Altair HyperLife 2023.1 Release Notes

• Key enhancements to spot weld fatigue analysis.

Support of transient loading for spot weld fatigue

Spot weld fatigue with 1D elements is extended to transient loading. The feature supports both .h3d and .op2 result formats as input.

Contouring sheet damage in spot weld fatigue

When SPTFAIL = ALL in material assignment, life and damage results of both sheets and nugget will be reported separately.

Default Stress Life curve for spot weld fatigue

HyperLife supports the default amplitude-based SN curve for spot weld fatigue at stress ratio equal to 0.0.

Rainflow and Damage Matrix for sheets and nugget in spot weld fatigue

HyperLife supports display and export of Rainflow matrix for sheets and nuggets separately.

• Rainflow output (RFOUT) of spot weld fatigue to report corrected stress amplitude

  Rainflow file from spot weld fatigue analysis will also output corrected stress amplitude along with stress amplitude, mean stress and damage for every cycle.

• Contour of life/damage will be specific to the SPTFAIL selection in spot weld fatigue.

The following known issues will be addressed in a future release as we continuously improve performance of the software:

• Inconsistency in reporting damage/rainflow matrix for Brown-Miller damage model in Strain-Life multiaxial analysis.

• The issue concerning sheet damage with spot weld fatigue modeled with hexahedron (hexa) elements is resolved.
• Wrong warning shown when beam elements from OP2 results are used for spot weld fatigue is resolved.
• The issue pertaining to zero results on using Brown-Miller damage model in Strain-Life multiaxial analysis is resolved.
• User warning reported when sheet thickness or nugget diameter is set to zero in spot weld fatigue.