Abstract
In this paper, a finite element model for the particle-impact target is established for the abrasion erosion failure behavior of 20# steel used in natural gas gathering pipelines. The JC plastic model and failure criterion are used in the model to simulate the failure and damage of the material, and the reliability of the model was verified by comparison with experimental data. The dynamic behavior of particle erosion was studied by using this model. The changes of energy, stress, and morphology at the microscopic level were analyzed. The influence of particle shape, particle size, impact velocity, and impact angle on the erosion rate of 20# steel was obtained. The model is further used to study the influence mechanism of stress interference on erosion damage behavior under multiparticle random drop impact.
Highlights
Based on the understanding of the microstructure and mechanical properties of 20# steel, which is commonly used in gas gathering pipelines in southwest China, the failure rules of 20# steel under particle impact were studied by using the finite element method, providing theoretical support for the prediction of the erosion rule of natural gas gathering pipeline components
The Johnson–Cook plastic model is adopted, which can accurately predict the plastic deformation of the impacted target under high strain rate. e equivalent stress depends on the equivalent strain εp, equivalent strain rate ε_, and temperature, and the expression is as follows: σ
Equivalent diameter of 120 μm, density of 2600 kg/m3, and impact speed of 15 m/s and the impact angles are 15°, 30°, 45°, 60°, 75°, and 90°, respectively, in the target material 20# steel; the whole analysis step time is 2 × 10−6 s
Summary
E Johnson–Cook failure criterion is derived from the accumulative damage method of equivalent plastic strain based on the element integral point, which takes into account stress triaxiality, strain rate, and temperature effect. E initial spacing between particles, initial impact angle, and velocity are all equal to ensure continuous impact on the same position of the target to obtain a stable erosion rate. In order to compare with the experiment, the tetrakaidecahedron particle material in the finite element impact model is SiC with the equivalent diameter of 120 μm, and the target material is Ti-6Al-4V. Surface, so the experimental results will significantly be smaller than the simulation results
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