Draft. This manual is new and still growing. If something here does not match what you see in the software, the software is right — tell us and we will fix the page.
Structural material
Where it is
Not a setup-tree node. Embedded in the application.
Controls
MATERIAL
Browse…
- Control: action (
ToolButton2)
Young's modulus E
- Control: value (
ValueField) - Unit: GPa
- Value modes: none (plain entry)
Stiffness. Steel is about 210 GPa, aluminium 70.
Poisson's ratio ν
- Control: value (
ValueField) - Value modes: none (plain entry)
How much it bulges when compressed. Metals are near 0.3; 0.5 is incompressible and cannot be solved.
Density ρ
- Control: value (
ValueField) - Unit: kg/m³
- Value modes: none (plain entry)
The in-app guidance depends on the case:
- Modal frequencies scale with sqrt(E/ρ), so this one decides the answer.
- Read by a modal analysis and by gravity loads; ignored by a static solve without one.
Ultimate strength
- Control: value (
ValueField) - Unit: MPa
- Value modes: none (plain entry)
- Shown when:
StructuralState.analysis === "Fatigue"
The high-stress end of the S-N line, taken at the low cycle count below.
...at cycle count
- Control: value (
ValueField) - Value modes: none (plain entry)
- Shown when:
StructuralState.analysis === "Fatigue"
1000 is the usual convention for the ultimate-strength point of the S-N line.
Endurance limit
- Control: value (
ValueField) - Unit: MPa
- Value modes: none (plain entry)
- Shown when:
StructuralState.analysis === "Fatigue"
The low-stress end, at the high cycle count below. Defaulted to half the ultimate, which is the usual estimate for steel — aluminium has no true endurance limit and this will be optimistic.
...at cycle count
- Control: value (
ValueField) - Value modes: none (plain entry)
- Shown when:
StructuralState.analysis === "Fatigue"
1e6 is the usual convention for steel's endurance-limit point. A material with no true endurance limit needs a real number here instead — a million cycles read as infinite life for one is the optimistic case the field above already warns about.
Yield strength
- Control: value (
ValueField) - Unit: MPa
- Value modes: none (plain entry)
- Shown when:
StructuralState.analysis === "NonlinearStatic"
Where the material stops returning to its original shape. Mild steel is about 250 MPa. Zero means the library publishes none for this material — state it here.
Post-yield slope
- Control: value (
ValueField) - Unit: GPa
- Value modes: none (plain entry)
- Shown when:
StructuralState.analysis === "NonlinearStatic"
How much stress still rises after yield, as a modulus rather than a stress. Usually near E/100 — 2.1 GPa for steel. It must be less than E, or the part would be stiffer after yielding.
Problems reported against this step
The application reports no problems against this step.
… marks a value the application computes at run time, so the source carries no fixed text for it.