Cox, Nicholas
(2018)
Modeling Shape Distortion of 3-D Printed Aluminum Oxide Parts During Sintering.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Ceramic parts have become increasingly valuable in many different engineering applications due
to their high melting point and other desirable mechanical properties. When manufacturing
ceramic parts with complicated geometries, 3-D printing has become a very useful production
method. When creating 3-D printed ceramic parts, producing the desired properties are based on
achieving the proper microstructure. After printing, the density of the part is low and the resulting
microstructure is inadequate for many engineering applications. To increase the density of the part,
and create the desired mechanical properties the part must be heat treated. This process is known
as sintering. Sintering entails heating a part, which has already been formed, so that densification
occurs [1]. During the sintering process, distortion and non-uniform densification occurs. This is
a result of non-uniform pore distribution throughout the material resulting in inhomogeneous
material density. Friction upon shrinkage and gravity also play roles in the non-uniform sintering
[2]. The prediction of non-uniform densification and distortion of the manufactured part is
essential to efficiently manufacture ceramic parts to a predetermined dimension. The objective of
this thesis is to generate techniques for modeling 3-D printed ceramics (Aluminum Oxide) during
the sintering process to accurately predict shrinkage and distortion. A continuum mechanics
approach was taken to create a constitutive model that describes the relationship between the stress
and strain tensor during the sintering process. The constitutive model was utilized in creating a
user subroutine (UMAT) to implement into the FEA program, Abaqus.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
11 June 2018 |
| Date Type: |
Publication |
| Defense Date: |
10 January 2018 |
| Approval Date: |
11 June 2018 |
| Submission Date: |
3 March 2018 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
79 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering and Materials Science |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Sintering Simulation
Ceramic Sintering
Constitutive Model
Sintering Simulation |
| Date Deposited: |
11 Jun 2018 18:30 |
| Last Modified: |
11 Jun 2018 18:30 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/33854 |
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