Numerical Simulation Of Hydrogen-induced Deformation Behavior In The Particle Reinforced Metal Matrix Composites

Hydrogen is the smallest and lightest atom in nature,and it is widely found in nature.Hydrogen presents in the environment can go inside the material through processes such as physisorption,chemisorption,dissolution or diffusion on the surface of the material.As the smallest atom,hydrogen will rapidly diffuse in the material once it goes inside the material;at the same time,hydrogen will be trapped or segregated by various defects in the material,which will not only significantly affect the plastic deformation behavior of the material,but also significantly affects the fracture strength of the material,resulting in premature hydrogen embrittlement fracture of the material.Although the hydrogen-induced material failure phenomenon exists extensively in engineering,the understanding and quantitative description of its intrinsic physical mechanism is still not quite clearly.It involves the intersection of materials science and solid mechanics and is a typical multi-scale,multi-field coupling scientific problem.Particle reinforced metal matrix composites are advanced composite materials with excellent properties and are increasingly used in engineering.The excellent performance of the material comes from the effective cooperation of the particle phase and the matrix phase,and the interfacial strength between the particle and the matrix is the key to control its performance.Once in the particle-reinforced metal matrix composites,hydrogen segregates at the grain-matrix interface and significantly reduces the interfacial adhesion performance,leading to a decrease in the overall performance of the particulate composite.Therefore,the study of hydrogen diffusion in particle-reinforced metal matrix composites and the distribution of hydrogen near the interface have important theoretical significance and potential engineering application value for characterizing the mechanical properties and interface cracking behavior of particle-reinforced metal matrix composites.The main tasks of this article are:1.Hydrogen diffusion-stress field coupling algorithm has been derived and been realized in ABAQUS software.The diffusion of hydrogen is not only related to the concentration of hydrogen,but also related to the distribution of the hydrostatic stress field,involving the coupling of the hydrogen concentration field and the stress-strain field.For this purpose,firstly,the mechanical behaviors of the metal matrix and particles are calculated by the UMAT subroutine of ABAQUS;then,based on the similarity of the hydrogen diffusion equation and the heat conduction equation,the hydrogen concentration distribution is calculated by the UMQAT subroutine of ABAQUS using the thermal comparison method.Through the secondary development,a coupling solution between stress,strain field and hydrogen diffusion is realized under the framework of ABAQUS.2.Through hydrogen diffusion-stress field coupling calculation simulation,the influence of such as particle volume fraction and particle orientation on the distribution of hydrogen in the metal matrix was studied.Two situations have been mainly considered: hydrogen does not affect the mechanical behavior of the matrix material and hydrogen affects the mechanical behavior of the matrix material.Through comparative analysis,the effect of the meso-structure characteristics such as particle volume fraction and particle orientation on the distribution of hydrogen in the matrix and the effect of the particles on the macroscopic and micromechanical behavior of the metal matrix composites were studied.The results obtained in this paper have a certain reference value for a better understanding of the hydrogen induced deformation behavior and the failure mechanism of particle reinforced metal matrix composites.