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directional yielding

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how do you specify plastic nonlinear behavior in just the 3-axis and no yielding in the 1 and 2 -axes??
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Possibly try using *potential with values set very high for 1 and 2. This would result in a very high yield stress for these two directions. It might work.

Brad
 
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the anisotropic yield in ABAQUS makes use of the Hill's potential function, which doesn't work in my application (modeling uniaxial compressive behavior of bone). what i have is the stress-strain data at various points that describe the nonlinear plastic behavior, but the input data is only valid in the 3-axis, which i guess i have to set high yield stress for the other 2 axes. i think *orientation allows me to define orthotropic material properties, but i don't know how to specify the directions.
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