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%% Copyright 2014 MERCIER David
function hardness = model_hardness_Guillonneau(load, stiffness, red_YM, varargin)
%% Function used to calculate the hardness using derivative of the contact depth from
% Guillonneau G. et al. (2014) - http://dx.doi.org/10.1016/j.triboint.2013.10.013
% author: david.mercier@crmgroup.be
% load: Applied load in mN
% stiffness: Stiffness in mN/nm
% red_YM: Reduced elastic modulus in GPa
if nargin < 3
red_YM = 1;
end
if nargin < 2
stiffness = 1;
end
if nargin < 1
load = 1;
end
hardness = 1e-6 .* (4 .* load .* (red_YM.^2)) ./ (pi * (stiffness.^2));
end
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