Specialist support for critical shell-buckling decisions.

You already have a buckling verification. We review it and tell you what we find.

One clearly defined structure and its primary verification: applicability of the chosen method, geometry and boundary-condition assumptions, load definition, the elastic buckling basis, KDF selection, imperfection assumptions, plasticity treatment, interaction equations, safety and reserve factors, units and implementation — plus obvious conservatism or non-conservatism and whether the calculation actually supports the conclusion drawn from it.

• Independent Technical Review Memorandum
• Itemised observation and issue list
• Limited comparison against an alternative method where it is informative
• One review meeting with the reviewer

The memorandum states one of: no material technical objections within the agreed scope; observations and recommendations; points requiring clarification; or that the verification cannot be endorsed within the agreed scope. It is an independent engineering opinion — not an approval by an authority or an appointed checking engineer.

You give us the design inputs. We calculate it ourselves, without starting from your result.

An independent counter-verification: analytical calculation with the applicable recognised methods and the MDC approach, comparison between those methods, an independent view of the knockdown factor, imperfection sensitivity, load interaction and sizing sensitivity where relevant — then a comparison against your own calculation and, where you supply it, your FE result.

• Independent Buckling Verification Report
• Method comparison with the governing case identified
• Documented inputs, assumptions, limitations and exclusions
• Technical review meeting

The €9,900 entry price covers one structure with a defined set of load cases. Several structures, many load cases, composite or stiffened walls, interaction studies or an FE review are scoped individually.

Programme-level support where the difficulty is the engineering itself, not a single calculation.

Multiple structures and load cases, comparison across methods, FE comparison, sensitivity studies, an imperfection strategy for the programme, structural optimisation, review of supplier calculations, design-freeze support and technical decision support across repeated iterations and design reviews.

• GMNIA buckling verification — nonlinear FEA to EN 1993-1-6 §9.8 with curated, documented database imperfections, including the k_GMNIA evidence package (§9.8.4(39) check cases). From €18,000.
• Measured-imperfection allowables — you supply 3D or laser scan data (the measurement itself is not part of the service); we evaluate it to EN 1993-1-6 §9.4, run FEA with your measured imperfections in regime-correct form and derive a defensible A-/B-Basis allowable with representativeness documentation. From €30,000.
• Design review & technical defence — preparation for PDR, CDR or QR: the buckling assumptions are challenged before your reviewers do it, supporting calculations are prepared, and we take part in the technical meetings to answer questions on the methodology and defend the assumptions alongside your team. Expert participation and technical support during your formal design reviews — Skalnav is not the approving authority. From €45,000.

Turn specialist knowledge into a method your organisation owns and can defend.

A customer-specific buckling methodology or knockdown factor: calibration against your structures, validation datasets, an FE benchmark programme, comparison with experimental data, statistical assessment, method documentation, and implementation into your engineering workflow — including into Skalnav where that is the right home for it.

• Agreed methodology, documented
• Validation evidence behind it
• Implementation and documentation per the statement of work
• Qualification support through your review process

A full programme — V&V dossier, benchmark suite, test correlation, independent replication and a review data package carried through qualification — is project-priced from €150,000. Skalnav supports your qualification; it does not itself issue regulatory certification.

Put the expertise inside your own engineering team.

Classical elastic buckling, imperfection sensitivity, knockdown factors from the NASA SP-8007 philosophy through to modern approaches, axial, bending, torsion and external pressure, load interaction, plasticity, safety factors and sizing — with real engineering examples, the mistakes we see most often, and how analytical and FE results should be read against each other.

• Half-day company trainingfrom €4,500
• Full-day company workshopfrom €7,500
• Two-day advanced masterclassfrom €12,000
• Customer design workshop — your own structuresfrom €9,900 / day

Every format includes live training, presentation materials, worked examples and Q&A. The design workshop works on your real structures and your current methodology alongside the theory. Remote or on site; travel and accommodation are quoted separately. Teams on Team, Business or Enterprise can add Skalnav onboarding — method selection, workflows, sizing, reports — to any format.

A specialist lecture for your engineering organisation.

Why shell-buckling design stays conservative; from NASA SP-8007 to modern knockdown factors; imperfection sensitivity in thin-walled shells; what engineers get wrong about shell buckling; buckling under combined loading; lessons from six decades of collapse experiments; and designing closer to the real structural limit.

• Corporate technical talk, 60–90 min + Q&Afrom €3,500
• Specialist or executive briefing, prepared on your casefrom €5,000

Travel additional where required. Conference and academic speaking enquiries are welcome and handled case by case.