|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||2017 Technical Division Young Professional Poster Competition
||YP-7: Octo-Strain: A Novel Multiaxial Loading Device for In-situ Stress Measurements through Neutron Diffraction
||Justin Milner, Thomas Gnäupel-Herold
|On-Site Speaker (Planned)
We report on the design and first results from a novel mechanical loading device that was conceived specifically for measuring the applied stresses using neutron diffraction. The purpose of this device is to obtain multiaxial yield stresses of sheet metal samples at large magnitudes of strain. The full strain field is determined using a dedicated digital image correlation system (DIC); thus, the macroscopic plastic strain tensor is known precisely in the neutron gauge volume. The device is an eight-arm device called Octo-Strain that was designed for a variety of planar straining scenarios and large magnitudes of strain as compared to cruciform testing. Now possible strain paths are a plane strain expansion followed by another plane strain expansion at a 45-degree angle to the major strain axis. The ability of 360-degree rotation allows measurements for any in-plane orientation of the scattering vector for the determination of the stress tensor.