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In this setting, the two contacting geometries can carry shear stresses up to a certain magnitude across their interface before they start sliding relative to each other. Weak springs are added to the assembly to help stabilize the model in order to achieve a reasonable solution. The model should be well constrained when using this contact setting.

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A zero coefficient of friction is assumed, thus allowing free sliding. This solution is nonlinear because the area of contact may change as the load is applied. Thus gaps can form in the model between bodies depending on the loading. This setting models standard unilateral contact that is, normal pressure equals zero if separation occurs. Slide is possible, but the nodes in contact are bonded to the target surface in normal direction. No separation contact: Once the contact is detected, then the target and contact surface are tied up for the rest of the analysis. If contact is determined on the mathematical model, any gaps will be closed and any initial penetration will be ignored. This type of contact allows for a linear solution since the contact length/area will not change during the application of the load. If contact regions are bonded, then no sliding or separation between faces or edges is allowed. The contact points on the red body are allowed to penetrate into the volume of the blue body.This is the default configuration and applies to all contact regions (surfaces, solids, lines, faces, edges).

With this approach the nodes on the interfacing bodies are allowed to interpenetrate. One way to address the issue of chattering is by introducing the concept of contact penetration. In other words the model does not converge to a solution. This type of contact can sometimes result in a situation which is called “ chattering” – A contact continues to cycle between open and closed states and the solver is unable to settle on a final contact state resulting from the applied loads and boundary conditions. A contact point is either open (not in contact) or closed (in contact). With the Normal Lagrange method, the contact status is a step function.

The two types of methods differ in how the contact interaction (between the contact and target surfaces) is treated mathematically. To answer this question we have to understand that there are two categories of contacts within ANSYS: 1) Normal Lagrange and 2) Penalty Based (Pure Penalty and Augmented Lagrange). The penetration message is an informational message. By context, we imply other messages that may have appeared, and the behavior of the solver – for example difficulty in converging to a solution indicated by load step bisections. In addition, sometimes the solver output displays messages which aren’t necessarily a cause for concern but could prove useful in multiple ways, especially when viewed in context. A warning message is something which might be a red flag and is displayed to prompt the user to check certain aspects of the model for properness and accuracy. Some of these are labelled as warning messages (such as contact status abruptly changing), while others are labelled as error messages (solution failed to converge).Īs the labels suggest, an error message usually (but not always) is followed by the termination of the solution. This message is informational but is neither an error message nor a warning message.ĪNSYS solver displays a variety of messages during the solution process. In this post we will discuss some aspects regarding contact penetration. Some people get confused as to reason and purpose of this message. Messages regarding contact penetration such as the one shown above are often seen during ANSYS structural simulations. “ There is too much penetration 594 contact points of the 3D contact elements“.