Fracture Workbench - Defect Assessment

Defect Assessment Fracture WorkbenchBEASY Crack modelling technologies provides quick and accurate tools to:

  • Add cracks to models
  • Predict stress intensity factors
  • Predict crack growth rate and direction
  • Predict residual strength

The BEASY Fracture workbench simplifies and automates the difficult task of creating a mesh to represent a crack in a complex 3D model. The user selects the type and shape of crack from a library of crack shapes, identify its location on the model and the software does the rest.

Automatic Crack Growth

BEASY not only provides stress intensity data but can also predict how the crack will grow. Remeshing is automatically performed by BEASY where necessary. The procedure is highly automated with the crack wizard guiding the user. Simply define the crack growth model, select the material properties and the loading history and BEASY does the rest.

Fracture Mechanics

BEASY is based on Boundary Element Technology which has significant benefits when solving fracture mechanics applications. The technology can more accurately represent the high stress fields near the crack front and the surface only mesh simplifies the tasks associated with crack modelling and mesh generation as the crack grows. The software supports crack modelling in two dimensional and three dimensional structures. Although BEASY crack models are based on boundary element technology it fully integrates with Finite Element Models.

Stress Intensity Factors

BEASY supports mixed mode crack growth and computes Ki, Kii and Kiii. There are options to select different methods of computing the SIF including J Integral and Crack Opening Displacement (COD).

Residual Stresses

Crack growth through residual stress fields can be simulated. The residual stress fields can be obtained from FEM models.

Contact Simulation

BEASY provides a powerful modelling tool to predict the critical stresses and slip motion of components in contact including closed crack faces to provide accurate prediction of contact stresses, slip and wear data prediction. BEASY's nonlinear contact algorithm automatically computes the change in position of the contact surfaces and the resulting stress redistribution.

Predicting the behaviour of cracks under compressive loading provides an important analytical component and is helpful in understanding the fretting fatigue behaviour of fracture critical components.BEASY Defect Assessment Logos

Crack Growth

Fracture Defect Assessment CriteriaBEASY supports both 2D and 3D crack growth simulation including mixed mode crack growth direction calculation. Crack growth direction and rate are computed at locations along the crack front to allow the crack freedom to grow in the direction dictated by the loading and stress field. Multiple cracks can be simulated within the same model to consider Multiple Site Damage Scenarios.

Fatigue Criteria

Fatigue Crack Growth Criteria

The crack growth laws supported include:

  • Paris
  • Forman
  • Rhodes
  • NASGRO (2, 3, 4, 5)
  • Walker Chang
  • Vasudevan
  • Unigrow
  • Navarro (short cracks)
  • User defined tabulated da/dn

Retardation Models

Retardation Models

Retardation models can be used with selected growth equations to represent the effect of plasticity in the model.

  • Generalised Willenborg
  • Modified Generalised Willenborg
  • Walker Chang

Direction Criteria

Crack Growth Direction Criteria

  • Maximum Principal Stress (2D only)
  • Minimum Strain Energy Density
  • Multi-axiality (Q Plane) searching
  • Mode 1 growth

Database

Materials Database

  • NASGRO 2/3 databases (Over 360 materials are represented)
  • Ability to link to the NASGRO 4 & 5 database
  • Alternatively users can define their own material properties

Modeling

Crack Modelling

  • Single or multiple cracks
  • Embedded or edge cracks
  • Flat or curved cracks can be used
  • User defined cracks can be added to models
  • Crack used in BEASY are defined using dual boundary elements

Results

Fatigue Crack Growth Results

  • Stress Intensity Factors
  • Crack and model deformation
  • Crack and model stress field
  • Crack propagation path
  • Crack growth rate

Properties

Material Properties

  • Isotropic, linear elastic for 3D, 2D and axisymmetric
  • Isotropic, orthotropic and anisotropic linear elastic for 2D and 3D

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