b'Benchmarking Microscale Ductility MeasurementsPrincipal Investigator: Owen T. Kingstedt (University of Utah)Team Members/ Collaborator: Ashley Spear (University of Utah), Jiyoung Chang (University of Utah), Ryan Berke (Utah State University)The simulation tools andI on bombardment is an attrac- In achieving these objectives, the tive technique to efficientlyexperimental mechanics community induce damage that mimicswill be provided with straightforward, experimental techniquesthat produced during prolongedeconomical approaches to multi-developed through thisin-service irradiation exposure.lengthscale specimen production, project enable informedHowever, the damaged materialnew grid-based full-field techniques macroscale ductilitylayer is limited to a few micrometerstranslated to the microscale, and predictions to bein depth. To evaluate the mechan- methods for obtaining high-quality obtained from a limitedical performance of this damagedtensile mechanical behavior measure-number of microscalelayer improvements are necessaryments at reduced length scales. specimens. in our approaches to microscaleWhile the proposed approaches have tension testing, particularly whentraditional throughput capabilities, attempting to assess ductility.informed LS-EVP FFT frameworks are Ductility is a material performanceleveraged to simulate thousands of metric directly tied to structuralrepresentative microstructure instan-health. Multi-length scale experi- tiations for specimens of different mentation and a non-local damagegeometric ratios. In addition, incorpo-large strain elasto-viscoplastic fastrating non-localized damage allows Fourier transform (LS-EVP-FFT)for close correspondence between based crystal plasticity model aremicrostructurally driven deformation combined to develop approachesheterogeneities and failure processes to enable the upscaling of ductilityobserved in experiments.measurements obtained fromMeeting these objectives directly microscale specimens to predictsupports the needs of Department macroscale component ductility. of Energy (DOE) to meet its goal Project Description: of continued safe, reliable, and The technical objectives of theeconomic operation of the nations research are 1) to establish practicesreactor fleet. By providing tech-for obtaining tensile microscaleniques that can be used to assess ductility measurements and 2) tothe structural health of legacy and identify methodologies for comparingnext-generation nuclear materials, microscale ductility measurements tothe DOE will be better able to make macroscale ductility measurements.informed decisions as to when nuclear 48 2022|AFC ACCOMPLISHMENTS'