Modeling 3-Point Bending Test of Sandwich Panel: OptiStruct or Radioss?

Ig0r_AFerreira

Hello everyone,

I am working on a FE simulation of a 3-point bending test on a sandwich panel using HyperMesh 2025.1.

Model Details:

• Components: Top and bottom face sheets + different types of core formats
• Material: All metallic parts.
• Interface: The face sheets are bonded to the core crests using a resin layer.

Objectives:

1. Evaluate the overall structural resistance of the panel under bending.
2. Analyze the failure criteria (including potential yielding of the steel or debonding of the resin).

My Questions:

1. Solver Choice: For a 3-point bending test focusing on failure, would you recommend OptiStruct (Implicit) or Radioss (Explicit)? I am looking for a balance between accuracy in failure prediction and computational efficiency.
2. Resin Representation: Given that the resin layer is very thin, should I model it with 3D Solid Elements, or is it better to use Cohesive Elements or Tied Contacts with failure properties?
3. Contact: What is the best way to handle the contact between the rollers (indenter/supports) and the thin shell face sheets?

Any insights or best practices for modeling sandwich structures would be greatly appreciated.

Thanks!