中国科学院大学学报2024，Vol.41Issue(1)：50-64,15.DOI:10.7523/j.ucas.2022.045
利用有限元热应力计算方法对热事件月震成因的探讨
Cause of thermal event moonquakes by thermos-elastic stress finite element models
摘要
Abstract
On the basis of the previous work,considering the solar heat absorbed by the lunar surface inward and the lunar thermal radiation heat released outward,as well as the nonlinearities of the thermodynamic parameters of the lunar soil related to the temperature and depth,we have developed a thermo-elastic coupled finite element parallel program suitable for the study of the temporal and spatial evolutions of the temperature,deformation,and thermal stress of the lunar soil,and have utilized the four sets of finite element models to investigate the effects of the characteristic thicknesses of the lunar soil on the temporal and spatial evolutions of the temperature,deformation and thermal stresses of the lunar surface.The computational results show that the temperature of the lunar surface varies periodically over one lunar day(29.5 Earth days),and the temperature of the equatorial lunar surface varies from 100 to 385 K,with the variation decaying exponentially with the increase of the depth,and the depth of influence reaches to about 50 cm.The temperature cyclic changes also cause the vertical displacement of the lunar surface to rise and fall,and the horizontal normal stress of the lunar surface in the form of compression and tension.In general,the horizontal stresses are compressed during the day and tensile during the night,with the fastest increase in tensile stress at 18:00 and the highest tensile stress at 06:00.The characteristic thickness of the lunar soil has a strong influence on the temporal and spatial distributions of the temperature and the horizontal positive stresses.The magnitude of thermal stresses may reach the tensile strength of the lunar surface.The fastest growth of tensile stress and the period of maximum amplitude coincide with the observed high frequency of thermal events on the lunar surface in the morning and evening.关键词
月球/月壤/热弹耦合/热事件/热月震Key words
moon/lunar soil/thermoelastic coupling/thermal event/thermal moonquake分类
天文与地球科学引用本文复制引用
张君策,胡才博,石耀霖..利用有限元热应力计算方法对热事件月震成因的探讨[J].中国科学院大学学报,2024,41(1):50-64,15.基金项目
国家自然科学基金(41774106,42074117)和中央高校基本科研业务费专项资金(E1E40413X2)资助 （41774106,42074117）
