Understanding the non-local behavior for solid laminates (Simcenter Samcef)

Non-local behavior

In the classical local approach,

damage is computed from Y and internal forces are classically computed as:

The Non-local approach for computing damages introduce non-local thermodynamic forces as unknowns in the equations to solve:

The unknowns are the three displacements (u, v and w) at the element's nodes and the non-local thermodynamic forces.

If Ynloc is taken constant over the element thickness, damage is constant over the thickness, which is one of the hypotheses of Enhanced UD Ply Damage material.

This formulation is available for the UD Ply Damage, Enhanced UD Ply Damage, and Woven Ply Damage damage material laws. For more details on these material laws, see Damage models for Orthotropic materials (Simcenter Samcef).

Thermodynamic loads choices

Different choices are available for the non-local thermodynamic forces:

• Continuous — The force is constant over the element thickness, linear over the element surface, and continuous from one element to the next one.

• Non Continuous — The force is constant over the element thickness, constant (1st degree element) or linear (2nd order element) over the element surface, and discontinuous from one element to the next element.

• Local — This is a local version of the element.

• Fibers — This version can be used only for the Enhanced UD Ply Damage material. There is a Continuous option for fiber damage and a Non Continuous option for the other damages. This option reduces the CPU cost by comparison to a Continuous-only option.

For more details on the non-local behavior, see the Simcenter Samcef structure library documentation.

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Understanding the non-local behavior for solid laminates (Simcenter Samcef), Simcenter 3D 2021.1 Series

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