Dynamic Mechanical Properties of EPS Concrete Under Impact Loading

The finite element method(FEM) models of expanded polystyrene(EPS) concrete were established to study the relationships among dynamic damage, energy absorption and efficiency of buffering materials with varied flexible aggregate contents and impact speeds based on the existing split Hopkinson pressure bar(SHPB)experiments. Applied material indexes including damage degrees, crack rates and energy absorption capacities,and the dynamic responses of EPS concrete under impact loading were investigated. The results show that the failure types of these materials evolve from quasi-brittle destruction to flow-plastic destruction, the damage degree of EPS concrete increases with the enhancement of flexible aggregate content, and the peak of crack rate exists around the extreme point of shock velocities. The energy-absorption efficiency of EPS concrete increases nonlinearly when the EPS beads increase and the shock speed enhances, respectively.     

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我是武汉市汽车运输公司汉口二站198号车的司机,从1956年6月开始开汽车的,1957年4月开始节油,1958年全年平均每百车公里耗油量为16.81公升,全年节油1980公升,今年4月份每百公里平均用油13.37公升。6月份平均每百公里耗油量下降到11.45公升,第二季度共节油695公升。从这以后,很多同志都认为我有经验。其实,我没     

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亲爱的全国公路交通职工、兄弟企业的公路交通职工、兽力车、人力车运输合作社社员、人民公社从事公路交通的社员同志们!我们一百多人是来自全国各地公路交通战线上的职工。在我们中间,有各个方面的先进集体代表和先进生产者。有连续六个月达到车吨月产万吨公里的汽车队,有实现“一网五化”建成了短途运输网的县,有装卸货物每吨不超过一分钟的装卸队,有晴雨通车、全路绿化的养路道班,有大修不过天、“二保”不过时的汽车保修     

地铁车辆DCU牵引控制单元测试装置

根据广州地铁一号线车辆DCU牵引控制单元检修、测试、培训等方面的需求,提出一种新的解决方案,并且利用广州地铁现有的备件和技术力量,成功实现方案所要求的测试装置。