Multiscale Numerical Simulation Based on Cohesive Zone Model and Experimental Verification of Coupling Compound Crack Propagation
SHENG Ying1,2, JIA Bin2,3,*, WANG Ruheng1,2, CHEN Guoping1,2
1 Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang 621000, Sichuan, China 2 School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621000, Sichuan, China 3 Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang 621000, Sichuan, China
Abstract: The damage and failure mechanisms of materials under external loads are vital scientific challenges, which contain coupling and correlation of multiple scales, such as macro and micro scales as well as time and space scales. Taking α-Ti as example, microstructure and phase structure of α-Ti were first analyzed by microscopic observation. Subsequently, the size, shape and distribution of grains were randomly sampled by the Monte Carlo method, and the microstructural characteristics were obtained. By comparing with the strength determined by employing the macro experiments as well as using the image processing methods, the quantitative microstructural properties were acquired, along with revealing the influence of microstructure on the macro and micro properties of the material. The microstructural characteristics obtained microscopically provided reliable evidence for the micro scale molecular dynamics simulation. Secondly, the molecular dynamics analyses of the three α-Ti models with compounding micro defects were conducted, and the quantitative relationship between the interfacial bonding force and the relative separation displacement of the upper and lower surfaces (T-S curve) were obtained. The microscopic information related to the evolution of the crack tip, such as dislocation emission and motion, crack tip blunting, crack deflection, void initiation and growth, twinning, etc., is contained in the T-S curve. By combining the atomic configuration corresponding to the turning point of the T-S curve, the principle and mechanism of propagation of the micro-scale defects at atomic scale in α-Ti were ascertained. Finally, the multiscale method based on the atomic-based cohesive zone model for combining the macroscopic and microscopic scales was employed to simulate the crack propagation in the CT specimen under uniaxial tensile load, and the influence of micro defects on the fracture parameters was subsequently studied.
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2022, Vol. 36 
