Elastic and elasto-plastic modelling of indentation in CFRP cross-ply laminates has been performed.
The spatial variation of this stress is shown to be consistent with simple elastic/plastic models of indentation.
This dependence was analyzed and compared to existing models of indentation based on the concept of geometrically necessary dislocations.
Finally, a comprehensive discussion on the accuracy of flow vs. deformation plasticity theories in the modeling of indentation experiments is provided.
In conjunction with experimental and numerical methods, analytical models of indentation response and energy balance specifically aimed to solve problems of low-velocity impact of a spherical indenter on sandwich panels were deduced.
Analytical models on indentation of a layered half-space for a circular punch proved the validity of the following empirical formula [13]: 1 E s * = 1 E film * [ 1 − exp ( − γ t a ) ] + 1 E sub * exp ( − γ t a ), (2).
However, parameter identification of the hyperelastic material properties of plantar soft tissues usually requires an inverse finite element analysis due to the lack of a practical contact model of the indentation test.
The time domain model of calculating indentation areas, as well as regenerative dynamic uncut chips, is formulated for the prediction of the stabilizing effect induced by interference areas between the edge profiles and undulation left on a workpiece.
This step is accomplished by probing the function of interest using a suitably constructed FE model of spherical indentation, and establishing a compact spectral representation of the desired function using the discrete values obtained from the simulations.
