Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections
This work investigates the effect of gas pores, as bulk imperfections, on the fatigue strength of welded mild steel joints. Two test series containing different butt joint geometries and weld process parameters are included in order to achieve two variable types of pore sizes. Based on the √area-par...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-04-01
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| Series: | Metals |
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| Online Access: | http://www.mdpi.com/2075-4701/8/5/306 |
| _version_ | 1819243320828755968 |
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| author | Martin Leitner Yukitaka Murakami Majid Farajian Heikki Remes Michael Stoschka |
| author_facet | Martin Leitner Yukitaka Murakami Majid Farajian Heikki Remes Michael Stoschka |
| author_sort | Martin Leitner |
| collection | DOAJ |
| description | This work investigates the effect of gas pores, as bulk imperfections, on the fatigue strength of welded mild steel joints. Two test series containing different butt joint geometries and weld process parameters are included in order to achieve two variable types of pore sizes. Based on the √area-parameter by Murakami, the test series can be grouped into imperfections exhibiting √area < 1000 µm and √area > 1000 µm. Fatigue tests at a load stress ratio of R = 0.1 are performed, which act as comparison for the subsequent fatigue estimation. To assess the fatigue resistance, the approaches by Murakami, De Kazinczy, and Mitchell are utilized, which highlight certain differences in the applicability depending on the imperfection size. It is found that, on one hand, Murakami’s approach is well suitable for both small and large gas pores depending on the applied model parameters. On the other hand, the fatigue concepts by De Kazinczy and Mitchell are preferably practicable for large defects with √area > 1000 µm. In addition, the method by Mitchell incorporates the stress concentration factor of the imperfection, which can be numerically computed considering the size, shape, and location of the gas pore, as presented in this paper. |
| first_indexed | 2024-12-23T14:53:50Z |
| format | Article |
| id | doaj.art-07593ac7fc4e4acd9fc32824dc14a5c3 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-23T14:53:50Z |
| publishDate | 2018-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-07593ac7fc4e4acd9fc32824dc14a5c32022-12-21T17:42:51ZengMDPI AGMetals2075-47012018-04-018530610.3390/met8050306met8050306Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk ImperfectionsMartin Leitner0Yukitaka Murakami1Majid Farajian2Heikki Remes3Michael Stoschka4Christian Doppler Laboratory for Manufacturing Process based Component Design, Chair of Mechanical Engineering, Montanuniversität Leoben, 8700 Leoben, AustriaKyushu University, 819-0395 Fukuoka, JapanFraunhofer Institute for Mechanics of Materials IWM, 79108 Freiburg, GermanyDepartment of Applied Mechanics, School of Engineering, Aalto University, 02150 Espoo, FinlandChristian Doppler Laboratory for Manufacturing Process based Component Design, Chair of Mechanical Engineering, Montanuniversität Leoben, 8700 Leoben, AustriaThis work investigates the effect of gas pores, as bulk imperfections, on the fatigue strength of welded mild steel joints. Two test series containing different butt joint geometries and weld process parameters are included in order to achieve two variable types of pore sizes. Based on the √area-parameter by Murakami, the test series can be grouped into imperfections exhibiting √area < 1000 µm and √area > 1000 µm. Fatigue tests at a load stress ratio of R = 0.1 are performed, which act as comparison for the subsequent fatigue estimation. To assess the fatigue resistance, the approaches by Murakami, De Kazinczy, and Mitchell are utilized, which highlight certain differences in the applicability depending on the imperfection size. It is found that, on one hand, Murakami’s approach is well suitable for both small and large gas pores depending on the applied model parameters. On the other hand, the fatigue concepts by De Kazinczy and Mitchell are preferably practicable for large defects with √area > 1000 µm. In addition, the method by Mitchell incorporates the stress concentration factor of the imperfection, which can be numerically computed considering the size, shape, and location of the gas pore, as presented in this paper.http://www.mdpi.com/2075-4701/8/5/306fatigue strengthwelded jointsgas porosityfatigue assessment |
| spellingShingle | Martin Leitner Yukitaka Murakami Majid Farajian Heikki Remes Michael Stoschka Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections Metals fatigue strength welded joints gas porosity fatigue assessment |
| title | Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections |
| title_full | Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections |
| title_fullStr | Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections |
| title_full_unstemmed | Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections |
| title_short | Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections |
| title_sort | fatigue strength assessment of welded mild steel joints containing bulk imperfections |
| topic | fatigue strength welded joints gas porosity fatigue assessment |
| url | http://www.mdpi.com/2075-4701/8/5/306 |
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