Due to the release by the rarefaction wave from the rear of copper impactor , and with the measurement of the velocity at the interface of sample and window , the release path was detected 利用来自飞片后界面稀疏波对被测样品卸载,测量了样品窗口界面的粒子速度剖面,得到了无氧铜的卸载路径。
Lagrange wave speed in the release process was computed from the measurement , and result shows a good agreement with the data in literature . furthermore from the lagrange wave speed , the stress - strain relationship in the release process was calculated using the impedance match solution . comparison of the stress - strain with the fluid elastic - plastic model indicates that ofhc copper exhibits a clear work - harden behavior during the release 根据界面粒子速度剖面,计算得到了卸载过程中lagrange声速随界面粒子速度变化的关系,所得结果与文献给出的数据符合很好;其次,利用阻抗匹配近似,计算分析了无氧铜卸载过程的应力-应变关系,并与流体弹塑性模型进行了比较,结果表明:无氧铜的卸载过程存在明显的应变硬化效应。
Spectral method and spectral element method are both used in the present dns . the flow is developed from an initial velocity field whose mean and root mean square values are fitted to the experimental data . the reynolds number of the flow is 2250 based on the mean velocity and the radius of the pipe 本文在空间离散上采用谱方法和谱元法的结合,通过在圆管层流速度剖面上叠加随机扰动作为初始场的方法,计算了管长为,平均雷诺数为2250的光滑圆管内的湍流流动,建立了圆管内较低雷诺数下速度场和压力场的数据库。
The resonant three - wave model and laminar - turbulent velocity profile composed are used as a model of coherent structures in . turbulent flow . the forming and variation of turbulent coherent structures in the channel are simulated by the compact differential method with high accuracy and resolution derived in this paper 以共振三波和层-湍复合速度剖面作为湍流相干结构模型,采用文中所导出的高精度、高分辨率的紧致差分方法,模拟了槽道流动在近壁区域湍流相干结构的形成和变化。