VM-WB-MECH-078

VM-WB-MECH-078
Gasket Material Under Uniaxial Compression Loading-3-D Analysis

Overview

Reference:

Any Nonlinear Material Verification Text

Solver(s):

Ansys Mechanical

Analysis Type(s):

Static Analysis (ANTYPE=0)

Element Type(s):

3-D Structural Solid Elements

3-D Gasket Elements

Test Case

A thin interface layer of thickness t is defined between two blocks of length and width l placed on top of each other. The blocks are constrained on the left and bottom and back faces. The blocks are loaded with pressure P on the top face. Determine the pressure-closure response for gasket elements.

Material Properties

Geometric Properties

E = 1.04728 x 10⁶ Pa

ν = 0.21

L = 1 m

T = 0.02 m

P1 = 44006400 Pa

P2 = 157147000 Pa

Analysis

A 3-D analysis is performed first using a mesh of 4 x 4 gasket elements. In order to simulate the loading-unloading behavior of gasket material, the model is first loaded with a pressure P1 and unloaded and then loaded with a pressure P2 and unloaded. The pressure-closure responses simulated are compared to the material definition. Because of convergence issues, the model could not be unloaded to 0 Pa and was instead unloaded to 100 Pa.

Results Comparison

	Target	Mechanical	Error (%)
Gasket Pressure and Closure at End of 1st Loading:
GK-PRES	-4.4006 x 10⁷ Pa	-4.4006 x 10⁷ Pa	0
GK-CLOS	-4.064 x 10^-4 m	-4.064 x 10^-4 m	0
Gasket Pressure and Closure at End of 2nd Loading:
GK-PRES	-1.5715 x 10⁸ Pa	-1.5715 x 10⁸ Pa	0
GK-CLOS	-6.8327 x 10^-4 m	-6.8327 x 10^-4 m	0