材料科学
气动加热
晶界
变形(气象学)
复合材料
晶界滑移
位错
极限抗拉强度
分子动力学
打滑(空气动力学)
机械
冶金
热力学
传热
微观结构
物理
计算化学
化学
作者
Zhihui Li,Chenchen Lu,Aiqiang Shi,Sihan Zhao,Bingxian Ou,Ning Wei
标识
DOI:10.3390/ijms232214437
摘要
It is a macro-micro model study for defect initiation, growth and crack propagation of metallic truss structure under high engine temperature and pressure conditions during the reentry atmosphere. Till now, the multi-scale simulation methods for these processes are still unclear. We explore the deformation and failure processes from macroscale to nanoscale using the Gas-Kinetic Unified Algorithm (GKUA) and all-atomic, molecular dynamic (MD) simulation method. The behaviors of the dislocations, defect evolution and crack propagation until failure for Aluminum-Magnesium (Al-Mg) alloy are considered with the different temperature background and strain fields. The results of distributions of temperature and strain field in the aerodynamic environment obtained by molecular dynamics simulations are in good agreement with those obtained from the macroscopic Boltzmann method. Compared to the tensile loading, the alloy structure is more sensitive to compression loading. The polycrystalline Al-Mg alloy has higher yield strength with a larger grain size. It is due to the translation of plastic deformation mode from grain boundary (GB) sliding to dislocation slip and the accumulation of dislocation line. Our findings have paved a new way to analyze and predict the metallic structural failure by micro-scale analysis under the aerodynamic thermal extreme environment of the reentry spacecraft on service expiration.
科研通智能强力驱动
Strongly Powered by AbleSci AI