Endure

NISA-ENDURE is 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 programs.

 

LOADING

  • Peak-valley/range-mean matrix type
  • Cumulative exceedance 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

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


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 and 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)
  • Nonlinear elastic multi-load step analysis
  • Material nonlinear elastic analysis (EPFM)
Amstrup-Engineering |  mail@a-engineering.dk | +45 61 33 78 07