NISA/ENDURE
Log (Life) contours on crank shaft
NISA-ENDURE is a general purpose software for
analyzing the fatigue performance and fracture
characteristics of engineering structures and
components. The program is completely menu-driven
and extremely user friendly. It employs the latest theories
to determine crack initiation and crack propagation lives
for fatigue analysis and to evaluate fracture parameters.
ENDURE provides various analysis models and allows
different types of load and material data descriptions
such as those encountered in aerospace, offshore, and
automobile structures. ENDURE is directly interfaced with
NISA II and other commercially available finite element
LOADING
- Peak-Valley/ Range-Mean matrix type
- Cumulative exceedence curves
- Sequential variable amplitude histories/ Variable amplitude
spectra
Probabilistic Representation
- Power Spectral Density (PSD) for random load representation
Counting Methods available:
Peak, Level-Crossing, Range, Range-Mean and Rain-flow
2x2 PSD Load Matrix for a Control Arm |
Fatigue Life Contrours for a Control Arm |
STRESS INPUT
- Manual input during preliminary design
- Direct interface with static and dynamic analysis results of
NISA II
- Input of dynamic effects including random vibration
Log (Life) contours on traction motor |
MATERIAL DATA
- Access to ready to use material data files for popular materials
- User defined material data input
- Low cycle fatigue properties
- Crack propagation properties
- Work with multi-material combinations for crack initiation
problems
CRACK INITIATION
- Multi-channel and multi-loadcase capabilities
- Complex multiaxial stresses and out-of-phase fatigue
simulations
- Stress-Life (S-N) or Strain-Life (e-N) correlation Memory effects
& nonlinear material response
CRACK PROPAGATION
- User supplied 'a' vs. 'K' correlation using fracture analysis
results
- Built-in crack configurations
- Crack growth models: Paris, Forman, and Collipriest
- Crack closure models: Elber
FRACTURE
- Single and/ or mixed mode fracture analysis
- Quarter-point isoparametric elements around crack tip for
accuracy
- Stress Intensity Factor (SIF) estimation
- Crack Tip Opening Displacement (CTOD)
- Virtual Crack Extension (VCE)
- Strain Energy Release Rate (SERR) estimation
- J-Integral
- Virtual Crack Closure Integral (VCCI)
- Modified Crack Closure Integral (MCCI)
- Equivalent Domain Integral (EDI)
- Path independent J-Integral under elastic and elasto-plastic
conditions (Delta J)
- Non-Linear elastic multi-load step analysis
- Material non-linear elastic analysis (EPFM)
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NISA/ENDURE