Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Numerical simulation method of wood constitutive relation based on abaqus

A constitutive relation and numerical simulation technology, applied in the field of wood constitutive research, it can solve the problem of not being able to describe the ideal plasticity and transverse grain plastic hardening of wood at the same time, the inconsistency of wood stress, and the inability to accurately describe the plastic deformation and brittle failure of wood, etc. question

Active Publication Date: 2020-06-16
DALIAN UNIV OF TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Numerical simulation method of wood constitutive relation based on abaqus
  • Numerical simulation method of wood constitutive relation based on abaqus
  • Numerical simulation method of wood constitutive relation based on abaqus

Examples

Experimental program
Comparison scheme
Effect test

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F111/10G06F119/14
CPCG06F30/23G06F2119/06
Inventor 徐博瀚周双龙
Owner DALIAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com