Modelling of ultrasonic impact treatment (UIT) of welded joints and its effect on fatigue strength
Ultrasonic impact treatment (UIT) is a remarkable post-weld technique applying mechanical impacts in combination with ultrasound into the welded joints. In the present work, a 3D simulation method including welding simulation, numerical modelling of UIT-process and an evaluation of fatigue crack g...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2015-10-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero34/numero_34_art_53.pdf |
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| Summary: | Ultrasonic impact treatment (UIT) is a remarkable post-weld technique applying mechanical
impacts in combination with ultrasound into the welded joints. In the present work, a 3D simulation method
including welding simulation, numerical modelling of UIT-process and an evaluation of fatigue crack growth
has been developed. In the FE model, the actual treatment conditions and local mechanical characteristics due
to acoustic softening are set as input parameters. The plastic deformation and compressive stress layer are
found to be more pronounced when acoustic softening takes place. The predicted internal residual stress
distributions of welded joint before and after UIT are compared with experimental results, showing a fairly
good agreement with each other. Finally, simulated results of fatigue crack growth in various residual stress
fields are well compared with test results, so that the proposed model may provide an effective tool to simulate
UIT-process in engineering structures. |
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| ISSN: | 1971-8993 1971-8993 |