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详细内容

Design of cast steel nodes

1Analysis software

*****************************************************************************,******************************************************************************,***********************handling very large and complex problems and simulating highly nonlinear problems. In nonlinear analysis, ABAQUS can automatically select the corresponding load increment and convergence limit. It can not only select appropriate parameters, but also continuously adjust parameters to ensure accurate solutions are effectively obtained during the analysis process.

Basic Overview of Nodes

Basic properties of cast steel node materials

2Basic properties of cast steel node materials

The material shall comply with the relevant provisions of G20Mn5QT in the Technical Specification for Application of Cast Steel Nodes, and its chemical composition and mechanical properties shall comply with the provisions in the table below:

 

After quenching and tempering heat treatment, the mechanical properties of the steel castings should meet the requirements in the table below:

Cast steel grade

At room temperature

Impact energy value

the name of a   shop

Material

yield strengthRpo.2(MPa)

tensile strengthRm(MPa)

elongationA(%)

temperature()

Impact energyJ≥

G20Mn5QT

1.6220

300

500650

≥22

room temperature-40

60

27

Material constitutive relationship

The plastic constitutive relationship of materials in ABAQUS requires input of true stress plastic strain data, and the conversion formula is as follows:

The correlation between nominal strain and real strain

1715849351228.png 

The correlation between nominal stress and true stress

1715849329960.png 

Plastic strain:

1715849297063.png 

The true stress-strain curve obtained from the above conversion formula

The elastic modulus of G20Mn5QT steel is 2.06 × 105N/mm ², The Poisson's ratio is 0.3, and the true stress-strain curve of G20Mn5QT input in ABAQUS is as follows.

Plastic StrainXE-3mm

 

True stress-strain curve of G20Mn5QT steel

Finite element analysis of 3 cast steel nodes

3Node Overview

31 Node Overview

This node is located at the intersection of two directional inverted triangular trusses and plays an important role in overall safety. It is a multi rod connection node with complex boundaries and forces, requiring finite element analysis.

 1715849204665.png

32 Elastic Analysis Results

33Stress cloud map

34 Deformation cloud map


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