Based upon the experimental behavior of porous sand under squeezing, two types of status are defined to character the process: the filling of interval space, and the yielding slippage among sands.
提出颗粒型砂介质在压实过程中的两种特征：孔隙填充状态和颗粒滑动状态；
The pilot study was done on the filling shape of liquid metal in lost foam process with dry sand by using rapid photography method and contact time method.
采用高速摄影法和电极触点法，对干砂消失模铸造金属液的充填形态进行了初步研究。
The article based on the research and analysis causing ineffective and low-effective, and conducted the process of second sand filling fracturing.
在研究分析低效及无效原因的基础上，研究出二次加砂压裂工艺。
应用推荐