Fatigue life testing and analysis of remanufactured components

High strength steels such as AISI 4340 are extensively used in many industrial applications such as building and construction, automobiles and aircraft applications. However, like other steels, 4340 steels are highly susceptible to fatigue failure. Therefore, the fatigue analysis of 4340 steels is...

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Main Author: Dinesh s/o Cheram
Other Authors: Zou Jianping
Format: Final Year Project
Language:English
Published: 2014
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Online Access:http://hdl.handle.net/10356/60443
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-604432023-03-04T19:07:32Z Fatigue life testing and analysis of remanufactured components Dinesh s/o Cheram Zou Jianping School of Mechanical and Aerospace Engineering Zhou Kun DRNTU::Engineering::Materials::Testing of materials High strength steels such as AISI 4340 are extensively used in many industrial applications such as building and construction, automobiles and aircraft applications. However, like other steels, 4340 steels are highly susceptible to fatigue failure. Therefore, the fatigue analysis of 4340 steels is crucial due to its extensive and rapidly increasing usage in industrial applications. In addition, there is a need for remanufacture engineering as the replacement of 4340 steel components is costly and impractical. In this project, un-notched and notched 4340 steel specimens are fatigue tested under various stress ranges to deduce the lifespan of 4340 steels and the S-N curves are plotted. The fatigue crack growth rates of notched 4340 steels are also studied extensively by various techniques such as Scanning Electron Microscopy (SEM) and Digital Imaging Correlation (DIC). The Paris law constants m and C are empirically derived from results obtained from fatigue crack growth rates and the stress intensity factor ahead of the crack tip. In the final experiment, laser cladded 4340 steels which simulate remanufactured components are fatigue tested. Subsequently, microstructural evaluation on the fractured surface of laser cladded 4340 steels are conducted by SEM analysis to identify fatigue initiation sites and fatigue failure mechanisms. Bachelor of Engineering (Mechanical Engineering) 2014-05-27T06:17:59Z 2014-05-27T06:17:59Z 2014 2014 Final Year Project (FYP) http://hdl.handle.net/10356/60443 en Nanyang Technological University 70 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Materials::Testing of materials
spellingShingle DRNTU::Engineering::Materials::Testing of materials
Dinesh s/o Cheram
Fatigue life testing and analysis of remanufactured components
description High strength steels such as AISI 4340 are extensively used in many industrial applications such as building and construction, automobiles and aircraft applications. However, like other steels, 4340 steels are highly susceptible to fatigue failure. Therefore, the fatigue analysis of 4340 steels is crucial due to its extensive and rapidly increasing usage in industrial applications. In addition, there is a need for remanufacture engineering as the replacement of 4340 steel components is costly and impractical. In this project, un-notched and notched 4340 steel specimens are fatigue tested under various stress ranges to deduce the lifespan of 4340 steels and the S-N curves are plotted. The fatigue crack growth rates of notched 4340 steels are also studied extensively by various techniques such as Scanning Electron Microscopy (SEM) and Digital Imaging Correlation (DIC). The Paris law constants m and C are empirically derived from results obtained from fatigue crack growth rates and the stress intensity factor ahead of the crack tip. In the final experiment, laser cladded 4340 steels which simulate remanufactured components are fatigue tested. Subsequently, microstructural evaluation on the fractured surface of laser cladded 4340 steels are conducted by SEM analysis to identify fatigue initiation sites and fatigue failure mechanisms.
author2 Zou Jianping
author_facet Zou Jianping
Dinesh s/o Cheram
format Final Year Project
author Dinesh s/o Cheram
author_sort Dinesh s/o Cheram
title Fatigue life testing and analysis of remanufactured components
title_short Fatigue life testing and analysis of remanufactured components
title_full Fatigue life testing and analysis of remanufactured components
title_fullStr Fatigue life testing and analysis of remanufactured components
title_full_unstemmed Fatigue life testing and analysis of remanufactured components
title_sort fatigue life testing and analysis of remanufactured components
publishDate 2014
url http://hdl.handle.net/10356/60443
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