ECI Digital Archives

Title

The smallest macroscale tensile test - a model to describe constrained flow at the microscale

Authors

Hi T. Vo, University of California, Berkeley, USAFollow
Evan Still, University of California Berkeley
Kiet Lam, University of California Berkeley
Aljaž Drnovšek, Jožef Stefan Institute
Laurent Capolungo, Los Alamos National Laboratory
Stuart Maloy, Los Alamos National Laboratory
Peter Chou, Electric Power Research Institute
Peter Hosemann, University of California Berkeley

Conference Dates

September 29-October 4, 2019

Abstract

This work addresses the strain response and plastic flow behavior of grain boundary or interface containing materials during small scale mechanical testing. We introduce a set of geometric criteria allowing us to constrain a sample to obtain macroscopic-like flow behavior on a microscale test, as shown in Figure 1. Furthermore, the featured parameter, the blocked volume ratio, provided a new description of plasticity of microscale tensile samples in a constrained volume due to external interfaces such as coating and grain boundaries. The proposed description was experimentally validated with different Ni-based materials and different constraints (grain boundary and coating interfaces). The developed theory would open new research avenues in establishing the connection between microscale response to bulk properties as follows:

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Recommended Citation

Hi T. Vo, Evan Still, Kiet Lam, Aljaž Drnovšek, Laurent Capolungo, Stuart Maloy, Peter Chou, and Peter Hosemann, "The smallest macroscale tensile test - a model to describe constrained flow at the microscale" in "Nanomechanical Testing in Materials Research and Development VII", Jon Molina-Aldareguia, IMDEA-Materials Institute, Spain Eds, ECI Symposium Series, (2019). https://dc.engconfintl.org/nanochemtest_vii/24