E-Thesis 82 views
Novel Test Techniques to Characterise the Mechanical Performance of Additive Manufactured (AM) Aerospace Alloys / Ben Haigh
Swansea University Author: Ben Haigh
DOI (Published version): 10.23889/SUthesis.65831
Abstract
With the continuous evolution of the aerospace industry, there is a strong desire to fabricate more intricate components in the modern jet engine that exhibit less stress-raising features to enable higher engine efficiencies to be achieved. To achieve this goal, aerospace engineers are looking at ad...
| Published: |
Swansea, Wales, UK
2024
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| Institution: | Swansea University |
| Degree level: | Doctoral |
| Degree name: | Ph.D |
| Supervisor: | Lancaster, Robert J. |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa65831 |
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| Abstract: |
With the continuous evolution of the aerospace industry, there is a strong desire to fabricate more intricate components in the modern jet engine that exhibit less stress-raising features to enable higher engine efficiencies to be achieved. To achieve this goal, aerospace engineers are looking at additive manufacturing (AM) as a potential solution since AM provides a manufacturing technique that uses less raw material in the form of a powder, saving material which in turn reduces the cost of the process. One of the major limitations of AM is the resulting transient nature of the microstructure typically produced by the process, and it is difficult to fabricate representative laboratory scale mechanical test specimens that closely replicate the microstructure of the finished component. Therefore, it can be beneficial to utilise more novel small-scale test methods, such as the small punch (SP) test and shear punch (ShP) test, which can obtain mechanical property information from miniaturised specimens extracted directly from the finished part. In this research programme, correlations have been made between standard conventional testing techniques and the novel small-scale methods to investigate the suitability of using such methods in characterising the mechanical properties of laser powder bed fused (LPBF) aerospace materials, namely the nickel based polycrystalline superalloy, Inconel 718, and the titanium alloy, Ti-6Al-4V specimens. Furthermore, effort will be directed towards identifying whether small scale test methods can effectively establish whether the mechanical response of additively manufactured components vary within a single build, or likewise, across different builds, which could provide a key insight for design engineers both now and in the future. |
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| Keywords: |
Additive Manufacturing, Small Punch Testing |
| College: |
Faculty of Science and Engineering |
| Funders: |
EPSRC doctoral training grant |