Residual stress characterization of shot peening using x-ray diffraction and eddy current testing
In shot peening, design engineers typically provide the desired peening intensity or desired residual stress value for the peening engineers to achieve. As there are no established relationships between peening intensity, residual stresses and the various material characteristics, they rely on empir...
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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/74535 |
| _version_ | 1811677983186878464 |
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| author | Mir Akbarkhan Mohammad Feroskhan |
| author2 | Pang Hock Lye, John |
| author_facet | Pang Hock Lye, John Mir Akbarkhan Mohammad Feroskhan |
| author_sort | Mir Akbarkhan Mohammad Feroskhan |
| collection | NTU |
| description | In shot peening, design engineers typically provide the desired peening intensity or desired residual stress value for the peening engineers to achieve. As there are no established relationships between peening intensity, residual stresses and the various material characteristics, they rely on empirical methods such as Almen Strip and experiences and guesses from past peening processes. This casts doubt on the validity of the shot peening process. Moreover, the inefficiencies of the current state of the art residual stress measurement methods motivates this study to combine the X-Ray Diffraction technique and the Eddy Current Testing method as a novel residual stress measurement method. This paper deals with nickel superalloys namely IN718 & IN625. The nickel specimens are shot peened at various intensities and subsequently, its conductivity measured by the Eddy Current Testing method. X-Ray Diffraction were also done to investigate the peening intensity vs residual stress relationship and to characterize the whole shot peening process. Eddy Current results indicated that the probe was not suitable due to its low frequency, hence going beyond the shot peening compressive residual stress layers. Thus, the Eddy Current method was unsuccessful. Subsequently, probe designs are suggested and the possibility of data conversion of electrical conductivity to residual stress demonstrated. X-Ray Diffraction results showed that the stress and cold work readings were not sufficient to ascertain the relationship mathematically and coupled with anomalous roughness data, it is not enough to tell if a shot peening process is done correctly. For now, only a crude relationship can be established for the peening intensity, residual stresses and the various material characteristics of the shot peening process. |
| first_indexed | 2024-10-01T02:46:02Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/74535 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:46:02Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/745352023-03-04T19:02:42Z Residual stress characterization of shot peening using x-ray diffraction and eddy current testing Mir Akbarkhan Mohammad Feroskhan Pang Hock Lye, John School of Mechanical and Aerospace Engineering A*STAR Advanced Remanufacturing and Technology Centre DRNTU::Engineering::Materials::Material testing and characterization In shot peening, design engineers typically provide the desired peening intensity or desired residual stress value for the peening engineers to achieve. As there are no established relationships between peening intensity, residual stresses and the various material characteristics, they rely on empirical methods such as Almen Strip and experiences and guesses from past peening processes. This casts doubt on the validity of the shot peening process. Moreover, the inefficiencies of the current state of the art residual stress measurement methods motivates this study to combine the X-Ray Diffraction technique and the Eddy Current Testing method as a novel residual stress measurement method. This paper deals with nickel superalloys namely IN718 & IN625. The nickel specimens are shot peened at various intensities and subsequently, its conductivity measured by the Eddy Current Testing method. X-Ray Diffraction were also done to investigate the peening intensity vs residual stress relationship and to characterize the whole shot peening process. Eddy Current results indicated that the probe was not suitable due to its low frequency, hence going beyond the shot peening compressive residual stress layers. Thus, the Eddy Current method was unsuccessful. Subsequently, probe designs are suggested and the possibility of data conversion of electrical conductivity to residual stress demonstrated. X-Ray Diffraction results showed that the stress and cold work readings were not sufficient to ascertain the relationship mathematically and coupled with anomalous roughness data, it is not enough to tell if a shot peening process is done correctly. For now, only a crude relationship can be established for the peening intensity, residual stresses and the various material characteristics of the shot peening process. Bachelor of Engineering (Mechanical Engineering) 2018-05-21T05:56:42Z 2018-05-21T05:56:42Z 2018 Final Year Project (FYP) http://hdl.handle.net/10356/74535 en Nanyang Technological University 73 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials::Material testing and characterization Mir Akbarkhan Mohammad Feroskhan Residual stress characterization of shot peening using x-ray diffraction and eddy current testing |
| title | Residual stress characterization of shot peening using x-ray diffraction and eddy current testing |
| title_full | Residual stress characterization of shot peening using x-ray diffraction and eddy current testing |
| title_fullStr | Residual stress characterization of shot peening using x-ray diffraction and eddy current testing |
| title_full_unstemmed | Residual stress characterization of shot peening using x-ray diffraction and eddy current testing |
| title_short | Residual stress characterization of shot peening using x-ray diffraction and eddy current testing |
| title_sort | residual stress characterization of shot peening using x ray diffraction and eddy current testing |
| topic | DRNTU::Engineering::Materials::Material testing and characterization |
| url | http://hdl.handle.net/10356/74535 |
| work_keys_str_mv | AT mirakbarkhanmohammadferoskhan residualstresscharacterizationofshotpeeningusingxraydiffractionandeddycurrenttesting |