40:. As two solid bodies of the same material approach one another, the asperities interact, and they transition from conditions of non-contact to homogeneous bulk behaviour, with changes in the contact area. The varying values of stiffness and true contact area at an interface during this transition are dependent on the conditions of applied pressure and are of importance for the study of systems involving the physical interactions of multiple bodies including
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or a second similar rough surface. Specifically it is the amount of force per unit displacement required to compress an elastic object in the contact region. Rough surfaces can be considered as consisting of large numbers of
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Zhai, C.; Gan, Y.; Hanaor, D.; Proust, G.; Retraint, D. (2016).
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Contacting surfaces with applied normal and tangential forces
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