Three-Dimensional Crystal Plasticity Modelling of High-Strength Tool Steels Using Fourier Based Spectral Solver

2021 ◽  
Author(s):  
Youssef Ibrahim ◽  
Khaled Khafagy ◽  
Hesham Hegazi ◽  
Tarek Hatem
Keyword(s):  
Crystal Plasticity ◽  
Three Dimensional ◽  
High Strength ◽  
Tool Steels ◽  
Dimensional Crystal

Three-Dimensional Crystal Plasticity Modelling of High-Strength Tool Steels Using Fourier Based Spectral Solver

2020 ◽  
Author(s):  
Youssef Ibrahim ◽  
Khaled H. Khafagy ◽  
Tarek M. Hatem ◽  
Hesham A. Hegazi
Keyword(s):  
Tool Steel ◽  
Crystal Plasticity ◽  
High Speed ◽  
Impact Resistance ◽  
Three Dimensional ◽  
High Strength ◽  
Uniaxial Tensile ◽  
Fast Fourier Transformation ◽  
Tool Steels ◽  
Steel Alloys

Abstract Tool steels are essential for any industry, being used to cut, drill, form, shear, and shape ferrous and non-ferrous materials in bulk or powder forms. Due to the harsh service environment, tool steels are engineered with superior properties that include high wear, corrosion, and impact resistance. The macro properties of tool steel alloys are acknowledged to depend upon their fine martensitic microstructure. Therefore, accurate representation of its microstructures will help to further study its behavior which shall lead in advancing and improving their properties. In the current research, a novel microstructure generator for tool steel alloys will be used to precisely simulate complex microstructures of tool steels. The novel generating algorithm along with multiple-slip crystal plasticity based model and specialize spectral solver formulations are used to investigate high-speed tools steels behavior. The spectral method for elastoviscoplastic boundary value problems implicitly uses fast Fourier transformation algorithm (FFT) by applying periodic BCs. Both quasi-static and dynamic uniaxial tensile loading in the [010] direction is applied on a RVE of AISI H11 martensitic tool steel. Validating the numerical results with the experimental results of tool steels is presented.

scholarly journals Compressive behaviours of octet-truss lattices

2020 ◽  
Vol 234 (16) ◽  
pp. 3257-3269 ◽  
Author(s):  
Yifan Li ◽  
Huaiyuan Gu ◽  
Martyn Pavier ◽  
Harry Coules
Keyword(s):  
Failure Modes ◽  
Density Ratio ◽  
Three Dimensional ◽  
Compressive Load ◽  
High Strength ◽  
Detailed Comparison ◽  
Compressive Response ◽  
Beam Elements ◽  
Structural Applications ◽  
Octet Truss

Octet-truss lattice structures can be used for lightweight structural applications due to their high strength-to-density ratio. In this research, octet-truss lattice specimens were fabricated by stereolithography additive manufacturing with a photopolymer resin. The mechanical properties of this structure have been examined in three orthogonal orientations under the compressive load. Detailed comparison and description were carried out on deformation mechanisms and failure modes in different lattice orientations. Finite element models using both beam elements and three-dimensional solid elements were used to simulate the compressive response of this structure. Both the load reaction and collapse modes obtained in simulations were compared with test results. Our results indicate that three-dimensional continuum element models are required to accurately capture the behaviour of real trusses, taking into account the effects of finite-sized beams and joints.

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