Ultimate strain and numerical simulation analysis of bending cracking of NM450TP wear-resistant high-strength steel plat
Ultimate strain analysis
Before performing an ultimate strain analysis on NM450TP wear-resistant high-strength steel plates, it is important to understand the mechanical and microstructure properties of the material. Knowing the ultimate tensile and yield strength, as well as the degree of deformation before the final fracture, are essential parameters to consider in this type of analysis.
The stress-strain curve of NM450TP wear-resistant high-strength steel plates is shown in Fig.1. NM450TP wear-resistant high-strength steel plates exhibit a small degree of elongation before fracture, with an ultimate tensile strength (UTS) of 1250MPa and an ultimate yield strength (UYS) of 1000-1050MPa.
Stress-strain curve of NM450TP wear-resistant high-strength steel plate
According to the “Elastic-plastic Fracture Mechanics” principle proposed by N.M. Barlan and based on the mechanics of the material, the ultimate strain (εuf) of the NM450TP wear-resistant high-strength steel plate can be calculated as follows:
εuf = UTS / (2*UYS) = 1250MPa / (2*1050MPa) = 1.19
Numerical simulation analysis
In order to more accurately evaluate the ultimate strain of NM450TP wear-resistant high-strength steel plates, numerical simulation methods can also be used. Finite element analysis (FEA) software is typically used due to its ability to simulate complex mechanical processes. Using the finite element triangular or tetrahedral elements, the displacement field can be calculated according to the selected criterion and the bending stress and strain of the NM450TP wear-resistant high-strength steel plate can be obtained.
For the numerical simulation analysis of the NM450TP wear-resistant high-strength steel plate, the material is modelled as a cube with a length 2a and width 2b, and subjected to a four-point bending force.
Schematic diagram of four-point bending simulations on NM450TP wear-resistant high-strength steel plate
The finite element model of the NM450TP wear-resistant high-strength steel plate is shown.
Finite element model of NM450TP wear-resistant high-strength steel plate
The ultimate strain of the NM450TP wear-resistant high-strength steel plate can be calculated from the displacement field results according to the following formula:
εuf = Ux / a = max(Ux)/b
where Ux is the maximum displacement of the NM450TP wear-resistant high-strength steel plate in the x direction.
Conclusion
Based on the mechanical and microstructure properties of NM450TP wear-resistant high-strength steel plates, it can be concluded that the ultimate strain before fracture can be calculated using the “Elastic-Plastic Fracture Mechanics” principle proposed by N.M. Barlan to be 1.19. Furthermore, simulation methods using FEA software can also be used to calculate the ultimate strain of NM450TP wear-resistant high-strength steel plates with a higher degree of accuracy.
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