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Weld Fatigue Analysis in ANSYS using ANSYS Fatigue Module

'Weld Fatigue Analysis in ANSYS using ANSYS Fatigue Module'
Weld Fatigue Analysis in ANSYS using ANSYS Fatigue Module Alexander Kielland platform accident during 1980 Fatigue Analysis in ANSYS Scope of presentation ? ANSYS fatigue overview –ANSYS nCode DesignLife? –Fatigue module in ANSYS Workbench –ANSYS (classic) post1 Fatigue Module User calculated fatigue criteria plotted using ANSYS post1–User calculated fatigue criteria plotted using ANSYS post1 ? Weld fatigue methods that can be related to WB Fatigue Module ? Short notes on sub-modeling technique ? Live demonstration of complete work flow from CAD to analysis results using ANSYS WB Fatigue Module ANSYS®nCode DesignLife? Integrated within ANSYS Workbench environment to provide a leading solution for advanced fatigue analysis. ANSYS Fatigue Module ? Stress life fatigue evaluation ? Strain life fatigue evaluation ANSYS post1 Fatigue Module How ANSYS Calculates Fatigue ? The ANSYS fatigue calculations rely on the ASME Boiler and Pressure Vessel Code, Section III (and Section VIII, Division 2) for guidelines on range counting, simplified elastic-plastic adaptations, and cumulative fatigue summation by Miner's adaptations, and cumulative fatigue summation by Miner's rule. User calculated fatigue criteria ? User calculated fatigue criteria plotted using ANSYS post1 Fatigue assessment of welds There are a number of methods available for fatigue assessment of welded joints ? Nominal stress method ? Hot Spot method (geometrical stresses)Hot Spot method (geometrical stresses) ? Fracture mechanics analysis ? Effective Notch Method (notch stresses) – Can be used directly with ANSYS Fatigue Module when the appropriate fatigue data is input Fatigue assessment of welds Effective notch stress method (R1MS) ? This method consider the notch stresses in concentrated areas and require correct modeling of weld seam. = + Total stress MembraneBending + Non linear peak stress Fatigue assessment of welds Effective notch stress method (R1MS) ? For use with solid models only ? Both weld root and weld “toe” is considered. The method is applicable for plate thicknesses larger than 5 mm? The method is applicable for plate thicknesses larger than 5 mm ? Misalignment, skewness of plates or other geometric imperfection must be modeled since it is not in the fatigue strength class. Fatigue assessment of welds Effective notch stress method (R1MS) ? A radius of 1 mm is introduced at weld root or weld “toe” Radius = 1 mm ? Max of principal stresses are used, but stresses should be perpendicular to the weld joint. ? Fatigue evaluation is performed according to fatigue strength class FAT 225 according to IIW (International Institute of Welding). Fatigue assessment of welds Sub modeling technique ? Effective Notch stress method require a fine mesh to capture the notch peak stresses which makes it virtually impossible in most practical situations to analyze large structures with all details required. ?The solution to this is to use sub modeling technique where a small but detailed model ca
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