LIMIT Strength Assessment Software

From Stress to Safety…

LIMIT is a software tool for evaluating static and fatigue strength assessments of metal structures. Based on the already calculated stresses according to your load cases, you need to know your permissible static and fatigue limit for your structure.

The assessments of the base material, and in case of welded structures, the heat affected zone (HAZ) and the weld itself, are based on stress results generated using standard commercial FEA codes.


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Preview of Limit Strength Assessment Software
Screenshot of Strength Assessment Software Interface

Screenshot of LIMIT Strength Assessment Software Interface

LIMIT calculates the permissible stresses locally for each element, including various effects like:

  • stress gradients,
  • surface treatments,
  • weld types,
  • mean stresses,
  • load case combinations,
  • service lifetime, etc.

The resulting safety values provide the information you really need to improve your design quickly and cost effectively. In welded structures, critical areas in terms of strength often do not coincide with areas of increased stresses, since the static and fatigue strength strongly depends on the weld geometry and the local loading conditions.

Learn more about our Strength Assessment Software

Workflow

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CAE/Solver/Viewer

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FEA Interfaces

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Assessment Types

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Assignment Types

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Stress Concepts

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Assessment Points in Welds

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Sensor Technology

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Load cases

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Report Generation

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Hardware Requirements

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Release Information

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Codes & Guidelines

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Workflow

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Engineering Services

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Your Benefits with LIMIT stress evalutation

  • fast and efficient assessments of welding seams and base material
  • various interfaces to classic FEM tools
  • graphical user-interface (GUI) enables shorter trainings
  • structural (hot spot) stress for solids
  • individual customization possible
  • identification of all critical positions in the structure with respect to static failure or fatigue

Factor of safety / degree of utilization of your design

Many engineers face the challenge of deciding whether a structure can withstand the given loads or not according to a relevant design code . Finite element analysis is a common tool for calculating the stress response of a given structure.

However, the remaining question is:

“What is the factor of safety (FoS) or the degree of utilization (DoU) of your design?”

To answer this question, you have to calculate the FoS or DoU respectively.

Factor of Saftey - Fatigue Assessment Software

LIMIT Software: Strength Assessment Examples

The highest stresses in the support frame are calculated in the prefabricated C-profile on the left hand side. However, the permissible stresses in this area correspond to the base material, which is 235 MPa for the used steel grade S355 for a reverse bending loading.

The areas in the center of the picture, showing green colors, indicate lower stresses. The allowable stresses in this one-sided fillet weld are only 36 MPa, which corresponds to only about 10% of the yield strength of the base material!

Stress Amplitudes - Strength Assessment Software
Example

If you calculate your FoS or DuO individually for each region of your model, the picture of changes dramatically! The area with the one-sided fillet weld will fail below 2*106 load cycles, while the base material will remain save as shown in the picture below.

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