ABAQUS-based wood constitutive relation numerical simulation method

A technology of constitutive relationship and numerical simulation, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the inconsistency of wood stress, cannot describe the ideal plastic hardening of wood along the grain and the plastic hardening of the transverse grain at the same time, cannot Accurately describe problems such as plastic deformation and brittle failure of wood

Active Publication Date: 2018-07-06
DALIAN UNIV OF TECH
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Problems solved by technology

At present, among the material constitutives embedded in ABAQUS, only the Hill yield criterion is used for compressive plastic deformation of orthotropic materials, but this constitutive model cannot simultaneously describe the ideal plastic hardening along the grain and the plastic hardening across the grain.
[0004] In addition, although the progressive damage and failure model embedded in ABAQUS can describe the brittle failure under tension and shear, it will cause simultaneous failure along the grain and across the grain, which is inconsistent with the real stress of wood
To sum up, in the current ABAQUS software, the embedded material constitutive cannot accurately describe the plastic deformation of wood under compression in different directions and the brittle failure of tension and shear.

Method used

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  • ABAQUS-based wood constitutive relation numerical simulation method
  • ABAQUS-based wood constitutive relation numerical simulation method
  • ABAQUS-based wood constitutive relation numerical simulation method

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Embodiment Construction

[0064] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0065] 1. Elastic stage constitutive equation

[0066] The stress-strain relationship of orthotropic materials in the elastic stage is shown in Equation (1):

[0067] σ=Dε (1)

[0068] Where: σ is the stress matrix, ε is the strain matrix, and D is the stiffness matrix.

[0069] The expanded expression is as formula (2):

[0070]

[0071] In the formula, D 11 =E 1 (1-v 23 v 32 )γ,D 22 =E 2 (1-ν 13 v 31 )γ,D 33 =E 3 (1-v 21 v 12 )γ,D 12 =E 1 (v 21 +v 23 v 31 )γ,D 13 =E 1 (v 21 +v 23 v 31 )γ,D 23 =E 2 (v 32 +v 12 v 31 )γ,D 44 =G 12 ,D 55 =G 23 ,D 66 =G 13 , γ=(1-v 21 v 12 -v 23 v 32 -v 13 v 31 -2v 21 v 32 v 13 ) -1 .

[0072] E. 1 ,E 2 ,E 3 Respectively, the elastic modulus in the three directions of L, R and T; G 12 , G 13 , G 23 are the shear moduli in ...

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Abstract

The invention provides an ABAQUS-based wood constitutive relation numerical simulation method, and belongs to the technical field of wood constitutive research. The simulation method can accurately describe the wood orthotropy through an embedded self-defined wood constitutive subprogram VUMAT, and predict the wood failure mode under the complex stress state.

Description

technical field [0001] The invention belongs to the technical field of wood constitutive research and provides a numerical simulation method for the stress-strain relationship of wood in a complex stress state. Background technique [0002] Wood is an anisotropic material, its complex constitutive mainly manifests as plastic deformation under compression, and brittle failure under tension and shear, and the tensile and compressive strengths are not equal in all directions. In the design of wood structures, except for very few cases (such as uniaxial tension, compression or shear), the force of wood members is complex, and a model that can accurately describe the anisotropic constitutive relationship of wood is limited to wood structures. An important part of the metamodel. [0003] In finite element analysis, wood can often be simplified as an orthotropic material. At present, among the material constitutives embedded in ABAQUS, only the Hill yield criterion is used for co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/06
Inventor 徐博瀚周双龙
Owner DALIAN UNIV OF TECH
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