摘要
为解决大型泡沫铝元件实体冲击试验成本较高,数值模拟计算量大的问题,基于相似理论按尺寸比3∶1建立三种(圆台、四棱台及六棱台型)泡沫铝元件大、小模型,应用量纲分析法推导对应模型冲击吸能量的相似比,并进行有限元仿真及小模型实体冲击试验。结果表明,冲击试验吸能量与其有限元仿真结果误差较小,验证了有限元仿真对泡沫铝轴向冲击过程的可行性。三种元件大、小模型的有限元仿真吸能量比值分别为26.51,27.18,26.73,与依量纲分析法所得吸能量相似比27∶1相近,表明可基于相似理论对泡沫铝元件轴向冲击过程的吸能特性进行分析。
To solve the problems that the large aluminum foam element entity impact test cost is higher and the numerical simulation computation is larger,based on the similarity theory,the large and small models for three types,including a frustum of cone type,four trustum of a pyramid type and six trustum of a pyramid type of aluminum foam elements were respectively established at the geometry size ratio of 3 ∶ 1,the energy absorption similarity ratio in the impact process of large and small models were deduced via dimensional analysis. Finite element simulation via large and small models were proceeded and the entity impact tests of small models were applied. The results show that the energy absorption of small models between the entity tests and the finite element method results has little errors,verifying that LS-DYNA finite element method is feasible in axial impact process of aluminum foam. The energy absorption ratios between the large and small models in finite element simulation are respectively of 26.51,27.18,26.73,in accordance with the ratio 27∶1 derived from the dimensional analysis,the results show that it’s feasible to analyze the energy absorption characteristic of foam aluminum components under the axial impact condition based on similarity theory.
出处
《机械科学与技术》
CSCD
北大核心
2017年第10期1542-1549,共8页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51374120)资助
关键词
泡沫铝
相似理论
有限元仿真
冲击试验
吸能特性
aluminum foam
similarity theory
finite element emulation
impact test
characteristic of energy absorption
