| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Innovative Process Design and Processing for Advanced Structural Materials
|
| Presentation Title |
A New Method for Measurement of Flow Stresses at High Strain Rates and Temperatures for Improved Simulation of Friction Stir Welding |
| Author(s) |
Kennen Brooks, Bryan Ramos, Matthew E. Goodson, Ryan Melander, David Prymak, Michael P. Miles, Tracy Nelson, Troy Munro, Fredrick Michael |
| On-Site Speaker (Planned) |
Matthew E. Goodson |
| Abstract Scope |
The modeling of friction stir welding has long been challenged by a lack of accurate flow stress data over the large range of temperatures and strain rates that are typical of the process. Most often, hot compression or hot torsion tests are used to measure flow stresses, but the strain rates and deformation modes associated with these tests do not emulate the high strain rate shearing that occurs near the friction stir welding tool. An alternate method of measuring flow stresses for the modeling of FSW is proposed, where a flat tool configuration is employed to shear AA 6061-T6 and AA 2219-T87 specimens at different rotational velocities and vertical loads. An analytical model of the shear layer is employed to estimate material viscosity and flow stresses for each test condition. FSW simulations using the measured flow stresses were compared to experiments as partial validation of the approach. |