Infinite contact_length Error - contact length calculation

[RichardPfr]

The contact_length is currently calculated like this:

pyroll-core/pyroll/core/roll_pass/hookimpls/roll.py

Lines 11 to 14 in 93bfbaf

	@RollPass.Roll.contact_length
	def contact_length(self: RollPass.Roll):
	height_change = self.roll_pass.in_profile.height - self.roll_pass.height
	return np.sqrt(self.min_radius * height_change - height_change ** 2 / 4)

Problem

In cases like in the following this height_change outputs a negative value which in turn causes an error in the return function:

This is because for the roll_pass.height PyRolL only looks at the tip depth of the groove and if that is grater than the incoming profile it thinks, that both dont touch at all so no contact length would be there.

Proposed Solution

As the picture above shows though there would logically be a contact_length.
Would it be feasible, to handle the contact length calculation differently in these cases, by looking at the intersection of groove and in_profile instead?

P.S.:
The Error that is output with the above:

[ChRen95]

Please attach a MWE to reproduce this error.

[RichardPfr]

MWE to reproduce the Error:

MWE_Export.zip

[ChRen95]

Okay, so the problem for this case is a bit manifold. On the one side we could implement a search algorithm that search the minimal contact length and therefore change this implementation on the other side, the case with is described here is not covered by the equivalent rectangle approach... underfilled grooves

[axtimhaus]

Solution for this already available in #251