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• W3080797764 endingPage "106039" @default.
• W3080797764 startingPage "106039" @default.
• W3080797764 abstract "The developed ultrasonic assisted friction stir welding (UaFSW) process can reduce the welding load and improve the joint quality, but the interaction mechanism between the exerted ultrasonic vibration and the thermo-mechanical behavior induced by friction stir welding is not yet elucidated. In this study, the classical Norton friction model is modified with the acoustic stress work, and the effect of ultrasonic vibration on the contact state at the tool/workpiece interface is analyzed. The relative velocity between the tool and its adjacent contacting material is taken as one of the main influencing factors to calculate the interfacial friction shear stress. A non-uniform interfacial friction model is combined with the modified constitution equation. And a fully coupled model of UaFSW process is developed to analyze the ultrasonic field, interfacial contact state, heat generation, plastic material flow and heat transfer phenomena. It is found that ultrasound can effectively reduce the interfacial friction stress, and this antifriction effect is more obvious in the welding direction which coincides with ultrasonic vibration. The ultrasound exerted along the radial direction of tool in UaFSW process results in acoustic softening of base material and friction reduction at the tool/material interface. Both effects change the heat generation, material flow and temperature field in UaFSW. Thus, the torque and traverse force are lowered with the ultrasonic induced reduction of interfacial stress, and the high quality of welds are obtained with the improvement of material flow. The model is experimentally validated by comparison of predicted and measured tool torque, heat input and thermal cycles." @default.
• W3080797764 created "2020-09-01" @default.
• W3080797764 creator A5001684665 @default.
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• W3080797764 date "2021-01-01" @default.
• W3080797764 modified "2023-10-17" @default.
• W3080797764 title "Acoustic induced antifriction and its effect on thermo-mechanical behavior in ultrasonic assisted friction stir welding" @default.
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• W3080797764 doi "https://doi.org/10.1016/j.ijmecsci.2020.106039" @default.
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