Material interactive interface numerical simulation method considering nonlinearity and strain rate effect

Abstract

The present invention relates to a material interaction interface numerical simulation method considering nonlinearity and strain rate effect. The material interaction interface numerical simulation method considering nonlinearity and strain rate effect comprises the following steps of: establishing a constitutive relation model of tangential bonding-sliding and normal opening / compression nonlinearity of a material interaction interface under the action of a quasi-static load; quantifying the reinforcement effect of the strain rate effect and strain rate nonlinearity on the quasi-static constitutive relation model in the tangent direction and normal direction of the material interactive interface; defining the influence of the plastic damage effect on the tangential and normal constitutiverelation of the material interaction interface; establishing the failure judgment criterion of the material interaction interface in the hybrid mode; and defining a cohesive unit for the numerical simulation of the material interaction interface according to the material interaction interface constitutive relationship formed in the previous step based on LS-DYNA user-defined material module. Thematerial interaction interface numerical simulation method considering nonlinearity and strain rate effect can comprehensively and accurately describe the mechanical properties of the material interaction interface in the first and second modes, and reflects the dynamic performance of the material interaction interface under the strain rate effect and the nonlinearity and the influence of the plastic damage effect on the material interaction interface performance.

Description

technical field [0001] The invention relates to the application and research field of numerical simulation of material interaction interface, in particular to a numerical simulation method of material interaction interface considering nonlinear and strain rate effects. Background technique [0002] Two materials are bonded together to bear force together, and coordinated deformation is very common in many fields such as material science, especially the combination of light-weight and high-strength new materials and traditional materials. The interface properties such as the bond strength of the material interaction interface are often the basis for the joint stress and coordinated deformation of two materials. Therefore, it is of great significance to study the bond performance of the material interaction interface. The finite element method is often used to analyze and study related problems involving the complex bonding properties of the material interaction interface. The...

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Problems solved by technology

The tangential and normal constitutive relations of the material model *MAT_COHESIVE_PAPER have an exponential softening section, but this material model cannot consider the strengthening effect of the strain rate effect on the constitutive relation

Material model *MAT_COHESIVE_MIXED_MODE_ELASTOPLASTIC_RATE is currently the only material model that can consider the strain rate effect and is directly used in Cohesive units. However, this material model defines the constitutive relationship as multi-segment linear in the tangential and normal directions, which cannot reflect the tangential direction of the material interaction interface. And the nonlinear performance of the normal constitutive relationship; and this model defines the natural logarithm of the equivalent strain rate and DIF (Dynamic Increasing Factor, DIF for short, dynamic amplification factor) as a linear relationship, and cannot consider the influence of nonlinear effects

At present, in the material model directly used in Cohesive unit in LS-DYNA, there is a lack of constitutive relations that consider both the nonlinearity of material interaction interface performance and the nonlinearity of strain rate and strain rate.

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