CAJ | 학술논문

为建立合理的月壤有限元模型用于着陆器着陆冲击动力学仿真分析,在对已知月壤的相关力学特性参数和试验数据进行分析推理的基础上,推断出月壤屈服面在低围压条件下可能会呈现出剪切膨胀特性,而在高围压条件下则可能会呈现出塑性压缩和应变硬化特性,因此定性地选择帽盖德鲁克-普拉格（Cap Drucker-Prager,CDP）模型作为月壤本构模型。模型的参数通过月壤或模拟月壤的试验数据定量地标定。对着陆器地面着陆冲击试验进行有限元建模和仿真分析,仿真结果表明：模型参数的标定方法是合理可行的;CDP模型可以准确模拟月壤在着陆冲击载荷下的动力学响应,可用于着陆冲击动力学仿真月壤有限元建模。对月壤模型参数进行了参数分析,并评估了月壤模型参数对着陆器着陆冲击性能的影响。
위건립합리적월양유한원모형용우착륙기착륙충격동역학방진분석,재대이지월양적상관역학특성삼수화시험수거진행분석추리적기출상,추단출월양굴복면재저위압조건하가능회정현출전절팽창특성,이재고위압조건하칙가능회정현출소성압축화응변경화특성,인차정성지선택모개덕로극-보랍격（Cap Drucker-Prager,CDP）모형작위월양본구모형。모형적삼수통과월양혹모의월양적시험수거정량지표정。대착륙기지면착륙충격시험진행유한원건모화방진분석,방진결과표명：모형삼수적표정방법시합리가행적;CDP모형가이준학모의월양재착륙충격재하하적동역학향응,가용우착륙충격동역학방진월양유한원건모。대월양모형삼수진행료삼수분석,병평고료월양모형삼수대착륙기착륙충격성능적영향。
The purpose of this study is to construct finite element model of lunar soil for landing impact simulation of lunar lander.Based on the analysis of the known mechanical properties and tri-axial test data of lunar soil sample,it is found that lunar soil may exhibit shear-induced dilation at low confining pressure and plastic compression and strain hardening at high confining pressure.Cap Drucker-Prager（CDP） model is selected as the constitutive model of lunar soil according to the previous qualitative analysis,and the model parameters are calibrated quantitatively by test data of lunar soil or lunar soil stimulants.Finite element modeling and simulation analysis of lunar lander landing impact tests are conducted,the results indicate that calibration methods of model parameters are practical and reasonable.Dynamic response behaviors of lunar soil under landing impact condition can be accurately simulated by CDP model,and the model can be used for lunar soil finite element modeling.Parameters analysis of lunar soil model is conducted,and effects of parameters of lunar soil model on the landing performances of lunar lander are evaluated.