1 research outputs found
Accounting for localized deformation: a simple computation of true stress in micropillar compression experiments
Compression experiments are widely used to study the mechanical properties of
materials at micro- and nanoscale. However, the conventional engineering stress
measurement method used in these experiments neglects to account for the
alterations in the material's shape during loading. This can lead to inaccurate
stress values and potentially misleading conclusions about the material's
mechanical behavior especially in the case of localized deformation. To address
this issue, we present a method for calculating true stress in cases of
localized plastic deformation commonly encountered in experimental settings:
(i) a single band and (ii) two bands oriented in arbitrary directions with
respect to the vertical axis of the pillar (either in the same or opposite
directions). Our simple analytic formulas can be applied to homogeneous and
isotropic materials and crystals, requiring only standard data
(displacement-force curve, aspect ratio, shear band angle and elastic strain
limit) obtained from experimental results and eliminating the need for finite
element computations. Our approach provides a more precise interpretation of
experimental results and can serve as a valuable and simple tool in material
design and characterization.Comment: arXiv admin note: text overlap with arXiv:2012.1278