder-based techniques, less attention has been focused on wire-based additive manufacturing. This work reports on the preliminary results for the process-related microstructural and phase transformation changes of Ni-rich nickel–titanium alloy additively manufactured by wire-based electron beam freeform fabrication. To study the feasibility of the process, a simple 10-layer stack structure was successfully built and characterized, exhibiting columnar grains and achieving one-step reversible martensitic–austenitic transformation, thus showing the potential of this additive manufacturing technique for processing shape memory alloys.

Additive Manufacturing of Shape Memory Polymer Composites for Futuristic Technology

2021 ◽  
Author(s):  
Jigar Patadiya ◽  
Adwait Gawande ◽  
Ganapati Joshi ◽  
Balasubramanian Kandasubramanian
Keyword(s):  
Additive Manufacturing ◽  
Shape Memory ◽  
Polymer Composites ◽  
Shape Memory Polymer

Alternate Method for Determining Yield Strength of Polymer Additive Manufacturing

2020 ◽  
pp. 214-228
Author(s):  
Chul Y. Park ◽  
Keith E. Rupel ◽  
Chelsey E. Henry ◽  
Kevin F. Malik ◽  
Sayata Ghose ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Yield Strength ◽  
Polymer Additive
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