Hello,
I know that the definition of the indentation during the contact between two objects is the difference between the transverse displacement of the impactor and the target (a=w_imp-w_tar). But when it comes to 3-Dimensional elements, which can calculate different transverse displacement at the top surface and different at the bottom; is it possible that the indentation for the calculation of contact force (Fc=Ky*a), where Ky is the contact stiffness of the structure, is calculated differently?
"Hard contact" is an interaction that is used in normal direction. Transverse displacements infects tangential directions. There are several types of tangential behavior that You can choose.
But when You have an anisotropic friction model You have to specify two friction coefficients which are along local tangent directions (more info in: 37.1.5 Frictional behavior - Using the anisotropic friction model in Abaqus/Standard)
In conclusion. When You model contact in Abaqus You have to check tangent directions of your Slave surface.
For detailed information about local tangent directions You can check Abaqus documentation:
38.1.1 Contact formulations in Abaqus/Standard - Calculating the initial local tangent directions for a three-dimensional surface
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