High–accuracy measurement of through–thickness residual stress at welds through deep hole drilling technique
This paper presents a method to improve accuracy of measuring through–thickness residual stress for welds through deep hole drilling (DHD) technique. The focus of this study is the effect of dimensions of the hollow cylinder, which is manufactured by drilling and trepanning processes, on residual st...
| Main Authors: | , |
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| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2023-04-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/89/920/89_22-00288/_pdf/-char/en |
| _version_ | 1797817454090518528 |
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| author | Masahito MOCHIZUKI Shigetaka OKANO |
| author_facet | Masahito MOCHIZUKI Shigetaka OKANO |
| author_sort | Masahito MOCHIZUKI |
| collection | DOAJ |
| description | This paper presents a method to improve accuracy of measuring through–thickness residual stress for welds through deep hole drilling (DHD) technique. The focus of this study is the effect of dimensions of the hollow cylinder, which is manufactured by drilling and trepanning processes, on residual stress measurement at the welds. First, stress concentration–induced plastic region around a reference (drilled) hole was theoretically quantified according to value of existing stress. The plastic region around the hole is not negligible for the welds at where high tensile residual stress exists. In order to reduce the influence of the plastic region, it is considered effective to set a large ratio of trepanning diameter to drilling diameter. Another noteworthy thing is that weld residual stress is present in a relatively narrow region along a weld line. Then, DHD technique was applied to measure through–thickness residual stress at the welds of melt–run welded–plate specimens under conditions of various drilling and trepanning diameters. These DHD residual stress measurement results were compared with those measured by X–ray diffraction and contour methods and calculated by weld thermal elastic–plastic analysis. As the results, it was shown that through–thickness residual stresses measured by DHD technique were obviously influenced by dimensions of the hollow cylinder. Measurement accuracy becomes higher with increasing the ratio of trepanning diameter to drilling diameter. Meanwhile, trepanning diameter should not be larger than width of generation area of high tensile residual stress to be measured at the welds. It was concluded that a method for determining appropriate dimensions of the hollow cylinder to be drilled and trepanned was successfully proposed to accurately assess through–thickness residual stress at the welds through DHD technique. |
| first_indexed | 2024-03-13T08:53:40Z |
| format | Article |
| id | doaj.art-c37ecd376f354356be589a2ff7d78325 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-03-13T08:53:40Z |
| publishDate | 2023-04-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-c37ecd376f354356be589a2ff7d783252023-05-29T07:32:54ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612023-04-018992022-0028822-0028810.1299/transjsme.22-00288transjsmeHigh–accuracy measurement of through–thickness residual stress at welds through deep hole drilling techniqueMasahito MOCHIZUKI0Shigetaka OKANO1Osaka Univ. Dept. of Materials and Manufacturing ScienceOsaka Univ. Dept. of Materials and Manufacturing ScienceThis paper presents a method to improve accuracy of measuring through–thickness residual stress for welds through deep hole drilling (DHD) technique. The focus of this study is the effect of dimensions of the hollow cylinder, which is manufactured by drilling and trepanning processes, on residual stress measurement at the welds. First, stress concentration–induced plastic region around a reference (drilled) hole was theoretically quantified according to value of existing stress. The plastic region around the hole is not negligible for the welds at where high tensile residual stress exists. In order to reduce the influence of the plastic region, it is considered effective to set a large ratio of trepanning diameter to drilling diameter. Another noteworthy thing is that weld residual stress is present in a relatively narrow region along a weld line. Then, DHD technique was applied to measure through–thickness residual stress at the welds of melt–run welded–plate specimens under conditions of various drilling and trepanning diameters. These DHD residual stress measurement results were compared with those measured by X–ray diffraction and contour methods and calculated by weld thermal elastic–plastic analysis. As the results, it was shown that through–thickness residual stresses measured by DHD technique were obviously influenced by dimensions of the hollow cylinder. Measurement accuracy becomes higher with increasing the ratio of trepanning diameter to drilling diameter. Meanwhile, trepanning diameter should not be larger than width of generation area of high tensile residual stress to be measured at the welds. It was concluded that a method for determining appropriate dimensions of the hollow cylinder to be drilled and trepanned was successfully proposed to accurately assess through–thickness residual stress at the welds through DHD technique.https://www.jstage.jst.go.jp/article/transjsme/89/920/89_22-00288/_pdf/-char/endeep hole drilling techniqueweld residual stressreference holedrilling diametertrepanning diametercomputational welding mechanicsx-ray diffraction methodcontour method |
| spellingShingle | Masahito MOCHIZUKI Shigetaka OKANO High–accuracy measurement of through–thickness residual stress at welds through deep hole drilling technique Nihon Kikai Gakkai ronbunshu deep hole drilling technique weld residual stress reference hole drilling diameter trepanning diameter computational welding mechanics x-ray diffraction method contour method |
| title | High–accuracy measurement of through–thickness residual stress at welds through deep hole drilling technique |
| title_full | High–accuracy measurement of through–thickness residual stress at welds through deep hole drilling technique |
| title_fullStr | High–accuracy measurement of through–thickness residual stress at welds through deep hole drilling technique |
| title_full_unstemmed | High–accuracy measurement of through–thickness residual stress at welds through deep hole drilling technique |
| title_short | High–accuracy measurement of through–thickness residual stress at welds through deep hole drilling technique |
| title_sort | high accuracy measurement of through thickness residual stress at welds through deep hole drilling technique |
| topic | deep hole drilling technique weld residual stress reference hole drilling diameter trepanning diameter computational welding mechanics x-ray diffraction method contour method |
| url | https://www.jstage.jst.go.jp/article/transjsme/89/920/89_22-00288/_pdf/-char/en |
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