Detail loads models for FEMAP and Nastran, built by a specialist.
SeStructures builds the finite element models your structures team needs and rarely has time to build well: dynamics models, static loads models and fastener-level detail models. You get clean FEMAP and Nastran files, a verification package, and a model your analysts can trust on day one.
What we build
Models sized for the question they have to answer: no heavier than the loads require, no lighter than the stress check allows.
Dynamics models
Shell idealizations tuned for modal accuracy: normal modes, modal effective mass, random vibration, sine and shock, and correlation to test data.
Dynamics →Static & loads models
Load-path models that give you interface loads, freebodies and margins you can defend: brackets, decks, panels, bolted installations.
Statics →Fastener-level detail models
Bolted joints modeled the way the margins need them: fastener stiffness, bearing and bypass, preload and contact where it matters.
Fastener models →Also: model checks and third-party review, FEMAP API and Nastran automation, and the rest of the stress toolbox — fatigue, damage tolerance, test data reduction.
How an engagement works
Fixed scope where the scope is clear; hourly where it is not. Either way you know what you are getting before work starts.
Send the CAD
STEP or native CAD through the secure file drop, with a few lines on loads, interfaces and the deadline. An NDA is available if you need one first.
Scope it
A short call to settle what the model must answer, the fidelity it needs, and what you want handed back. You get a written quote.
Build and check
Idealization, mesh, properties, connections, mass and boundary conditions — with the checks run and recorded, not assumed.
Hand it over
FEMAP model, Nastran decks and a check report — and, if you want it, a walkthrough with your analysts so the model keeps earning its keep after we are gone.
Online tools
Automated services for the questions that do not need an engineer in the loop — and a short path to one when they do.
Modal Advisor Live
Stiffness and weight advice from one solid part
Upload one solid part as STEP. In minutes you get an interactive report showing where to add material to make the part stiffer, and where to take material out to make it lighter without losing stiffness.
Open Modal Advisor
Beam calculator Beta
The classical beam tables, solved instead of looked up
Shear, moment, slope and deflection diagrams for a single-span beam with any mix of pinned, fixed, free and guided ends under point, uniform, linearly varying and moment loads. Closed-form solutions derived from the beam equation; the derivation is on the page. Runs in your browser.
Open the beam calculator
Shell Mesh Service Early access
A finished shell model from one solid part
Upload one solid part and get back a shell (mid-surface) finite element model ready for FEMAP and Nastran: thin walls idealized, mid-surfaces built and connected, a clean quad-dominant mesh, measured thicknesses, mass matched to the solid — and the modes verified against a solid mesh of the same part.
Request early accessEngineering Tools Free
FEMAP / Nastran productivity macros
Our sister site engineeringtools.org gives away a suite of free FEMAP/Nastran tools: mode identification, FEM organization by connectivity, spring and fastener forces to Excel, Nastran job batching and dozens more. Two-minute install, free sign-up.
Visit engineeringtools.orgWhy a specialist
Most of the work here is shell models — and every shell model is checked against a solid mesh of the same part before it leaves. That habit is what the Shell Mesh Service automates, and it is why the models hold up when your reviewers start pulling on them.
- FEMAP and Nastran daily, both the NX/Simcenter and MSC flavours, including MSC SOL 400 contact and bolt preload.
- Co-author of Engineering Tools: 65 free FEMAP/Nastran macros used by the community, written to make repetitive model work disappear.
- Experience from aircraft and launch OEMs to spacecraft buses and STC mod shops; FAA, DoD, NASA and customer requirement sets.
- US-based, one point of contact, and a model you can open the day it arrives.
