Aerospace 2020 Release Notes

Solid Core Geometry on Plies

Solid geometry can now be used to define the shape of the ply. This geometry can be selected manually or come from external composite data. Upon ply realization, a drape table with thickness defined spatially is created for each ply with solid geometry.

Stress Tool for Margin of Safety Calculations

The following new margin of safety and failure calculations have been added to the Stress tool (Aerospace > Certification > Certify).

• Composite failure calculation
• Metallic panel margin of safety calculations

The composite failure calculation is based on the Altair ESACOMP solver.

The following failure methods are supported using element running loads Nx, Ny, Nxy.

Figure 1. List of Failure Mode Selection by Assigning the Correct Material Property

The following MS safety methods are added using elemental forces. The framework allows you to add your own methods via Python, C++ or Compose (OML). Tensile, compressive, shear ultimate failure and compression-shear buckling margins are enabled.

If $\sigma$ _xx > 0, MS= $\sigma$ _xx/F_tu-1; if $\sigma$ _xx < 0, MS= $\sigma$ _xx/F_cy -1,

If $\sigma$ _yy > 0, MS= $\sigma$ _yy/F_tu-1; if $\sigma$ _yy < 0, MS= $\sigma$ _yy/F_cy -1,

MS= $\tau$ _xy/F_su -1

MS =F_scrit/ $\tau$ _xy -1; F_scrit = $\pi$ ²K_s * [E/(12*(1- $v$ ²)]*(t/b)², k_s = 5.35+0.2*b²/Rt,

• Orientation Review Tool material orientation updates. Numerous corrections to material orientations have been made in the OptiStruct, Radioss, Nastran, Abaqus and ANSYS profiles.
• Material orientation by curve for solid elements in OptiStruct and ANSYS profiles. A local system per element is now generated to adequately capture curved orientations.
• Detailed thickness with layers visualization in OptiStruct, Radioss, Nastran and Abaqus profiles. Previously, composite layers were shown if no ply-based template property was assigned, or an unrelated shell property was assigned.