I am simulating Single point incremental forming on Abaqus CAE. Analysis completes successfully but i am not getting any plastic deformation on sheet.
I gave an absurd value of 4mm depth of cut just to see what happens and still the sheet only undergoes elastic deformation.
Warning: THE YIELD STRESS RATIOS GIVEN DEFINE NON POSITIVE CONSTANTS FOR HILL'S STRESS FUNCTION.
Please suggest relevant changes. Thank you in advance.
Vibhor,
I dont know about this warning. Did you incorporate any hardening law (i. e. isotropic or kinematic) into Abaqus before you start deforming?
@orkun:
Yes. I have defined a *potential card. and *plastic values.
@franco
I calculated values from stress-strain curve.
@sharad
Boundary conditions is "encastre" on sheetmetal edges. and i have defined tool path. Process i am trying to simulate is Single point incremental sheetmetal forming.
I have experienced something similar and solved by modifying the properties particularly density
It seems you defined ansiotropic plastic behaviour (Hills's function) but did it incorrectly. I would recommend to switch to something simpler - start with ideally plastic, then plasticity with hardening and then switch to aniisotropy (if this is what you want) to see where exactly the problem lies.
Perhaps a look into the inp-file material card may also show whether you unintentionally clicked some options.
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