Practical Introduction into FEM I at RWTH Aachen

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APDL Code example

ET ITYPE Ename KOP1, KOP2, KOP3

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Ansys Parametric Design Language (APDL)

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Why do we need to add fixed rotation at a beam problem? (Session 2, task 1)

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Beam

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*get crossection, SECP, matid, PROP, AREA

ET, matid, LINK180

SECTYPE, matid, LINK

SECDATA, crosssection

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Link Element

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Plane stress

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Tau_xy

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Plane Strain

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Plane Element

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Keyoptions

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APDL Code Example

SECDATA, VAL1, VAL2, ..., VAL12

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Exemplary flashcards for Practical Introduction into FEM I at the RWTH Aachen on StudySmarter:

Practical Introduction into FEM I

APDL Code example

ET ITYPE Ename KOP1, KOP2, KOP3

  • Defines a local element type from the element libary
  • ITYPE: Arbitary (willkürlich) local element type number
  • ET: Indicator what is implemented
  • Ename: Element name (e.g Beam 188)
  • KOP1, KOP2, ...Keyoptions, changing element behaviour

Practical Introduction into FEM I

Ansys Parametric Design Language (APDL)

  • Imperativ scripting language of Ansys
  • Most actions can be accessed via GUI-tools

Practical Introduction into FEM I

Why do we need to add fixed rotation at a beam problem? (Session 2, task 1)

Although the problem should not rotate due to nomarical inaccuracies in the solution process a rotation can occure

Practical Introduction into FEM I

Beam

  • One Dimensional line element 
  • Based on Timoshenko beam theory which includes shear deformation effects
  • DOF: UX,UY, UZ ,Rotx, Roty, Rotz
  • Linear, quadratic, cubic

Practical Introduction into FEM I

*get crossection, SECP, matid, PROP, AREA

ET, matid, LINK180

SECTYPE, matid, LINK

SECDATA, crosssection

  • *get: reads cross section area from geometry with ID matid and stores it into user defind variable crosssection
  • matid is a variable containing the geometry ID
  • ET: changes the element type ot the geometry with the ID matid to LINK180
  • SECTYPE: Associates the section the type "link" (this controls what we need to give using SECDATA)
  • SECDATA: Assigns cross section are stored in the variable crosssection

Practical Introduction into FEM I

Link Element

  • One- dimensional line element
  • Stab bzw. Seil
  • to model trusses, sagging cables, links, springs
  • DOF: UX, UY, UZ
  • Force only along the axis 
  • Only compressing an pulling
  • No graphic interface for Link --> needs to be enabled using APDL

Practical Introduction into FEM I

Plane stress

  • All stresses orthogonal to a specific plane are zero
  • assumtion used, if a thin strcutre like a triangle ruler is considered
  • plane x-y: sigma_z = tau_yz = tau_xz = 0
  • --> gamma_xz = gamma_yz =0
  • epsilon_z os generally not cero, eliminated out of the equation system

Practical Introduction into FEM I

Tau_xy

  • x: stress vector is in plane with normal vector on direction of x
  • y: stress vector is in direction of y-axis

Practical Introduction into FEM I

Plane Strain

  • Plane strain means that all strains orthogonal to a specific plane are zero
  • Assumption of plane strain is often used, if a thik structure like a steel beam is considered
  • For plane x-y: Epsilon_z = 0 = gamma_xz = gamma_yz = 0
  • --> tau_xz = tau_yz = 0
  • sigma_z is in general not zero. Its just eliminated out of equation system

Practical Introduction into FEM I

Plane Element

  • Two dimensional element
  • Linear element 4 - nodes
  • Quadratic element with 8 - nodes
  • DOF: UX, UY (No bending, no z - direction)
  • Keyopt: Plane stress, axisymetric, plane strain

Practical Introduction into FEM I

Keyoptions

  • Switches for turning on specific element options
  • Every element has different keyoptions, one needs to check Anys documentation for details
  • Some Keyoptions are built into the Ansys workbench GUI
  • Some need to be included via APDL

Practical Introduction into FEM I

APDL Code Example

SECDATA, VAL1, VAL2, ..., VAL12

  • Describes geometry of a section
  • VAL1, VAL2 provides geometry information to a section (e.g. cross section)


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