Investigation of high-cycle fatigue properties of 3D-printed steel parts

Manufacturing technology has made significant improvement over the years and additive manufacturing (AM) technology, also known as three-dimension (3D) printing, specifically Laser Engineered Net Shaping (LENS), is becoming more popular in many industries. In the marine industry, High Strength Low A...

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Main Author: Chow, Jian Xiong
Other Authors: Liu Erjia
Format: Final Year Project
Language:English
Published: 2018
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Online Access:http://hdl.handle.net/10356/75809
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-758092023-03-04T19:32:33Z Investigation of high-cycle fatigue properties of 3D-printed steel parts Chow, Jian Xiong Liu Erjia School of Mechanical and Aerospace Engineering Tan Xipeng DRNTU::Engineering::Mechanical engineering Manufacturing technology has made significant improvement over the years and additive manufacturing (AM) technology, also known as three-dimension (3D) printing, specifically Laser Engineered Net Shaping (LENS), is becoming more popular in many industries. In the marine industry, High Strength Low Alloy (HSLA) ASTM A131 steel is one of the most widely used materials in the marine structures due to its excellent mechanical properties. Although LENS processes can optimize the usage of materials and has the ability to produce complex parts, the inherent process-related defects such as pores and voids will cause mechanical inferiorities. Therefore, this project aims to investigate the fatigue behaviour of A131 steel specimens fabricated by a LENS process. As-built A131 steel samples in four different orientations (XY-0°, XY-45°, XZ-45° and XZ-90°) were subjected to tensile and fatigue tests. In the tensile tests, most of the specimens passed the ASTM standard except XZ-45° specimens. In the fatigue testing, all the specimens were subjected to a constant amplitude uniaxial fully reversed fatigue loading. The fatigue results were plotted in the S-N curve. Fractographic analyses also conducted using Scanning Electron Microscope (SEM). In general, the fatigue life of the as-built LENS A131 steel specimens of different orientations was in the high-cycle regime. The fatigue failure was mainly attributed to the LENS process induced defects such as pores and lack of fusion. Most of the specimens showed the obvious stages of crack initiation, propagation and final failure. Bachelor of Engineering (Mechanical Engineering) 2018-06-18T05:03:10Z 2018-06-18T05:03:10Z 2018 Final Year Project (FYP) http://hdl.handle.net/10356/75809 en Nanyang Technological University 67 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::Mechanical engineering
spellingShingle DRNTU::Engineering::Mechanical engineering
Chow, Jian Xiong
Investigation of high-cycle fatigue properties of 3D-printed steel parts
description Manufacturing technology has made significant improvement over the years and additive manufacturing (AM) technology, also known as three-dimension (3D) printing, specifically Laser Engineered Net Shaping (LENS), is becoming more popular in many industries. In the marine industry, High Strength Low Alloy (HSLA) ASTM A131 steel is one of the most widely used materials in the marine structures due to its excellent mechanical properties. Although LENS processes can optimize the usage of materials and has the ability to produce complex parts, the inherent process-related defects such as pores and voids will cause mechanical inferiorities. Therefore, this project aims to investigate the fatigue behaviour of A131 steel specimens fabricated by a LENS process. As-built A131 steel samples in four different orientations (XY-0°, XY-45°, XZ-45° and XZ-90°) were subjected to tensile and fatigue tests. In the tensile tests, most of the specimens passed the ASTM standard except XZ-45° specimens. In the fatigue testing, all the specimens were subjected to a constant amplitude uniaxial fully reversed fatigue loading. The fatigue results were plotted in the S-N curve. Fractographic analyses also conducted using Scanning Electron Microscope (SEM). In general, the fatigue life of the as-built LENS A131 steel specimens of different orientations was in the high-cycle regime. The fatigue failure was mainly attributed to the LENS process induced defects such as pores and lack of fusion. Most of the specimens showed the obvious stages of crack initiation, propagation and final failure.
author2 Liu Erjia
author_facet Liu Erjia
Chow, Jian Xiong
format Final Year Project
author Chow, Jian Xiong
author_sort Chow, Jian Xiong
title Investigation of high-cycle fatigue properties of 3D-printed steel parts
title_short Investigation of high-cycle fatigue properties of 3D-printed steel parts
title_full Investigation of high-cycle fatigue properties of 3D-printed steel parts
title_fullStr Investigation of high-cycle fatigue properties of 3D-printed steel parts
title_full_unstemmed Investigation of high-cycle fatigue properties of 3D-printed steel parts
title_sort investigation of high-cycle fatigue properties of 3d-printed steel parts
publishDate 2018
url http://hdl.handle.net/10356/75809
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