Influence of Weld-Porosity Defects on Fatigue Strength of AH36 Butt Joints Used in Ship Structures
Experimental tests were carried out to assess the fatigue strength of four types of welded joints, made of AH36 steel and used for ship structures. The joints differ for the presence of weld defects and for the thickness value. Fatigue tests were carried out applying axial cyclic loads at a frequenc...
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| Veröffentlicht in: | Metals (Basel ) 2021-03, Vol.11 (3), p.444 |
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| creator | Crupi, Vincenzo Epasto, Gabriella Guglielmino, Eugenio Marinò, Alberto |
| description | Experimental tests were carried out to assess the fatigue strength of four types of welded joints, made of AH36 steel and used for ship structures. The joints differ for the presence of weld defects and for the thickness value. Fatigue tests were carried out applying axial cyclic loads at a frequency of 20 Hz and at a stress ratio R = 0.5. The temperature e increment of the specimen surface was detected during the load application by means of an infrared camera. The analysis of the thermographic images allowed the assessment of both the fatigue strength of the welded joints, applying the rapid thermographic method, and the S-N curve by the energy approach. Moreover, 3D computed tomography was used for the analysis of the defective welded joints. |
| doi_str_mv | 10.3390/met11030444 |
| format | Article |
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The joints differ for the presence of weld defects and for the thickness value. Fatigue tests were carried out applying axial cyclic loads at a frequency of 20 Hz and at a stress ratio R = 0.5. The temperature e increment of the specimen surface was detected during the load application by means of an infrared camera. The analysis of the thermographic images allowed the assessment of both the fatigue strength of the welded joints, applying the rapid thermographic method, and the S-N curve by the energy approach. 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The joints differ for the presence of weld defects and for the thickness value. Fatigue tests were carried out applying axial cyclic loads at a frequency of 20 Hz and at a stress ratio R = 0.5. The temperature e increment of the specimen surface was detected during the load application by means of an infrared camera. The analysis of the thermographic images allowed the assessment of both the fatigue strength of the welded joints, applying the rapid thermographic method, and the S-N curve by the energy approach. Moreover, 3D computed tomography was used for the analysis of the defective welded joints.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/met11030444</doi><orcidid>https://orcid.org/0000-0003-1372-5871</orcidid><orcidid>https://orcid.org/0000-0001-9878-2941</orcidid><orcidid>https://orcid.org/0000-0001-7498-4733</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Aluminum alloys Butt joints Computed tomography Crack initiation Cyclic loads Defects fatigue Fatigue life Fatigue strength Fatigue tests Growth models Infrared analysis Infrared cameras Metal fatigue Porosity S N diagrams S-N curve ship structures Stress concentration Stress ratio thermographic method Thermography Weld defects Welded joints X-rays |
| title | Influence of Weld-Porosity Defects on Fatigue Strength of AH36 Butt Joints Used in Ship Structures |
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