disortion of element

Hello everybody,

Specialist please answer. I make simulations of nanoindentation. I do it in ABAQUS Standard 6.7.1, till 20 nm it is OK. But as i increase the penetration depth, the simulation stops and the information that the element under the indenter is highly distorted. Do you know what is the reason. Does it mean that adaptive meshing doesn't work? Or some other problem.

Best regards

ABAgirl