Investigation of the capabilities of yield functions on describing the deformation behavior of 5754O aluminum alloy sheet under combined loading paths

The combined loading tests of 5754O aluminum alloy sheet are used to verify the yield function. Three yield functions are implemented into the commercial finite element model (FEM) code ABAQUS as a user material subroutine UMAT for the FEM simulation of the combined loading tests. The comparison of the simulating and experimental results shows that the modified Yld2000-2d yield function can describe the mechanical behavior of 5754O aluminum alloy sheet under combined loading paths reasonably while other three yield functions do not. The performance of the modified Yld2000-2d yield function on describing the mechanical behavior under combined loading paths is analyzed in detail. It is concluded that the modified Yld2000-2d yield function can be adopted to describe the deformation behavior of 5754O aluminum alloy sheet for industrial applications.     

运营期高速公路软土路基沉降观测与预测

针对运营期高速公路软土路基的沉降观测问题,精心布设观测点,在外业观测上采取了"六固定",其观测精度达到了二等水准精度;在数据分析和预测中,应用GM(1,1)模型进行了沉降预测和精度检验,效果良好.     

宇石物流甩挂运输试点效果明显

4月12目,趁沃尔玛华东配送中心装货的空隙,浙江宇石国际物流有限公司(以下简称宇石物流)的集装箱牵引车头先从嘉兴桐乡将巨石集团的工业品挂车送到了乍浦,放下挂车,把其他公司的挂车拉回桐乡,再将沃尔玛华东配送中     

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通过分析图论中的网络概念,引入地理空间中描述和表达基于网络的地理坐标而产生的地理网络的特点,研究了公交线网的特点,提出了以虚拟形式的逻辑网络表示公交线路网,结合长沙公交路网示例进行了分析,结果表明其方法是可行的。