• The contact analysis in ADVENTURECluster is described here.
• There are two types of functions in the contact analysis: one is the bonded contact analysis, and the other is the slip contact analysis. The slip contact analysis includes two types of functions: one is the infinitesimal slip contact analysis, and the other is the finite slip contact analysis. In view of the calculation algorithm, those different types of the contact analysis functions depend on the linear constraint condition.
• Fig.1 shows a schematic configuration of the infinitesimal slip contact analysis and the finite slip contact analysis. In the infinitesimal slip contact analysis, the geometrical condition is determined by the initial configuration, and it is kept through the contact calculation process. Fig.1 shows a limitation of the applicability of the infinitesimal slip contact analysis. Although the finite slip is more accurate than the infinitesimal slip, users should note that the finite slip contact requires larger calculation time than the infinitesimal slip contact analysis.

  Fig.1 Infinitesimal and finite Slip

  (a) Problem Setting	(b) Infinitesimal Slip Contact	(c) Finite Slip Contact

• In the contact analysis, two surfaces possible to contact are needed to specify as a contact pair. One of the contact pair is called a master surface, and the other is called a slave surface. The nodal point on the master surface is called a master node, and that of the slave surface is called a slave node. Furthermore, the intersection point of the perpendicular line to the master surface from the slave node and the master surface is called an anchor point. The most basic condition of the contact analysis is given as follows:
  • The slave node does not pass through the tangent plane that includes the anchor point.
  • The anchor point and the slave node transmit the force each other.
• With the bonded contact analysis, the DOFs of the slave nodes and the anchor points are tied completely. Thus, the contact force acts in the tensile direction, the compressive direction or the shearing direction.
• With the slip contact analysis, the iteration procedure is briefly described as a process that satisfies the following conditions:

  Fig.2 Slip Contact Analysis

  • No penetration
  • No tensile force
• The infinitesimal slip contact and the finite slip contact conditions are constructed by the following conditions on top of the above conditions:
  • Infinitesimal slip contact (See Fig.1 (b))
    • The position of the anchor point is determined by the initial configuration and it is unchanged through the contact analysis iteration process.
    • In case the geometrical nonlinearity is not considered, the tangent direction is calculated from the initial configuration and it is unchanged. In case the geometrical nonlinearity is considered, users can choose the the tangent direction calculation from several options.
  • Finite slip contact (See Fig.1 (c))
    • The anchor point relocates due to the slip.
  • The possible combination of the analysis type and the contact type is shown below.

    Analysis	Bonded contact	Infinitesimal slip	Finite slip
    Linear static	Yes	Yes	Yes
    Nonlinear static	Yes	Yes	Yes
    Nonlinear dynamic	Yes	Yes	Yes
    Eigenvalue	Yes	(Note)	No
    Heat conductivity	Yes	Yes	No

  • The following comments are added to this table:
    • In the elastic static analysis, the nonlinear static analysis or the nonlinear dynamic analysis, the bonded contact, the infinitesimal slip and the finite slip can be used concurrently.
    • In the infinitesimal slip analysis and the finite slip analysis, the friction can be considered.
    • (Note) In the eigenvalue analysis, the bonded analysis can only be considered. However, in this regard, if the contact condition is that the slip is allowed but the detachment is not allowed, the infinitesimal slip can be used in the eigenvalue analysis.
    • In the heat conductivity analysis, there are two options: one is the complete heat contact condition where the temperature on the contact surfaces are assumed to be equal, the other is the heat transfer contact condition where the heat transfers on the two surfaces.

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