OS-E: 0165 Contact Smoothing With Two Concentric Rings

Contact smoothing is useful to increase accuracy of the contact solution. An enforced displacement to push two concentric rings toward each other to engage the contact is used. The usage of NLOUT entry allows you to study the progression of SPC force over successive increments.

Figure 1. FE Model


Model Files

Before you begin, copy the file(s) used in this example to your working directory.

Model Description

Conduct a Large Displacement Nonlinear Analysis solution with contact smoothing. Enforced displacement is applied on the center of the RBE2 and the inner ring is pushed on to the outer ring. The outer surface of the outer ring is constrained in translation (Figure 1).
FE Model
Elements Types
CHEXA
CPENTA
The linear material properties are:
MAT1
Young’s Modulus
2.1E+5
Poisson's Ratio
0.3
Large Displacement Nonlinear Static Analysis
NLSTAT
LGDISP
Nonlinear Parameters
NLPARM
NLOUT
NLADAPT

Results

The SPCFORCE results are shown in Figure 2(a) Smoothing is Active; (b) Smoothing is Inactive, for both cases, with and without smoothing.
Note: The activation of contact smoothing improves the SPC Force results.
SPC force output plot shows a smoother curve with contact smoothing turned On.
Figure 2. (a) Smoothing is Active; (b) Smoothing is Inactive