Methods and systems using a numerical model to describe polymeric material properties

A polymer material and material performance technology, applied in design optimization/simulation, CAD numerical modeling, electrical digital data processing, etc., can solve the problem that numerical simulation will not be effective or accurate

Inactive Publication Date: 2011-11-23
LIVERMORE SOFTWARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no material model that can fully describe all properties of polymeric materials under large or nonlinear deformation conditions
Numerical simulations will not be efficient or accurate without such a material model

Method used

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  • Methods and systems using a numerical model to describe polymeric material properties
  • Methods and systems using a numerical model to describe polymeric material properties
  • Methods and systems using a numerical model to describe polymeric material properties

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Embodiment Construction

[0015] When a material is subjected to external loads, it undergoes stress and strain relaxation. Figure 1A and Figure 1B These relaxation behaviors are shown schematically. exist Figure 1A In , when a constant stress 110 is applied, the strain increases along a path 112 and gradually approaches the steady-state strain ε*114. When the applied stress is removed at 116 , the strain then returns to its original value along decay path 118 . exist Figure 1B In , when a constant strain 120 is applied, the stress follows a decay path 122 to a steady state value. This relaxation behavior is typically modeled by including viscous elements in the normal elastic model. Viscoelastic models, such as Maxwell model and Voigt model, have been proposed to simulate the behavior of polymer materials under mechanical loading. However, the Maxwell model can accurately describe the stress decay with time, as Figure 1B , but fails to accurately predict the creep response of the material un...

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Abstract

Methods and systems using a numerical model to describe polymeric material properties are disclosed. FEM model of a product is defined. FEM model includes one or more solid elements of polymeric material. In a time-marching simulation of the product under loads, stress state of the solid elements is calculated from deformation gradient tensors. Stress state incorporates the Mullins effect and strain hardening effect, also includes elastic stress, viscoelastic stress and back stress. A yield surface is defined to determine whether the elements are under plastic deformation. Plastic strain is obtained to update the deformation gradient tensor, which is then used to recalculate the stress state. Calculations continue until updated stress state is within a tolerance of the yield surface, at which time the results of polymeric material elements are obtained. The numerical model takes into account all characteristics of a polymeric material.

Description

technical field [0001] The present invention relates to computer-aided mechanical engineering analysis, and more particularly to methods and systems for simulating polymeric materials that undergo deformation, including viscoelastic, viscoplastic, and nonlinear softening. Background technique [0002] Products made of polymer materials are used almost everywhere in our daily life. Unlike polycrystalline materials, such as metals, whose molecules have an ordered lattice structure, polymeric materials, such as plastics, synthetic rubber, polystyrene, silicone, etc., are composed of long chains of monomer molecules interwoven in random directions made. When subjected to mechanical loads, the mechanical properties of polymeric materials differ significantly from those of lattice-structured materials. [0003] When analyzing polycrystalline materials, because of their relatively uniform molecular structure, Hooke's law can be used to describe the deformation of the material, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2217/16G06F17/5018G06F30/23G06F2111/10
Inventor 托比亚斯·奥尔森
Owner LIVERMORE SOFTWARE TECH
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