NUMERICAL MODEL FOR RUBBER-LIKE MATERIALS SUITABLE FOR COMPUTER-AIDED ENGINEERING ANALYSIS

摘要

PROBLEM TO BE SOLVED: To provide systems and methods for creating a numerical model for a rubber-like material including Mullins effect based on test data obtained in a bi-axial tension test of a specimen of the rubber-like material of interest.SOLUTION: On the basis of inflating-pressure versus displacement-at-the-pole data, a first set of constants of the Mooney-Rivlin constitutive equation used as a strain-energy density function is determined in a loading phase. A second set of numerical constants in an unloading-phase damage function is determined. The unloading-phase damage function is used for modifying the strain-energy density function in the unloading phase and contains a hyperbolic tangent function with dimensionless operands that include a peak strain-energy value that occurred immediately before the unloading phase. A third set of constants in a subsequent reloading-phase damage function is determined. The subsequent reloading-phase damage function is used for modifying the strain-energy density function in the reloading phase.