This is evident in many applications, such as: jointed structures ( Brake, 2016), electrical contacts ( Ghaednia et al., 2014), thermal contacts ( Jackson et al., 2012), collision mechanics ( Brake, 2012, 2015 Ghaednia et al., 2015 Gheadnia et al., 2015 Ghaednia and Marghitu, 2016 Brake et al., 2017), continum mechanics ( Golgoon et al., 2016 Golgoon and Yavari, 2017, 2018), biomechanics ( Zhao et al., 2007 Borjali et al., 2017, 2018, 2019 Langhorn et al., 2018 Mollaeian et al., 2018), turbines ( Firrone and Zucca, 2011), additive manufacturing ( Kardel et al., 2017 Pawlowski et al., 2017), bearings ( Sadeghi et al., 2009), particle and powder interactions ( Christoforou et al., 2013 Rathbone et al., 2015), and seals ( Green and Etsion, 1985 Miller and Green, 2001) amongst other applications. These results are used to derive a new, predictive formulation to account for the bilinear strain hardening from elastic-perfectly plastic to purely elastic materials.įundamental to all assembled systems, contact mechanics is integral to mechanical design. Pile-up behavior is observed for elastic-perfectly plastic materials, while for strain hardening values greater than 6%, only sink-in (i.e., no pile-up) is seen. Simulations show that even 1% strain hardening causes significant changes in the contact parameters and contact profile. In this study, the effect of bilinear strain hardening on the contact parameters for indentations is investigated. Although several contact models have been developed to relate force-displacement measurements with the mechanical properties, they all consider simplifying assumptions, such as no strain hardening, which significantly affects the predictions.

Indentation measurements are a crucial technique for measuring mechanical properties. 5Department of Mechanical Engineering, William Marsh Rice University, Houston, TX, United States.4Department of Mechanical Engineering, William Marsh Rice University, Houston, TX, United States.3Department of Physics, William Marsh Rice University, Houston, TX, United States.

2Department of Mechanical Engineering, Auburn University, Auburn, AL, United States.

1Department of Orthopaedic Surgery, Harvard Medical School, Boston, MA, United States.

Hamid Ghaednia 1, Gregory Mifflin 2, Priyansh Lunia 3, Eoghan O.

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