Is there a way to change default ACIS precision in Abaqus/CAE?
According to Abaqus documentation, ACIS uses a precision of 1E–6 to define a geometric entity. This means that maximum allowed deviations in imported geometric models are expected to be less than 1/1000000 of length unit of a model. Otherwise a part may become imprecise or invalid.
The problem is that design engineers of many countries build geometric models in millimeters with standard precision of 0.001 mm. When imported to Abaqus, such parts are almost always marked as imprecise, because deviations are only within 1/1000 of length unit. For example, a model on the picture below was built in mm and has fine geometry in CAD system but becomes imprecise in Abaqus/CAE.
Some geometric operations in Abaqus/CAE such as partitioning often fail on such "imprecise" geometry, which makes desired meshing cumbersome or even impossible. A real trouble begins when an initial model is not fine in CAD system. For example, a precision of 0.01 mm or larger is needed to close all gaps between faces of a solid. In this case most likely Abaqus/CAE will consider such model as invalid, despite it is only imprecise and still workable.
So, is it possible for users to change ACIS precision to respect commonly used design standards?
