About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Materials Processing and Kinetic Phenomena: From Thin Films and Micro/Nano Systems to Advanced Manufacturing
|
Presentation Title |
Determination of the Friction Stir Welding Window from the Solid-state-bonding Mechanics under Severe Thermomechanical Conditions |
Author(s) |
Yanfei Gao, Xue Wang, Martin McDonnell, Zhili Feng |
On-Site Speaker (Planned) |
Yanfei Gao |
Abstract Scope |
Using the friction stir welding (FSW) technique as an example, this talk addresses two critical issues in solid state additive manufacturing. First, we prove the existence and origin of the interface stick-slip behavior of the frictional contact between the tool and workpiece. The mechanistic analysis allows us to correlate processing parameters such as the tool spin rate to the resulting torque and heat generate rate, as well as to derive key expressions for the strain-rate and temperature fields that are needed for the bonding analysis. Second, we note that the evolution of interfacial cavities (or pores, voids, etc.) under applied thermomechanical loading histories is a reverse process of the high-temperature creep fracture of polycrystalline materials by grain-boundary cavities, as dictated by both a lateral diffusive process and the creep deformation. This viewpoint allows us to derive an approximate but analytical solution for the determination of process window. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Joining, Modeling and Simulation |