From Challenges to Solution: Interactive 3DX Canvas Session - Join us on July 22nd

When running 3D DRC in Allegro on high-density flex-rigid assemblies, how does the system handle dynamic bend tolerances alongside spatial component collisions? Specifically, can 3D DRC evaluate clearance constraints against imported STEP geometries (like non-uniform thermal brackets) while accounting for the thermal expansion (CTE) or deformation state of the flex substrate?

The system manages spatial collisions by checking 3D CAD models or component shapes which is Place Bound/DFA Bound against each other.

 We have Component to Rigid-Flex checks available which checks models or shapes of a component against the outer surface of a rigid-flex.
Dynamic Bends: The 3D DRC engine accounts for the bend state of the flex substrate. For example, if a flex portion is bent, the system measures the vertical distance from the component to the flex surface. If the clearance is insufficient, you can resolve the DRC by interactively changing the inner radius of the bend, which repositions the flex portion in 3D space

 For Thermal Expansion (CTE) and Deformation States, While the 3DX Canvas is highly effective at evaluating clearances in different deformation states (such as bent vs. flat flex substrates), the standard 3D DRC engine primarily focuses on geometric clearances based on the current physical state of the design.

Deformation State: The system evaluates DRCs based on the specific bend parameters defined in the design. It does not natively simulate real-time material deformation or thermal expansion (CTE) within the 3D DRC check itself.
Inter-Layer DRC: For rigid-flex designs, you can use Inter-Layer DRC to check for overlaps or spacing requirements between different material classes (like stiffeners and masks) that are critical for fabrication and assembly.

 For advanced thermal expansion or stress analysis, you would typically export the 3D representation of the design from the 3DX Canvas to a dedicated simulation tool.

The system manages spatial collisions by checking 3D CAD models or component shapes which is Place Bound/DFA Bound against each other.

 We have Component to Rigid-Flex checks available which checks models or shapes of a component against the outer surface of a rigid-flex.
Dynamic Bends: The 3D DRC engine accounts for the bend state of the flex substrate. For example, if a flex portion is bent, the system measures the vertical distance from the component to the flex surface. If the clearance is insufficient, you can resolve the DRC by interactively changing the inner radius of the bend, which repositions the flex portion in 3D space

 For Thermal Expansion (CTE) and Deformation States, While the 3DX Canvas is highly effective at evaluating clearances in different deformation states (such as bent vs. flat flex substrates), the standard 3D DRC engine primarily focuses on geometric clearances based on the current physical state of the design.

Deformation State: The system evaluates DRCs based on the specific bend parameters defined in the design. It does not natively simulate real-time material deformation or thermal expansion (CTE) within the 3D DRC check itself.
Inter-Layer DRC: For rigid-flex designs, you can use Inter-Layer DRC to check for overlaps or spacing requirements between different material classes (like stiffeners and masks) that are critical for fabrication and assembly.

 For advanced thermal expansion or stress analysis, you would typically export the 3D representation of the design from the 3DX Canvas to a dedicated simulation tool.

Since CTE and material deformation require dedicated external solvers, is there a streamlined or automated bi-directional workflow (such as via IPC-2581 or Celsius) to re-import calculated thermal deformation mesh data back into the 3DX Canvas so 3D DRC can be run against the actual deformed state?

In Allegro X PCB Editor, while there may a tight integration with the Celsius Thermal Solver for thermal analysis, there is currently no automated, bi-directional workflow to re-import a calculated thermal deformation mesh data directly into the 3DX Canvas for automated 3D DRC.

If an external solver (like Celsius or an MCAD tool) calculates a deformed state due to CTE or mechanical stress, that state can be exported as a STEP file.
You can then try to re-import this "deformed" STEP model into Allegro as a mechanical component or enclosure. The 3D DRC engine in 3DX Canvas can then evaluate clearances between your PCB components and this deformed geometry.

IDX Flow: For complex mechanical changes involving outlines, zones, and bends, the IDX flow is the recommended method for bi-directional data exchange between Allegro and mechanical tools.

Okay …. 

When importing a 'deformed' STEP model from an external solver back into Allegro 3DX Canvas, how does the 3D DRC engine handle net-aware collision checking? Does the imported STEP retain component and pin-level net intelligence, or is it evaluated strictly as a passive mechanical keepout enclosure?

The imported STEP model is treated as a mechanical body. While it can be associated with a net-aware component through mapping, the 3D DRC engine evaluates it as a physical enclosure for collision purposes rather than a net-intelligent electrical object with pin-specific connectivity