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Laminated shell benchmark · VNV-COMP-NAFEMS-R0031-CODEASTER-004

NAFEMS R0031 laminated shell correlation

Five mesh levels compare transverse displacement at point E for a laminated strip in three-point bending.

Experimental · Owner review pendingCampaign version 0.2.1-alpha
Read the recorded results← All calculation cases
Five refinement levels compared with the published scalar target. Stabilization is visible; monotone convergence to an exact solution is not established.
QF Solver and Code_Aster displacement UZ at point E across five NAFEMS R0031 meshes.

Five refinement levels compared with the published scalar target. Stabilization is visible; monotone convergence to an exact solution is not established.

Recorded values

Main observables and references

Values come from the linked campaign record. Acceptance thresholds are shown separately from observed results.

QF Solver UZ at point E−1.064851 mmFinest mesh: 5,120 elements; target −1.06 mm
Code_Aster UZ at point E−1.067529 mmFinest mesh: 5,120 elements; target −1.06 mm
QF Solver / Code_Aster difference0.2509%Finest mesh
Final refinement increment0.0967% / 0.0920%QF Solver / Code_Aster; threshold 0.2%
Model and execution

What was calculated?

  • The benchmark is the published NAFEMS R0031/1 laminated strip in three-point bending.
  • QF Solver and Code_Aster compare UZ at point E across 20, 80, 320, 1,280 and 5,120 shell elements.
  • The public target is UZ(E) = −1.06 mm. The campaign date is 14 August 2026.
How to read the evidence

What the results say

  • At the finest mesh, QF Solver gives −1.064851 mm and Code_Aster gives −1.067529 mm, a mutual difference of 0.2509%.
  • The final refinement increments are 0.0967% for QF Solver and 0.0920% for Code_Aster, below the campaign threshold of 0.2%.
  • Both curves stabilize while moving slightly away from the finite precision published target. This is not monotonic convergence to a known exact asymptote.

Additional figures from this calculation

Select a figure to inspect it at full size. Captions state the quantity, comparison and any display amplification available in the source.

Laminated strip under three-point bending. S11 is informative and is not a pointwise acceptance criterion.
NAFEMS R0031 laminated strip mesh and deformed shape under three-point bending.

Laminated strip under three-point bending. S11 is informative and is not a pointwise acceptance criterion.

Scope boundary

Where this case stops

  • The record is a draft for version 0.2.1-alpha and remains experimental pending Owner review.
  • S11 is informative rather than a pointwise acceptance measure. S13 is unavailable; delamination, progressive failure and physical calibration are outside this campaign.

Open the calculation method

These white box sheets explain the element, constitutive law or numerical method used by this case.

White box sheetMITC4 shell formulationWhite box sheetLaminate ABD lawWhite box sheetExternal correlation method

Reproduce and inspect the source

The source paths below are pinned to one repository commit. Opening the current site does not rerun the original calculation.

Draft comparison recorddocs/verification/composite_code_aster_nafems_2026-08-14.mdGenerated campaign reportqualification/vnv/external/code_aster_composite_nafems/reference/report.mdCampaign summaryqualification/vnv/external/code_aster_composite_nafems/reference/summary.json

Figure and source snapshot e367fe58b2b9ebb4aef321424ca775e80e82d9ca. Campaign execution version: 0.2.1-alpha. Current site release and original calculation version identify different events.

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