Abstract

This study presents fatigue strength assessment of the trimaran platform by the spectral approach. Spectral fatigue calculations are based on complex stress transfer functions established through direct wave load analysis combined with stress response analysis. In this study, ANSYS software with 3 dimensional linear sea-keeping code AQWA is used to compute frequency response functions of the vessel at zero forward speed. Finite element analysis of global trimaran structure is performed in ANSYS software utilizing hydrodynamic wave loads. Hot spot stress approach is used to compute stress transfer functions of the selected critical details. A MATLAB program, based on direct calculation procedure of spectral fatigue is developed to calculate total fatigue damage using wave scatter data of North Atlantic. Damage incurred during individual heading direction is also calculated and presented by means of polar diagrams to study its contribution towards cumulative fatigue damage.

Keywords:

Finite element, hot spot, spectral fatigue, stress response, trimaran,

References

Competing interests

The authors have no competing interests.

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Copyright

The authors have no competing interests.