NDJ Sustainable
Engineering,  LLC

Fracture Mechanics

We provides LEFM and EPFM analysis services for companies that require advanced fracture mechanics skills to perform structural safety assessment.

Advanced Fracture Mechanics

Implicit flaw method, explicit flaw method, natural flaw shape, flaw tolerance, net-section collapse and J-T analysis, etc.

    Explicit Crack Growth Methods

    Explicit methods include displacement extrapolation method and domain integration methods. These methods simulate the cracks directly in the finite element model to accommodate the interaction of the crack, the geometry, and the loading. This interaction can be especially important when distinguishing between cracks driven by primary global loading, such as pressure, dead weight, and seismic loading, and secondary loading, such as thermal or residual stresses.

  • NDJSE, LLC is specialized in finite element modeling for structure or component with flaw indications. We provide analysis services using advanced and high quality meshing to model the crack in the structure or component for accurate crack tip behavior analysis.
  • We are expert at fracture mechanics analysis and actively involved in the state-of-the-art methodology development.
  • We develop our own in-house software for 3D mesh generation for fracture mechanics analysis that connects to commercial solver like ABAQUS and ANSYS, and research code such as Warp3D.
  • We have experience in performing individual fatigue crack growth, stress corrosion cracking, and the coupling of these two using explicit methods.

    Implicit Crack Growth Methods

    In the implicit crack growth methods, the stress intensity factors are calculated using the stress distribution at the crack location in the absence of the crack. This method does not account for potential interaction between the geometry and the loading that is driving the crack. Instead, the crack size and the stress at the crack face are two important factors.

  • Traditional polynomial methods
  • Weight Function methods
  • We have experience in performing individual fatigue crack growth, stress corrosion cracking, and the coupling of these two using implicit methods.

    Flaw Tolerance Assessment

  • ASME Code Section XI Appendix C analysis
  • J-Tearing evaluation for ductile materials
  • We have extensive experience in performing allowable flaw calculations based on ASME Code requirments.
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Application Field

  • Solar Energy
  • Transportation System
  • Nuclear Energy
  • Oil/Gas Industry
  • Mechanical System
  • Civil Engineering