SACS Fatigue Ultimate

Design for safety and reduce offshore structural failure risks

SACS Fatigue lets you design for safety by analyzing the effects of cyclic stresses on your offshore structures. A fatigue life evaluation and redesign software, SACS Fatigue provides you with a broad range of offshore-specific wind, wave, spectral, time history, and deterministic analysis capabilities to help you  minimize the risk of failure from cyclic loads. Whether performing fatigue damage assessments for new or existing designs, you can ensure compliance with offshore codes by applying automated, fully inclusive, interactive fatigue redesign and analysis.

SACS Fatigue Modules

SACS Fatigue comes in various add-on modules for SACS Offshore Structure, SACS Offshore Structure Advanced, or SACS Offshore Structure Ultimate.

The following SACS Fatigue modules are available, so you can choose which module is best for you:

• SACS Fatigue includes offshore-specific calculations for complex, variable stress concentration factors, making it fast and easy to comply with design codes.
• SACS Fatigue Advanced – Dynamic Response integrates analysis of dynamic forces including spectral.
• SACS Fatigue Advanced – Wave Response helps save time and minimize risk of multiple modeling environments with integrated wave fatigue analysis.
• SACS Fatigue Ultimate expands on SACS Fatigue by adding integrated analysis of dynamic forces—including spectral and extreme wind fatigue—helping you save time and avoid errors. It also includes integrated wave fatigue analysis.

Assess fatigue life

SACS Fatigue provides a variety of analyses so you can determine fatigue life from all angles. Analyze the life of your offshore structures using full non-linear soil and structural analysis, dynamic spectral/time history fatigue analysis, spectral wind fatigue calculations that include gust effects and spatial correlation and damage assessments for wave action over time.

Automate offshore structural workflows

Customizable templates within a common structural model make it easier to manage multiple analyses. Automatically pass data from one analysis step to another using industry-standard methodologies. These automated workflows simplify the management of large and complex models, which encourages your team to explore more design options.

Comply with offshore design codes

Ensure you meet international codes by using automated joint meshing or predefined industry SCF rules to calculate complex variable stress concentration factors. Assess wind and wave fatigue using standard S-N curves or ones you define yourself.

Optimize tubular joint fatigue life

Refine your structures to reduce fatigue with interactive redesign of any joint by variation of structural data and fatigue parameters. Take time-history analysis into account when assessing joint fatigue for redesign.

Technical Capabilities

• Deterministic, Spectral, Time History Fatigue Analysis
• Stress concentration factors may be automatically evaluated based on state-of-the-art theories or input by the user
• Program calculated stress concentration factors may be based on API or DNV recommendations
• Automatic redesign of chords and braces may be done to determine required joint can and brace stub thicknesses
• The user may specify fatigue analysis for selected critical joints, excluding other joints from the analysis
• Upper and/or lower limits on SCF’s may be specified by the user
• Non-tubular members, plates and shells can be included in or omitted from the fatigue analysis
• SCF’s can be overridden at the joint, group, member, or connection levels
• API, AWS, and NPD fatigue failure (S-N) curves are built into the program. The user may, however, define his own S-N curve
• The program automatically determines if a connection is K, T, or Y, KT, or X and calculates the SCF’s appropriate to that type. The user may, however, force the connection to use the SCF for any specified joint type. For example, a K brace can be forced to have the SCF of an X.
• Stress ranges may be used based on dynamic or static analyses.
• The program can calculate stress ranges based on the difference between stresses for maximum and minimum base shears, overturning moment, or uplift forces
• Calculate stress ranges based on the difference between maximum stresses for various positions of a wave as it passes through the structure
• Stress ranges may be calculated for waves of arbitrary height by automatic interpolation between values for a few waves of height specified by the user
• Spectral fatigue analysis may be based on either Pierson-Moskowitz, JONSWAP (Joint North Sea Wave Project), Lewis and Allos JONSWAP, Ochi-Hubble or user defined wave spectra
• Wind fatigue analysis may be based on wind spectra
• Interactive Fatigue extract file for joints with fatigue life less than the design life can be created automatically
• Development of fatigue environment wave spectra from input scatter diagram information
• Predict propagation of cracks
• Check cross-section changes for segmented sections as in-line members
• Allows expanded user defined S-N data including thickness correction and endurance limit
• Includes SCF override options for wide flanges and plate girders