• TIME HISTORY FATIGUE ANALYSIS IN SACS

    Hi, I would like to perform time history fatigue analysis. Is there any sample or procedure on how to perform the analysis in SACS? in case yes, please feel free to send it to my email. ( ali_aidibi_94@hotmail.com ) Many thanks in advance. Best…
  • Fatigue analysis

    Hi I am working on fatigue analysis of jacket structures. As per the SACS doement as below "3.5.4 Using Stresses at the Chord Face By default, member hot spot stresses at the modeled end of the brace are used for fatigue calculations. For members…
  • Pile fatigue

    Hello I am doing pile fatigue check based on pil.csf file (obtained from PSI analysis). Pile is defined as concentric tubular section so that grout is done in between the tubular. in FTOPT line grouted memeber option is selected and in FTOPT2 ,colum…
  • scatter diagram for fatigue analysis

    I have scatter diagram with total number of occurrences 175320 waves. It is indicated a note that these records are " Hourly event number of occurrence - reference period: 20 years". My question, what does this note mean? should we multiply the scatter…
  • SACS Fatigue Analysis Error

    Hi Users, I am getting the following error when I run the spectral fatigue analysis file: SEASTATE FILE 1 HAS 60 LOAD CASES WHERE POSTFILE 1 HAS 1440 LOAD CASES Can anyone explain this error and what must have gone wrong?
  • Significance of mesh intensity and target plate length, and the relationship between the two variables

    Hi everyone, I would like to inquire what is the significance of mesh intensity in joint meshing. In the Utilities manual, section 3.2.3, the following highlighted statements are made (see screenshot below): Which lead to these questions: What…
  • SACS / spectral fatigue analysis

    hi all , while generating the seastates (dynamic transfer function) on a cantilever inside the water it was noticed that there is bulb at the early frequency. any ideas why this happens and thanks
  • Tow Fatigue with SACS

    Hi there. I need to perform Fatigue analysis for sea transportation in order to understand this calculation I started studying this guide "Tow Fatigue with SACS". I ran into a problem, if I understood correctly this formulas => have to calculate these…
  • RAO Spectral Fatigue warning [Total Life ratio = 2.00]

    Hi, When we run RAO spectral fatigue we have warning message like below. What is the cause and consequence of this warning? We didn't have this warning before when we had 16 headings (22.5 deg increment) in RAO and 16 wave scatters in ftginp. Scatters…
  • stress range and cycle counting

    Dear all I'm working on a spectral analysis for a leg member. An I extract the nominal stress range and cycle counting for a member, say, by using St-cyl-command ? the reason is that, the member has weld detail joints which can't be checked within…
  • Spectral Fatigue

    Hello everyone, Could you please clarify the significance of the resulting RMS value when we run the spectral fatigue analysis? RMS value = Sqrt(m0) or RMS = 2 Sqrt(m0) ??? Thanks!
  • Spectral Wind Fatigue

    Hai, I have run the analysis for Spectral wind fatigue. But there are error occur during analysis. This is my dynamic response input file Can someone help me on this.
  • Fatigue, Is the SN Curves of DNVGL-RP-C203 are equivalent to NORSOK curves

    Dear all, Is the SN Curves of DNVGL-RP-C203 are equivalent to NORSOK curves listed below: Thanks and Regards, SWARUP Selvaraj.
  • Center of Damage Utility Version 11.2.0.15

    Dear all, I am trying to use Center of Damage Utility for calculate COD wave height and time period. In the fatigue input file, I could only input 11 wave heights in SCWAV card. Can anyone explain how to input more than 11 wave heights in wave scatter…
  • ERROR - 113 NOT A RECOGNIZABLE LOAD CASE

    Any body can help me to solve my fatigue running? I have check it many times, but I don't know what's wrong with my SACS file
  • Request for SACS Wind turbine module example.

    I'm Mr.Gong who works at Zentech Engineering in Seoul, South Korea. We would like to do Fatigue and Strength Check using the SACS Wind turbine module from GH-Bladed results. While browsing the example, I found an example of the following link: https…
  • SACS - Strange SCF of Tubular Connection with Ring Stiffeners

    Dear Sir, I am curious about SCF calculation for tubular connection with ring stiffeners. It is mentioned that Smedley and Fisher (1991) formula is applied. The R-factor calculated by using the formula mentioned above looks ok. However, the final…
  • Effective thickness of Grouted Joint in Fatigue Analysis

    Dear Sir, I'm running a spectral fatigue analysis for a platform with grouted legs. These are my section input for my joint cans at leg SECT LEGCAN TUB 111.765.08091.4403.810 SECT LEGCAN1 TUB 111.765.50091.4403.810 SECT LEGCAN2 TUB 111.766.00091…
  • Fatigue Analysis Force-Time history

    Hi, I try to conduct fatigue analysis by using SACS. With very useful answer in the communities, fatigue analysis was successful. However, I also want to conduct a fatigue experiment for some members based on results from fatigue analysis by SACS…
  • RE: Can we use load RAOs to generate common solution file with inertia loads for fatigue analysis. If yes, how it can be done?

    Anupam, Let's first look at the input requirements for a tow fatigue analysis: Fatigue Input File (ftginp) Common Solution File (saccsf) Seastate Input File or Tow Input File (towinp) The fatigue input file defines the fatigue cases which…
  • RE: USER DEFINED SCF FOR TUBULAR CONNECTION

    C.karthikeyan, You can specify SCF overrides in a variety of ways in your fatigue input file, the most common being the SCF line and the CONSWF for plate girders. The SCF line can be used to override SCF's for all plate girder connections whereas the…
  • RE: How to perform spectral fatigue analysis using SACS

    Stephen, You need to do a Tow Fatigue analysis. Tow Fatigue will analyze fatigue damage of a structure by generating transfer functions using motion RAO's (Velocity, Motion or Acceleration RAO's) and combining those transfer functions with the wave…
  • RE: Wave spreading application

    Sanjay, That is not how the wave spreading works in SACS. When you select the wave spreading option, SACS will take the load cases from +- 90 degrees from the fatigue load case direction and factor those load cases using cos^n(theta) so that total equivalent…
  • RE: SACS - Morison Drag Linearisation for Frequency Domain Analysis

    Kasiphon, The nonlinear drag component in spectral wave fatigue analyses is addressed by using constant steepness waves when generating transfer functions. See Section 16.7.2.3 of ISO 19902. Regards, Geoff
  • RE: SACS Broad-Band Random Process

    Kasiphon, The broad band option in SACS utilizes the equations presented in Application of computers in fatigue analysis ( Dirlik 1985). Dirlik uses an empirical formula to calculate the rainflow range density for various sea-states including double…