22.2.2 Infinite element library

**Products: **ABAQUS/Standard ABAQUS/Explicit ABAQUS/CAE

Plane strain solid continuum infinite elements

CINPE4 | 4-node linear, one-way infinite |

CINPE5R^{(S)} | 5-node quadratic, one-way infinite |

Plane stress solid continuum infinite elements

CINPS4 | 4-node linear, one-way infinite |

CINPS5R^{(S)} | 5-node quadratic, one-way infinite |

3-D solid continuum infinite elements

CIN3D8 | 8-node linear, one-way infinite |

CIN3D12R^{(S)} | 12-node quadratic, one-way infinite |

CIN3D18R^{(S)} | 18-node quadratic, one-way infinite |

Axisymmetric solid continuum infinite elements

CINAX4 | 4-node linear, one-way infinite |

CINAX5R^{(S)} | 5-node quadratic, one-way infinite |

2-D acoustic infinite elements

ACIN2D2 | 2-node linear, acoustic infinite |

ACIN2D3^{(S)} | 3-node quadratic, acoustic infinite |

Plane stress and plane strain solid continuum elements: *X*, *Y*

2-D acoustic elements: *X*, *Y*

3-D solid continuum and acoustic elements: *X*, *Y*, *Z*

Axisymmetric solid continuum and acoustic elements: *r*, *z*

Normal directions are not specified at nodes used in acoustic infinite elements; they will be computed automatically. See “Infinite elements,” Section 22.2.1, for details.

For two-dimensional, plane strain, and plane stress elements, you must provide the thickness of the elements; by default, unit thickness is assumed.

For three-dimensional and axisymmetric solid elements, you do not need to specify a thickness.

For acoustic elements, you must specify the reference point in addition to the thickness.

Input File Usage: | *SOLID SECTION |

ABAQUS/CAE Usage: | Only acoustic infinite sections are supported in ABAQUS/CAE. |

Property module: |

Stress, strain, and other tensor components

No output is available from ABAQUS/Explicit for infinite elements. Stress and other tensors (including strain tensors) are available from ABAQUS/Standard for infinite elements with displacement degrees of freedom. All tensors have the same components. For example, the stress components are as follows:

S11 | direct stress or radial stress for axisymmetric elements. |

S22 | direct stress or axial stress for axisymmetric elements. |

S33 | direct stress (not available for plane stress elements) or hoop stress for axisymmetric elements. |

S12 | shear stress or shear stress for axisymmetric elements. |

S13 | shear stress (not available for plane stress, plane strain, and axisymmetric elements). |

S23 | shear stress (not available for plane stress, plane strain, and axisymmetric elements). |