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Questions About The Relation Between Mindlin's Strain Gradient and Eringen's Nonlocal Linear Elasticity Theories

Here are some definitions which I have in my mind about the hierarchy of field theories of any kind. Please read them and correct me if there is any misunderstanding. Then I shall raise two questions based on this model of thought about the Mindlin's strain gradient and Eringen's nonlocal linear elasticity theories.

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A UMAT Code In ABAQUS - Progressive Failure Analysis

I have written a UMAT code in ABAQUS. This UMAT degrades the young modulus of an isotropic elastic material at a point when the VonMises stress at that point reaches a specific value. It can be seen as a simple progressive failure code. I have applied this UMAT code to a Notched plate under uniform tension.

The problem is that exactly before the damage initiation, the ABAQUS/Standard diverges. I am sure that there is a very simple mistake that I just can't see!
:)

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