fe-safe™ features

fe-safe™ can predict fatigue lives from a range of loading types:

• Single load-time history applied to a linear elastic finite element model
• Multiple time histories of loading superimposed in fe-safe™ (more than 4000 load histories can be applied)
• Sequence of FEA stresses (elastic or elastic-plastic, linear or non-linear)
• Modal superimposition
• PSD loading, block loading test programs, rainflow cycle matrices
• Effects of forming or assemble stresses can be include

fe-safe™ includes powerful simple-to-use batch command system, with on-line parametric variation for ‘sensitivity’ studies.
Standard analyses can be set up and saved for re-use.

Analysis Methods

fe-safe™ includes a wide range of analysis methods, all of which are included in the standard package:

• Strain-based multiaxial fatigue algorithms - axial strain, shear strain, Brown-Miller from FEA stresses, with a multi-axial Neuber’s rule and cyclic plasticity model
• S-N curve analysis including multiaxial fatigue using axial stress or a new Brown-Miller analysis formulated for use with S-N curves
• Dang Van multiaxial fatigue for high cycle design
• Plots of materials data including the effect of temperature, strain rate etc
• Advanced analysis methods for fatigue of cast irons
• Analysis of welded joints
• High temperature fatigue included as standard
• Analysis from elastic and elastic-plastic FEA stresses, linear and non-linear analysis
• Interfaces to ABAQUS (.fil & .odb), ANSYS (.rst), MSC.Nastran (.op2 & .f06), NX Nastran (.op2 & .f06), Pro/Mechanica (ASCII & binary), IDEAS (.unv), ADAMS, .dac, MTS .RPCIII (.rsp), BEASY, FEMSYS, CADFIX, Altair HyperMesh & Optistruct

UNIAXIAL AND CRITICAL PLANE MULTIAXIAL STRESS-LIFE AND
STRAIN-LIFE METHODS ARE INCLUDED AS STANDARD

Output

fe-safe™ outputs a wide range of results, in a single run:

• Contours of fatigue life show crack initiation site
• Contours of stress-based factors of strength for a specified design life – to show how much the stresses must be changed to prevent failure or to reduce material costs
• Probability of survival for specified lives (the ‘warranty curve’)
• Determines which loads need to be included in a test programme
• Contour plots of maximum stress during loading
• Detailed results – time histories of stresses and strain, Haigh and Smith diagrams, Dang Van plots and many more in order to explain the rationale behind the life prediction
• Damage at the critical location from each loading block – for example each road surface on a test track.

Materials database

• Comprehensive materials data-base of strain-life and S-N curve properties – may be extended by the user
• Materials approximation algorithm
• AFS database of strain-life fatigue properties for cast iron
• Materials support services including ‘materials searches’ and materials testing, including high temperature and thermo-mechanical testing

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