The smallest macroscale tensile test - a model to describe constrained flow at the microscale
September 29-October 4, 2019
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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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