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01:36 Universität Kassel, Institut für Mechanik Silent film 2011

Risswachstum in einer 3-Punkt-Biegeprobe mit Bohrung

Risspfade in einer 3-Punkt-Biegeprobe mit Bohrung werden mit der Software ABAQUS, einem zusätzlich implementierten Post-Prozessor (J-Integral) und einer Neuvernetzungsstrategie berechnet. Der Einfluss von drei verschiedene Bohrungspositionen auf den Risspfad wird untersucht.
  • Published: 2011
  • Publisher: Universität Kassel, Institut für Mechanik
  • Language: Silent film
00:09 Universität Kassel, Institut für Mechanik Silent film 2014

Simulation of crack propagation at a three cracks system

An interaction integral technique for multiple cracks systems is implemented as a post processor into the commercial FE code ABAQUS. In combination with automatic geometry reconstruction and intelligent remeshing procedures, this tool represents the foundation of the crack path simulation. Crack growth is simulated by incremental extensions of the crack faces based on crack growth and deflection criteria. The interaction-integral enables the accurate calculation of stress intensity factors considering multiple cracks and strongly curved crack faces. A numerical specimen exhibiting a three cracks system with a hole is investigated. The specimen's material is chosen to be an aluminum alloy Al-7075 with Young’s modulus E=72000 MPa, Poisson’s ratio nu=0.33, the exponent of Paris’ crack propagation law p=1.34 and the critical fracture toughness KIc=23.9 MPa(m)^(0.5). The numerical crack extension parameter is da=0.25 mm. The external loading u0 is selected to be a constant displacement u0=u2=-0.158 mm.
  • Published: 2014
  • Publisher: Universität Kassel, Institut für Mechanik
  • Language: Silent film
00:07 Universität Kassel, Institut für Mechanik Silent film 2014

Simulation of crack paths at a two cracks system

The interaction integral technique for multiple cracks systems is implemented as a post processor into the commercial FE code ABAQUS. In combination with automatic geometry reconstruction and intelligent remeshing procedures, this tool represents the foundation of the crack path simulation. Crack growth is simulated by incremental extensions of the crack faces based on crack growth and deflection criteria. The material is chosen to be an aluminum alloy Al-7075 with Young’s modulus E=72000 MPa, Poisson’s ratio nu=0.33, the exponent of Paris’ crack propagation law p=1.34 and the critical fracture toughness KIc=23.9 MPa(m)^(0.5). The numerical crack extension parameter is da=0.25 mm. The external loading u0 is selected to be a constant displacement u0=u2=0.1 mm.
  • Published: 2014
  • Publisher: Universität Kassel, Institut für Mechanik
  • Language: Silent film
00:17 Universität Kassel, Institut für Mechanik English 2014

Crack path prediction in rolled aluminum plates with fracture toughness orthotropy

The J-integral has been implemented as a post processor into the commercial FE code ABAQUS. An automatic geometry reconstruction and intelligent remeshing procedure is applied. The crack tip is shifted by constant increments da. The J-integral is used to determine crack tip loading quantities such as stress intensity factors or the energy release rate. Crack paths are predicted applying a modified maximum energy release rate approach accounting for the fracture toughness orthotropy in rolled plates of aluminum alloy Al-7075-T651 where the anisotropy of elastic constants is negligible. A specimen with crack and hole is investigated. Young's modulus is E = 72000 MPa and Poisson's ratio is nu = 0.3. The vertical distance between crack and the holes center is e0 = 18 mm.
  • Published: 2014
  • Publisher: Universität Kassel, Institut für Mechanik
  • Language: English
00:10 Universität Kassel, Institut für Mechanik English 2014

Crack path prediction in rolled aluminum plates with fracture toughness orthotropy

The J-integral has been implemented as a post processor into the commercial FE code ABAQUS. An automatic geometry reconstruction and intelligent remeshing procedure is applied. The crack tip is shifted by constant increments da. The J-integral is used to determine crack tip loading quantities such as stress intensity factors or the energy release rate. Crack paths are predicted applying a modified maximum energy release rate approach accounting for the fracture toughness orthotropy in rolled plates of aluminum alloy Al-7075-T651 where the anisotropy of elastic constants is negligible. A specimen with crack and hole is investigated. Young's modulus is E = 72000 MPa and Poisson's ratio is nu = 0.3. The vertical distance between crack and the holes center is e0 = 16 mm.
  • Published: 2014
  • Publisher: Universität Kassel, Institut für Mechanik
  • Language: English
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